Merge pull request #1 from eugenp/master

sync with origin

.gitmodules

@@ -1,3 +0,0 @@
-[submodule "testgitrepo"]
-	path = testgitrepo
-	url = /home/prd/Development/projects/idea/tutorials/spring-boot/src/main/resources/testgitrepo/

JGit/pom.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.baeldung</groupId>
     <artifactId>JGitSnippets</artifactId>
@@ -45,7 +46,6 @@
     </dependencies>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <org.eclipse.jgit.version>4.5.0.201609210915-r</org.eclipse.jgit.version>
     </properties>
 

Twitter4J/pom.xml

@@ -1,6 +1,7 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
     <modelVersion>4.0.0</modelVersion>
+
     <groupId>com.mabsisa</groupId>
     <artifactId>Twitter4J</artifactId>
     <packaging>jar</packaging>
@@ -14,17 +15,11 @@
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
-    <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-        <java.version>1.8</java.version>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>org.twitter4j</groupId>
             <artifactId>twitter4j-stream</artifactId>
-            <version>4.0.6</version>
+            <version>${twitter4j-stream.version}</version>
         </dependency>
     </dependencies>
 
@@ -49,4 +44,8 @@
         </plugins>
     </build>
 
+    <properties>
+        <twitter4j-stream.version>4.0.6</twitter4j-stream.version>
+    </properties>
+
 </project>

activejdbc/pom.xml

@@ -15,12 +15,6 @@
     </parent>
 
     <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.javalite</groupId>
             <artifactId>activejdbc</artifactId>
@@ -133,10 +127,8 @@
     </pluginRepositories>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <activejdbc.version>1.4.13</activejdbc.version>
         <environments>development.test,development</environments>
-        <org.slf4j.version>1.7.9</org.slf4j.version>
         <mysql.connector.version>5.1.34</mysql.connector.version>
     </properties>
 

algorithms/README.md

@@ -5,7 +5,6 @@
 - [Ant Colony Optimization](http://www.baeldung.com/java-ant-colony-optimization)
 - [Validating Input With Finite Automata in Java](http://www.baeldung.com/java-finite-automata)
 - [Introduction to Jenetics Library](http://www.baeldung.com/jenetics)
-- [Check If a Number Is Prime in Java](http://www.baeldung.com/java-prime-numbers)
 - [Example of Hill Climbing Algorithm](http://www.baeldung.com/java-hill-climbing-algorithm)
 - [Monte Carlo Tree Search for Tic-Tac-Toe Game](http://www.baeldung.com/java-monte-carlo-tree-search)
 - [String Search Algorithms for Large Texts](http://www.baeldung.com/java-full-text-search-algorithms)
@@ -21,4 +20,6 @@
 - [Create a Sudoku Solver in Java](http://www.baeldung.com/java-sudoku)
 - [Displaying Money Amounts in Words](http://www.baeldung.com/java-money-into-words)
 - [A Collaborative Filtering Recommendation System in Java](http://www.baeldung.com/java-collaborative-filtering-recommendations)
-- [Find All Pairs of Numbers in an Array That Add Up to a Given Sum](http://www.baeldung.com/java-algorithm-number-pairs-sum)
+- [Converting Between Roman and Arabic Numerals in Java](http://www.baeldung.com/java-convert-roman-arabic)
+- [Practical Java Examples of the Big O Notation](http://www.baeldung.com/java-algorithm-complexity)
+- [Find the Middle Element of a Linked List](http://www.baeldung.com/java-linked-list-middle-element)

algorithms/pom.xml

@@ -79,7 +79,6 @@
     </reporting>
 
     <properties>
-        <exec-maven-plugin.version>1.5.0</exec-maven-plugin.version>
         <lombok.version>1.16.12</lombok.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <tradukisto.version>1.0.1</tradukisto.version>

algorithms/src/main/java/com/baeldung/algorithms/RunAlgorithm.java

@@ -6,7 +6,6 @@ import com.baeldung.algorithms.ga.annealing.SimulatedAnnealing;
 import com.baeldung.algorithms.ga.ant_colony.AntColonyOptimization;
 import com.baeldung.algorithms.ga.binary.SimpleGeneticAlgorithm;
 import com.baeldung.algorithms.slope_one.SlopeOne;
-import com.baeldung.algorithms.pairsaddupnumber.FindPairs;
 
 public class RunAlgorithm {
 
@@ -39,12 +38,6 @@ public class RunAlgorithm {
 		case 5:
 			System.out.println("Please run the DijkstraAlgorithmTest.");
 			break;
-		case 6:
-			final FindPairs findPairs = new FindPairs();
-			final int[] input = {1, 4, 3, 2, 1, 4, 4, 3, 3};
-			final int sum = 6;
-			findPairs.execute(input, sum);
-			break;
 		default:
 			System.out.println("Unknown option");
 			break;

algorithms/src/main/java/com/baeldung/algorithms/mcts/montecarlo/MonteCarloTreeSearch.java

@@ -10,7 +10,7 @@ public class MonteCarloTreeSearch {
 
     private static final int WIN_SCORE = 10;
     private int level;
-    private int oponent;
+    private int opponent;
 
     public MonteCarloTreeSearch() {
         this.level = 3;
@@ -32,11 +32,11 @@ public class MonteCarloTreeSearch {
         long start = System.currentTimeMillis();
         long end = start + 60 * getMillisForCurrentLevel();
 
-        oponent = 3 - playerNo;
+        opponent = 3 - playerNo;
         Tree tree = new Tree();
         Node rootNode = tree.getRoot();
         rootNode.getState().setBoard(board);
-        rootNode.getState().setPlayerNo(oponent);
+        rootNode.getState().setPlayerNo(opponent);
 
         while (System.currentTimeMillis() < end) {
             // Phase 1 - Selection
@@ -93,7 +93,7 @@ public class MonteCarloTreeSearch {
         State tempState = tempNode.getState();
         int boardStatus = tempState.getBoard().checkStatus();
 
-        if (boardStatus == oponent) {
+        if (boardStatus == opponent) {
             tempNode.getParent().getState().setWinScore(Integer.MIN_VALUE);
             return boardStatus;
         }

algorithms/src/main/java/com/baeldung/algorithms/prime/PrimeGenerator.java

@@ -1,59 +0,0 @@
-package com.baeldung.algorithms.prime;
-
-import java.util.Arrays;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.stream.Collectors;
-import java.util.stream.IntStream;
-
-public class PrimeGenerator {
-    public static List<Integer> sieveOfEratosthenes(int n) {
-        final boolean prime[] = new boolean[n + 1];
-        Arrays.fill(prime, true);
-
-        for (int p = 2; p * p <= n; p++) {
-            if (prime[p]) {
-                for (int i = p * 2; i <= n; i += p)
-                    prime[i] = false;
-            }
-        }
-
-        final List<Integer> primes = new LinkedList<>();
-        for (int i = 2; i <= n; i++) {
-            if (prime[i])
-                primes.add(i);
-        }
-        return primes;
-    }
-
-    public static List<Integer> primeNumbersBruteForce(int max) {
-        final List<Integer> primeNumbers = new LinkedList<Integer>();
-        for (int i = 2; i <= max; i++) {
-            if (isPrimeBruteForce(i)) {
-                primeNumbers.add(i);
-            }
-        }
-        return primeNumbers;
-    }
-
-    private static boolean isPrimeBruteForce(int x) {
-        for (int i = 2; i < x; i++) {
-            if (x % i == 0) {
-                return false;
-            }
-        }
-        return true;
-    }
-
-    public static List<Integer> primeNumbersTill(int max) {
-        return IntStream.rangeClosed(2, max)
-            .filter(x -> isPrime(x))
-            .boxed()
-            .collect(Collectors.toList());
-    }
-
-    private static boolean isPrime(int x) {
-        return IntStream.rangeClosed(2, (int) (Math.sqrt(x)))
-            .allMatch(n -> x % n != 0);
-    }
-}

algorithms/src/main/java/com/baeldung/algorithms/romannumerals/RomanArabicConverter.java

@@ -0,0 +1,52 @@
+package com.baeldung.algorithms.romannumerals;
+
+import java.util.List;
+
+class RomanArabicConverter {
+
+    public static int romanToArabic(String input) {
+        String romanNumeral = input.toUpperCase();
+        int result = 0;
+        
+        List<RomanNumeral> romanNumerals = RomanNumeral.getReverseSortedValues();
+
+        int i = 0;
+
+        while ((romanNumeral.length() > 0) && (i < romanNumerals.size())) {
+            RomanNumeral symbol = romanNumerals.get(i);
+            if (romanNumeral.startsWith(symbol.name())) {
+                result += symbol.getValue();
+                romanNumeral = romanNumeral.substring(symbol.name().length());
+            } else {
+                i++;
+            }
+        }
+        if (romanNumeral.length() > 0) {
+            throw new IllegalArgumentException(input + " cannot be converted to a Roman Numeral");
+        }
+
+        return result;
+    }
+
+    public static String arabicToRoman(int number) {
+        if ((number <= 0) || (number > 4000)) {
+            throw new IllegalArgumentException(number + " is not in range (0,4000]");
+        }
+
+        List<RomanNumeral> romanNumerals = RomanNumeral.getReverseSortedValues();
+
+        int i = 0;
+        StringBuilder sb = new StringBuilder();
+
+        while (number > 0 && i < romanNumerals.size()) {
+            RomanNumeral currentSymbol = romanNumerals.get(i);
+            if (currentSymbol.getValue() <= number) {
+                sb.append(currentSymbol.name());
+                number -= currentSymbol.getValue();
+            } else {
+                i++;
+            }
+        }
+        return sb.toString();
+    }
+}

algorithms/src/main/java/com/baeldung/algorithms/romannumerals/RomanNumeral.java

@@ -0,0 +1,26 @@
+package com.baeldung.algorithms.romannumerals;
+
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.List;
+import java.util.stream.Collectors;
+
+enum RomanNumeral {
+    I(1), IV(4), V(5), IX(9), X(10), XL(40), L(50), XC(90), C(100), CD(400), D(500), CM(900), M(1000);
+
+    private int value;
+
+    RomanNumeral(int value) {
+        this.value = value;
+    }
+
+    public int getValue() {
+        return value;
+    }
+    
+    public static List<RomanNumeral> getReverseSortedValues() {
+        return Arrays.stream(values())
+          .sorted(Comparator.comparing((RomanNumeral e) -> e.value).reversed())
+          .collect(Collectors.toList());
+    }
+}

algorithms/src/test/java/com/baeldung/algorithms/prime/PrimeGeneratorUnitTest.java

@@ -1,28 +0,0 @@
-package com.baeldung.algorithms.prime;
-
-import static com.baeldung.algorithms.prime.PrimeGenerator.*;
-
-import java.util.Arrays;
-import java.util.List;
-import org.junit.Test;
-import static org.junit.Assert.*;
-
-public class PrimeGeneratorUnitTest {
-    @Test
-    public void whenBruteForced_returnsSuccessfully() {
-        final List<Integer> primeNumbers = primeNumbersBruteForce(20);
-        assertEquals(Arrays.asList(new Integer[] { 2, 3, 5, 7, 11, 13, 17, 19 }), primeNumbers);
-    }
-
-    @Test
-    public void whenOptimized_returnsSuccessfully() {
-        final List<Integer> primeNumbers = primeNumbersTill(20);
-        assertEquals(Arrays.asList(new Integer[] { 2, 3, 5, 7, 11, 13, 17, 19 }), primeNumbers);
-    }
-
-    @Test
-    public void whenSieveOfEratosthenes_returnsSuccessfully() {
-        final List<Integer> primeNumbers = sieveOfEratosthenes(20);
-        assertEquals(Arrays.asList(new Integer[] { 2, 3, 5, 7, 11, 13, 17, 19 }), primeNumbers);
-    }
-}

algorithms/src/test/java/com/baeldung/algorithms/romannumerals/RomanArabicConverterUnitTest.java

@@ -0,0 +1,29 @@
+package com.baeldung.algorithms.romannumerals;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.Test;
+
+public class RomanArabicConverterUnitTest {
+
+    @Test
+    public void given2018Roman_WhenConvertingToArabic_ThenReturn2018() {
+
+        String roman2018 = "MMXVIII";
+
+        int result = RomanArabicConverter.romanToArabic(roman2018);
+
+        assertThat(result).isEqualTo(2018);
+    }
+
+    @Test
+    public void given1999Arabic_WhenConvertingToRoman_ThenReturnMCMXCIX() {
+
+        int arabic1999 = 1999;
+
+        String result = RomanArabicConverter.arabicToRoman(arabic1999);
+
+        assertThat(result).isEqualTo("MCMXCIX");
+    }
+
+}

animal-sniffer-mvn-plugin/pom.xml

@@ -14,15 +14,6 @@
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
-    <dependencies>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
-
     <build>
         <plugins>
             <plugin>

annotations/annotation-processing/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xmlns="http://maven.apache.org/POM/4.0.0"
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <artifactId>annotation-processing</artifactId>

antlr/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles: 
+
+- [Java with ANTLR](http://www.baeldung.com/java-antlr)

antlr/pom.xml

@@ -0,0 +1,58 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>antlr</artifactId>
+    <name>antlr</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-modules</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.antlr</groupId>
+                <artifactId>antlr4-maven-plugin</artifactId>
+                <version>${antlr.version}</version>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>antlr4</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>build-helper-maven-plugin</artifactId>
+                <version>${mojo.version}</version>
+                <executions>
+                    <execution>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>add-source</goal>
+                        </goals>
+                        <configuration>
+                            <sources>
+                                <source>${basedir}/target/generated-sources/antlr4</source>
+                            </sources>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+    <dependencies>
+        <dependency>
+            <groupId>org.antlr</groupId>
+            <artifactId>antlr4-runtime</artifactId>
+            <version>${antlr.version}</version>
+        </dependency>
+    </dependencies>
+    <properties>
+        <antlr.version>4.7.1</antlr.version>
+        <mojo.version>3.0.0</mojo.version>
+    </properties>
+</project>

antlr/src/main/antlr4/com/baeldung/antlr/Log.g4

@@ -0,0 +1,16 @@
+grammar Log;
+
+log : entry+;
+entry : timestamp ' ' level ' ' message CRLF;
+timestamp : DATE ' ' TIME;
+level : 'ERROR' | 'INFO' | 'DEBUG';
+message : (TEXT | ' ')+;
+
+fragment DIGIT : [0-9];
+fragment TWODIGIT : DIGIT DIGIT;
+fragment LETTER : [A-Za-z];
+
+DATE : TWODIGIT TWODIGIT '-' LETTER LETTER LETTER '-' TWODIGIT;
+TIME : TWODIGIT ':' TWODIGIT ':' TWODIGIT;
+TEXT : LETTER+;
+CRLF : '\r'? '\n' | '\r';

antlr/src/main/java/com/baeldung/antlr/java/UppercaseMethodListener.java

@@ -0,0 +1,28 @@
+package com.baeldung.antlr.java;
+
+import com.baeldung.antlr.Java8BaseListener;
+import com.baeldung.antlr.Java8Parser;
+import org.antlr.v4.runtime.tree.TerminalNode;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+public class UppercaseMethodListener extends Java8BaseListener {
+
+    private List<String> errors = new ArrayList<String>();
+
+    @Override
+    public void enterMethodDeclarator(Java8Parser.MethodDeclaratorContext ctx) {
+        TerminalNode node = ctx.Identifier();
+        String methodName = node.getText();
+
+        if (Character.isUpperCase(methodName.charAt(0))){
+            errors.add(String.format("Method %s is uppercased!", methodName));
+        }
+    }
+
+    public List<String> getErrors(){
+        return Collections.unmodifiableList(errors);
+    }
+}

antlr/src/main/java/com/baeldung/antlr/log/LogListener.java

@@ -0,0 +1,51 @@
+package com.baeldung.antlr.log;
+
+import com.baeldung.antlr.LogBaseListener;
+import com.baeldung.antlr.LogParser;
+import com.baeldung.antlr.log.model.LogLevel;
+import com.baeldung.antlr.log.model.LogEntry;
+
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Locale;
+
+public class LogListener extends LogBaseListener {
+
+    private static final DateTimeFormatter DEFAULT_DATETIME_FORMATTER
+            = DateTimeFormatter.ofPattern("yyyy-MMM-dd HH:mm:ss", Locale.ENGLISH);
+
+    private List<LogEntry> entries = new ArrayList<>();
+    private LogEntry currentLogEntry;
+
+    @Override
+    public void enterEntry(LogParser.EntryContext ctx) {
+        this.currentLogEntry = new LogEntry();
+    }
+
+    @Override
+    public void exitEntry(LogParser.EntryContext ctx) {
+        entries.add(currentLogEntry);
+    }
+
+    @Override
+    public void enterTimestamp(LogParser.TimestampContext ctx) {
+        currentLogEntry.setTimestamp(LocalDateTime.parse(ctx.getText(), DEFAULT_DATETIME_FORMATTER));
+    }
+
+    @Override
+    public void enterMessage(LogParser.MessageContext ctx) {
+        currentLogEntry.setMessage(ctx.getText());
+    }
+
+    @Override
+    public void enterLevel(LogParser.LevelContext ctx) {
+        currentLogEntry.setLevel(LogLevel.valueOf(ctx.getText()));
+    }
+
+    public List<LogEntry> getEntries() {
+        return Collections.unmodifiableList(entries);
+    }
+}

antlr/src/main/java/com/baeldung/antlr/log/model/LogEntry.java

@@ -0,0 +1,35 @@
+package com.baeldung.antlr.log.model;
+
+
+import java.time.LocalDateTime;
+
+public class LogEntry {
+
+    private LogLevel level;
+    private String message;
+    private LocalDateTime timestamp;
+
+    public LogLevel getLevel() {
+        return level;
+    }
+
+    public void setLevel(LogLevel level) {
+        this.level = level;
+    }
+
+    public String getMessage() {
+        return message;
+    }
+
+    public void setMessage(String message) {
+        this.message = message;
+    }
+
+    public LocalDateTime getTimestamp() {
+        return timestamp;
+    }
+
+    public void setTimestamp(LocalDateTime timestamp) {
+        this.timestamp = timestamp;
+    }
+}

antlr/src/main/java/com/baeldung/antlr/log/model/LogLevel.java

@@ -0,0 +1,5 @@
+package com.baeldung.antlr.log.model;
+
+public enum LogLevel {
+    DEBUG, INFO, ERROR
+}

antlr/src/test/java/com/baeldung/antlr/JavaParserUnitTest.java

@@ -0,0 +1,30 @@
+package com.baeldung.antlr;
+
+import com.baeldung.antlr.java.UppercaseMethodListener;
+import org.antlr.v4.runtime.CharStreams;
+import org.antlr.v4.runtime.CommonTokenStream;
+import org.antlr.v4.runtime.tree.ParseTree;
+import org.antlr.v4.runtime.tree.ParseTreeWalker;
+import org.junit.Test;
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+public class JavaParserUnitTest {
+
+    @Test
+    public void whenOneMethodStartsWithUpperCase_thenOneErrorReturned() throws Exception{
+
+        String javaClassContent = "public class SampleClass { void DoSomething(){} }";
+        Java8Lexer java8Lexer = new Java8Lexer(CharStreams.fromString(javaClassContent));
+        CommonTokenStream tokens = new CommonTokenStream(java8Lexer);
+        Java8Parser java8Parser = new Java8Parser(tokens);
+        ParseTree tree = java8Parser.compilationUnit();
+        ParseTreeWalker walker = new ParseTreeWalker();
+        UppercaseMethodListener uppercaseMethodListener = new UppercaseMethodListener();
+        walker.walk(uppercaseMethodListener, tree);
+
+        assertThat(uppercaseMethodListener.getErrors().size(), is(1));
+        assertThat(uppercaseMethodListener.getErrors().get(0),
+                is("Method DoSomething is uppercased!"));
+    }
+}

antlr/src/test/java/com/baeldung/antlr/LogParserUnitTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.antlr;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.hamcrest.MatcherAssert.assertThat;
+
+import com.baeldung.antlr.log.LogListener;
+import com.baeldung.antlr.log.model.LogLevel;
+import com.baeldung.antlr.log.model.LogEntry;
+import org.antlr.v4.runtime.CharStreams;
+import org.antlr.v4.runtime.CommonTokenStream;
+import org.antlr.v4.runtime.tree.ParseTreeWalker;
+import org.junit.Test;
+
+import java.time.LocalDateTime;
+
+
+public class LogParserUnitTest {
+
+    @Test
+    public void whenLogContainsOneErrorLogEntry_thenOneErrorIsReturned() throws Exception {
+        String logLines = "2018-May-05 14:20:21 DEBUG entering awesome method\r\n" +
+                "2018-May-05 14:20:24 ERROR Bad thing happened\r\n";
+        LogLexer serverLogLexer = new LogLexer(CharStreams.fromString(logLines));
+        CommonTokenStream tokens = new CommonTokenStream( serverLogLexer );
+        LogParser logParser = new LogParser(tokens);
+        ParseTreeWalker walker = new ParseTreeWalker();
+        LogListener logWalker = new LogListener();
+        walker.walk(logWalker, logParser.log());
+
+        assertThat(logWalker.getEntries().size(), is(2));
+        LogEntry error = logWalker.getEntries().get(1);
+        assertThat(error.getLevel(), is(LogLevel.ERROR));
+        assertThat(error.getMessage(), is("Bad thing happened"));
+        assertThat(error.getTimestamp(), is(LocalDateTime.of(2018,5,5,14,20,24)));
+    }
+}

apache-cayenne/pom.xml

@@ -28,12 +28,6 @@
             <scope>runtime</scope>
         </dependency>
 
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
     </dependencies>
 
     <build>
@@ -47,12 +41,8 @@
     </build>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-        <java.version>1.8</java.version>
         <mysql.connector.version>5.1.44</mysql.connector.version>
         <cayenne.version>4.0.M5</cayenne.version>
-        <junit.version>4.12</junit.version>
     </properties>
 
 </project>

apache-cxf/cxf-aegis/pom.xml

@@ -17,8 +17,4 @@
         </dependency>
     </dependencies>
 
-    <properties>
-        <cxf.version>3.1.8</cxf.version>
-    </properties>
-
 </project>

apache-cxf/cxf-introduction/pom.xml

@@ -36,9 +36,4 @@
         </plugins>
     </build>
 
-    <properties>
-        <cxf.version>3.1.8</cxf.version>
-        <surefire.version>2.19.1</surefire.version>
-    </properties>
-
 </project>

apache-cxf/cxf-jaxrs-implementation/pom.xml

@@ -48,10 +48,7 @@
     </build>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <cxf.version>3.1.8</cxf.version>
         <httpclient.version>4.5.2</httpclient.version>
-        <surefire.version>2.19.1</surefire.version>
     </properties>
 
 </project>

apache-cxf/cxf-spring/pom.xml

@@ -101,11 +101,7 @@
     </profiles>
 
     <properties>
-        <cxf.version>3.1.8</cxf.version>
         <spring.version>4.3.4.RELEASE</spring.version>
-        <javax.servlet-api.version>3.1.0</javax.servlet-api.version>
-        <maven-war-plugin.version>2.6</maven-war-plugin.version>
-        <surefire.version>2.19.1</surefire.version>
         <cargo-maven2-plugin.version>1.6.1</cargo-maven2-plugin.version>
     </properties>
 

apache-cxf/pom.xml

@@ -33,7 +33,7 @@
     </build>
 
     <properties>
-        <exec-maven-plugin.version>1.5.0</exec-maven-plugin.version>
+        <cxf.version>3.1.8</cxf.version>
     </properties>
 
 </project>

apache-meecrowave/pom.xml

@@ -0,0 +1,57 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung</groupId>
+    <artifactId>apache-meecrowave</artifactId>
+    <version>0.0.1</version>
+    <name>apache-meecrowave</name>
+    <description>A sample REST API application with Meecrowave</description>
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/org.apache.meecrowave/meecrowave-core -->
+        <dependency>
+            <groupId>org.apache.meecrowave</groupId>
+            <artifactId>meecrowave-core</artifactId>
+            <version>1.2.1</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/org.apache.meecrowave/meecrowave-jpa -->
+        <dependency>
+            <groupId>org.apache.meecrowave</groupId>
+            <artifactId>meecrowave-jpa</artifactId>
+            <version>1.2.1</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.squareup.okhttp3</groupId>
+            <artifactId>okhttp</artifactId>
+            <version>3.10.0</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.meecrowave</groupId>
+            <artifactId>meecrowave-junit</artifactId>
+            <version>1.2.0</version>
+            <scope>test</scope>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/junit/junit -->
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.10</version>
+            <scope>test</scope>
+        </dependency>
+
+    </dependencies>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.meecrowave</groupId>
+                <artifactId>meecrowave-maven-plugin</artifactId>
+                <version>1.2.1</version>
+            </plugin>
+        </plugins>
+    </build>
+</project>

apache-meecrowave/src/main/java/com/baeldung/meecrowave/Article.java

@@ -0,0 +1,30 @@
+package com.baeldung.meecrowave;
+
+public class Article {
+    private String name;
+    private String author;
+
+    public Article() {
+    }
+
+    public Article(String name, String author) {
+        this.author = author;
+        this.name = name;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+}

apache-meecrowave/src/main/java/com/baeldung/meecrowave/ArticleEndpoints.java

@@ -0,0 +1,32 @@
+package com.baeldung.meecrowave;
+
+import javax.enterprise.context.RequestScoped;
+import javax.inject.Inject;
+import javax.ws.rs.GET;
+import javax.ws.rs.POST;
+import javax.ws.rs.Path;
+import javax.ws.rs.core.Response;
+import javax.ws.rs.core.Response.Status;
+
+@RequestScoped
+@Path("article")
+public class ArticleEndpoints {
+
+    @Inject
+    ArticleService articleService;
+
+    @GET
+    public Response getArticle() {
+        return Response.ok()
+            .entity(new Article("name", "author"))
+            .build();
+
+    }
+
+    @POST
+    public Response createArticle(Article article) {
+        return Response.status(Status.CREATED)
+            .entity(articleService.createArticle(article))
+            .build();
+    }
+}

apache-meecrowave/src/main/java/com/baeldung/meecrowave/ArticleService.java

@@ -0,0 +1,10 @@
+package com.baeldung.meecrowave;
+
+import javax.enterprise.context.ApplicationScoped;
+
+@ApplicationScoped
+public class ArticleService {
+    public Article createArticle(Article article) {
+        return article;
+    }
+}

apache-meecrowave/src/main/java/com/baeldung/meecrowave/Server.java

@@ -0,0 +1,16 @@
+package com.baeldung.meecrowave;
+
+import org.apache.meecrowave.Meecrowave;
+
+public class Server {
+    public static void main(String[] args) {
+        final Meecrowave.Builder builder = new Meecrowave.Builder();
+        builder.setScanningPackageIncludes("com.baeldung.meecrowave");
+        builder.setJaxrsMapping("/api/*");
+        builder.setJsonpPrettify(true);
+
+        try (Meecrowave meecrowave = new Meecrowave(builder)) {
+            meecrowave.bake().await();
+        }
+    }
+}

apache-meecrowave/src/test/java/com/baeldung/meecrowave/ArticleEndpointsTest.java

@@ -0,0 +1,41 @@
+package com.baeldung.meecrowave;
+
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.IOException;
+
+import org.apache.meecrowave.Meecrowave;
+import org.apache.meecrowave.junit.MonoMeecrowave;
+import org.apache.meecrowave.testing.ConfigurationInject;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+
+@RunWith(MonoMeecrowave.Runner.class)
+public class ArticleEndpointsTest {
+    
+    @ConfigurationInject
+    private Meecrowave.Builder config;
+    private static OkHttpClient client;
+    
+    @BeforeClass
+    public static void setup() {
+        client = new OkHttpClient();
+    }
+    
+   @Test
+    public void whenRetunedArticle_thenCorrect() throws IOException {
+        final String base = "http://localhost:"+config.getHttpPort();
+        
+        Request request = new Request.Builder()
+          .url(base+"/article")
+          .build();
+        Response response = client.newCall(request).execute();
+        assertEquals(200,  response.code());
+    }
+}

apache-opennlp/pom.xml

@@ -24,12 +24,6 @@
             <version>${org.assertj.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
     </dependencies>
 
     <properties>

apache-shiro/pom.xml

@@ -10,7 +10,7 @@
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
-        <version>${org.springframework.boot.spring-boot-starter-parent.version}</version>
+        <version>1.5.2.RELEASE</version>
     </parent>
 
     <dependencies>
@@ -57,10 +57,10 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.7.0</version>
+                <version>${maven-compiler-plugin.version}</version>
                 <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
                 </configuration>
             </plugin>
         </plugins>
@@ -68,9 +68,10 @@
 
     <properties>
         <apache-shiro-core-version>1.4.0</apache-shiro-core-version>
+        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
+        <java.version>1.8</java.version>
         <log4j-version>1.2.17</log4j-version>
         <slf4j-version>1.7.25</slf4j-version>
-        <org.springframework.boot.spring-boot-starter-parent.version>1.5.2.RELEASE</org.springframework.boot.spring-boot-starter-parent.version>
     </properties>
 
 </project>

apache-solrj/src/test/java/com/baeldung/solrjava/SolrJavaLiveTest.java

@@ -12,7 +12,7 @@ import org.apache.solr.common.SolrDocumentList;
 import org.junit.Before;
 import org.junit.Test;
 
-public class SolrJavaIntegrationTest {
+public class SolrJavaLiveTest {
 
     private SolrJavaIntegration solrJavaIntegration;
 

apache-spark/pom.xml

@@ -21,16 +21,9 @@
             <artifactId>spark-core_2.10</artifactId>
             <version>${org.apache.spark.spark-core.version}</version>
         </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
     </dependencies>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <org.apache.spark.spark-core.version>2.2.0</org.apache.spark.spark-core.version>
     </properties>
 

apache-velocity/pom.xml

@@ -60,7 +60,6 @@
 
     <properties>
         <jstl.version>1.2</jstl.version>
-        <maven-war-plugin.version>2.6</maven-war-plugin.version>
         <org.apache.httpcomponents.version>4.5.2</org.apache.httpcomponents.version>
         <velocity-version>1.7</velocity-version>
         <velocity-tools-version>2.0</velocity-tools-version>

asm/pom.xml

@@ -54,10 +54,8 @@
     </build>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <asm.version>5.2</asm.version>
         <maven-jar-plugin.version>2.4</maven-jar-plugin.version>
-        <maven-surefire-plugin.version>2.9</maven-surefire-plugin.version>
     </properties>
 
 </project>

atomix/pom.xml

@@ -17,12 +17,6 @@
             <artifactId>atomix-all</artifactId>
             <version>${atomix-all.version}</version>
         </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>log4j</groupId>
             <artifactId>log4j</artifactId>
@@ -32,7 +26,6 @@
 
     <properties>
         <atomix-all.version>1.0.0-rc9</atomix-all.version>
-        <log4j.version>1.2.17</log4j.version>
     </properties>
 
 </project>

aws-lambda/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles: 
+- [Using AWS Lambda with API Gateway](http://www.baeldung.com/aws-lambda-api-gateway)
+- [Introduction to AWS Serverless Application Model](http://www.baeldung.com/aws-serverless)

aws-lambda/pom.xml

@@ -1,31 +1,30 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <parent>
-        <artifactId>parent-modules</artifactId>
-        <groupId>com.baeldung</groupId>
-        <version>1.0.0-SNAPSHOT</version>
-    </parent>
     <modelVersion>4.0.0</modelVersion>
-
     <groupId>com.baeldung</groupId>
     <artifactId>aws-lambda</artifactId>
     <version>0.1.0-SNAPSHOT</version>
     <packaging>jar</packaging>
     <name>aws-lambda</name>
 
+    <parent>
+        <artifactId>parent-modules</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0.0-SNAPSHOT</version>
+    </parent>
+
     <dependencies>
 
         <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-java-sdk-dynamodb</artifactId>
-            <version>1.11.241</version>
+            <version>${aws-java-sdk.version}</version>
         </dependency>
         <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-java-sdk-core</artifactId>
-            <version>1.11.241</version>
+            <version>${aws-java-sdk.version}</version>
         </dependency>
         <dependency>
             <groupId>com.amazonaws</groupId>
@@ -65,6 +64,7 @@
             <version>${json-simple.version}</version>
         </dependency>
     </dependencies>
+    
     <build>
         <plugins>
             <plugin>
@@ -85,6 +85,7 @@
             </plugin>
         </plugins>
     </build>
+    
     <properties>
         <json-simple.version>1.1.1</json-simple.version>
         <org.json.version>20180130</org.json.version>
@@ -92,8 +93,9 @@
         <aws-lambda-java-events.version>1.3.0</aws-lambda-java-events.version>
         <aws-lambda-java-core.version>1.2.0</aws-lambda-java-core.version>
         <gson.version>2.8.2</gson.version>
-        <aws-java-sdk-core.version>1.11.241</aws-java-sdk-core.version>
+        <aws-java-sdk.version>1.11.241</aws-java-sdk.version>
         <maven-shade-plugin.version>3.0.0</maven-shade-plugin.version>
         <maven-dependency-plugin.version>2.10</maven-dependency-plugin.version>
     </properties>
+    
 </project>

aws-lambda/sam-templates/template-implicit.yaml

@@ -0,0 +1,60 @@
+AWSTemplateFormatVersion: '2010-09-09'
+Transform: 'AWS::Serverless-2016-10-31'
+Description: Baeldung Serverless Application Model Example with Implicit API Definition
+Globals:
+  Api:
+    EndpointConfiguration: REGIONAL
+    Name: "TestAPI"
+Resources:
+  PersonTable:
+    Type: AWS::Serverless::SimpleTable
+    Properties:
+      PrimaryKey:
+          Name: id
+          Type: Number
+      TableName: Person
+  StorePersonFunction:
+    Type: AWS::Serverless::Function
+    Properties:
+      Handler: com.baeldung.lambda.apigateway.APIDemoHandler::handleRequest
+      Runtime: java8
+      Timeout: 15
+      MemorySize: 512
+      CodeUri: ../target/aws-lambda-0.1.0-SNAPSHOT.jar
+      Policies:
+        - DynamoDBCrudPolicy:
+            TableName: !Ref PersonTable
+      Environment:
+        Variables:
+          TABLE_NAME: !Ref PersonTable
+      Events:
+        StoreApi:
+          Type: Api
+          Properties:
+            Path: /persons
+            Method: PUT
+  GetPersonByHTTPParamFunction:
+    Type: AWS::Serverless::Function
+    Properties:
+      Handler: com.baeldung.lambda.apigateway.APIDemoHandler::handleGetByParam
+      Runtime: java8
+      Timeout: 15
+      MemorySize: 512
+      CodeUri: ../target/aws-lambda-0.1.0-SNAPSHOT.jar
+      Policies:
+        - DynamoDBReadPolicy:
+            TableName: !Ref PersonTable
+      Environment:
+        Variables:
+          TABLE_NAME: !Ref PersonTable
+      Events:
+        GetByPathApi:
+          Type: Api
+          Properties:
+            Path: /persons/{id}
+            Method: GET
+        GetByQueryApi:
+          Type: Api
+          Properties:
+            Path: /persons
+            Method: GET

aws-lambda/sam-templates/template-inline-swagger.yaml

@@ -0,0 +1,112 @@
+AWSTemplateFormatVersion: '2010-09-09'
+Transform: 'AWS::Serverless-2016-10-31'
+Description: Baeldung Serverless Application Model Example with Inline Swagger API Definition
+Resources:
+  PersonTable:
+    Type: AWS::Serverless::SimpleTable
+    Properties:
+      PrimaryKey:
+          Name: id
+          Type: Number
+      TableName: Person
+  StorePersonFunction:
+    Type: AWS::Serverless::Function
+    Properties:
+      Handler: com.baeldung.lambda.apigateway.APIDemoHandler::handleRequest
+      Runtime: java8
+      Timeout: 15
+      MemorySize: 512
+      CodeUri: ../target/aws-lambda-0.1.0-SNAPSHOT.jar
+      Policies:
+        - DynamoDBCrudPolicy:
+            TableName: !Ref PersonTable
+      Environment:
+        Variables:
+          TABLE_NAME: !Ref PersonTable
+      Events:
+        StoreApi:
+          Type: Api
+          Properties:
+            Path: /persons
+            Method: PUT
+            RestApiId:
+                Ref: MyApi
+  GetPersonByHTTPParamFunction:
+    Type: AWS::Serverless::Function
+    Properties:
+      Handler: com.baeldung.lambda.apigateway.APIDemoHandler::handleGetByParam
+      Runtime: java8
+      Timeout: 15
+      MemorySize: 512
+      CodeUri: ../target/aws-lambda-0.1.0-SNAPSHOT.jar
+      Policies:
+        - DynamoDBReadPolicy:
+            TableName: !Ref PersonTable
+      Environment:
+        Variables:
+          TABLE_NAME: !Ref PersonTable
+      Events:
+        GetByPathApi:
+          Type: Api
+          Properties:
+            Path: /persons/{id}
+            Method: GET
+            RestApiId:
+                Ref: MyApi
+        GetByQueryApi:
+          Type: Api
+          Properties:
+            Path: /persons
+            Method: GET
+            RestApiId:
+                Ref: MyApi
+  MyApi:
+    Type: AWS::Serverless::Api
+    Properties:
+      StageName: test
+      EndpointConfiguration: REGIONAL
+      DefinitionBody:
+        swagger: "2.0"
+        info:
+          title: "TestAPI"
+        paths:
+          /persons:
+            get:
+              parameters:
+              - name: "id"
+                in: "query"
+                required: true
+                type: "string"
+              x-amazon-apigateway-request-validator: "Validate query string parameters and\
+                \ headers"
+              x-amazon-apigateway-integration:
+                uri:
+                  Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${GetPersonByHTTPParamFunction.Arn}/invocations
+                responses: {}
+                httpMethod: "POST"
+                type: "aws_proxy"
+            put:
+              x-amazon-apigateway-integration:
+                uri:
+                  Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${StorePersonFunction.Arn}/invocations
+                responses: {}
+                httpMethod: "POST"
+                type: "aws_proxy"
+          /persons/{id}:
+            get:
+              parameters:
+              - name: "id"
+                in: "path"
+                required: true
+                type: "string"
+              responses: {}
+              x-amazon-apigateway-integration:
+                uri:
+                  Fn::Sub: arn:aws:apigateway:${AWS::Region}:lambda:path/2015-03-31/functions/${GetPersonByHTTPParamFunction.Arn}/invocations
+                responses: {}
+                httpMethod: "POST"
+                type: "aws_proxy"
+        x-amazon-apigateway-request-validators:
+          Validate query string parameters and headers:
+            validateRequestParameters: true
+            validateRequestBody: false

aws-lambda/src/main/java/com/baeldung/lambda/apigateway/APIDemoHandler.java

@@ -36,9 +36,7 @@ public class APIDemoHandler implements RequestStreamHandler {
 
                 dynamoDb.getTable(DYNAMODB_TABLE_NAME)
                     .putItem(new PutItemSpec().withItem(new Item().withNumber("id", person.getId())
-								.withString("firstName", person.getFirstName())
-								.withString("lastName", person.getLastName()).withNumber("age", person.getAge())
-								.withString("address", person.getAddress())));
+                        .withString("name", person.getName())));
             }
 
             JSONObject responseBody = new JSONObject();
@@ -61,8 +59,7 @@ public class APIDemoHandler implements RequestStreamHandler {
         writer.close();
     }
 
-	public void handleGetByPathParam(InputStream inputStream, OutputStream outputStream, Context context)
-			throws IOException {
+    public void handleGetByParam(InputStream inputStream, OutputStream outputStream, Context context) throws IOException {
 
         BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
         JSONObject responseJson = new JSONObject();
@@ -81,61 +78,20 @@ public class APIDemoHandler implements RequestStreamHandler {
                 if (pps.get("id") != null) {
 
                     int id = Integer.parseInt((String) pps.get("id"));
-					result = dynamoDb.getTable(DYNAMODB_TABLE_NAME).getItem("id", id);
+                    result = dynamoDb.getTable(DYNAMODB_TABLE_NAME)
+                        .getItem("id", id);
                 }
 
-			}
-			if (result != null) {
-
-				Person person = new Person(result.toJSON());
-				responseBody.put("Person", person);
-				responseJson.put("statusCode", 200);
-			} else {
-
-				responseBody.put("message", "No item found");
-				responseJson.put("statusCode", 404);
-			}
-
-			JSONObject headerJson = new JSONObject();
-			headerJson.put("x-custom-header", "my custom header value");
-
-			responseJson.put("headers", headerJson);
-			responseJson.put("body", responseBody.toString());
-
-		} catch (ParseException pex) {
-			responseJson.put("statusCode", 400);
-			responseJson.put("exception", pex);
-		}
-
-		OutputStreamWriter writer = new OutputStreamWriter(outputStream, "UTF-8");
-		writer.write(responseJson.toString());
-		writer.close();
-	}
-
-	public void handleGetByQueryParam(InputStream inputStream, OutputStream outputStream, Context context)
-			throws IOException {
-
-		BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
-		JSONObject responseJson = new JSONObject();
-
-		AmazonDynamoDB client = AmazonDynamoDBClientBuilder.defaultClient();
-		DynamoDB dynamoDb = new DynamoDB(client);
-
-		Item result = null;
-		try {
-			JSONObject event = (JSONObject) parser.parse(reader);
-			JSONObject responseBody = new JSONObject();
-
-			if (event.get("queryStringParameters") != null) {
+            } else if (event.get("queryStringParameters") != null) {
 
                 JSONObject qps = (JSONObject) event.get("queryStringParameters");
                 if (qps.get("id") != null) {
 
                     int id = Integer.parseInt((String) qps.get("id"));
-					result = dynamoDb.getTable(DYNAMODB_TABLE_NAME).getItem("id", id);
+                    result = dynamoDb.getTable(DYNAMODB_TABLE_NAME)
+                        .getItem("id", id);
                 }
             }
-
             if (result != null) {
 
                 Person person = new Person(result.toJSON());
@@ -162,5 +118,4 @@ public class APIDemoHandler implements RequestStreamHandler {
         writer.write(responseJson.toString());
         writer.close();
     }
-
 }

aws-lambda/src/main/java/com/baeldung/lambda/apigateway/model/Person.java

@@ -6,19 +6,13 @@ import com.google.gson.GsonBuilder;
 public class Person {
 
     private int id;
-	private String firstName;
-	private String lastName;
-	private int age;
-	private String address;
+    private String name;
 
     public Person(String json) {
         Gson gson = new Gson();
         Person request = gson.fromJson(json, Person.class);
         this.id = request.getId();
-		this.firstName = request.getFirstName();
-		this.lastName = request.getLastName();
-		this.age = request.getAge();
-		this.address = request.getAddress();
+        this.name = request.getName();
     }
 
     public String toString() {
@@ -34,35 +28,11 @@ public class Person {
         this.id = id;
     }
 
-	public String getFirstName() {
-		return firstName;
+    public String getName() {
+        return name;
     }
 
-	public void setFirstName(String firstName) {
-		this.firstName = firstName;
-	}
-
-	public String getLastName() {
-		return lastName;
-	}
-
-	public void setLastName(String lastName) {
-		this.lastName = lastName;
-	}
-
-	public int getAge() {
-		return age;
-	}
-
-	public void setAge(int age) {
-		this.age = age;
-	}
-
-	public String getAddress() {
-		return address;
-	}
-
-	public void setAddress(String address) {
-		this.address = address;
+    public void setName(String name) {
+        this.name = name;
     }
 }

aws/pom.xml

@@ -19,12 +19,6 @@
             <artifactId>aws-java-sdk</artifactId>
             <version>${aws-java-sdk.version}</version>
         </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
        <dependency>
             <groupId>org.mockito</groupId>
             <artifactId>mockito-core</artifactId>
@@ -143,7 +137,6 @@
         <aws-lambda-java-core.version>1.1.0</aws-lambda-java-core.version>
         <gson.version>2.8.0</gson.version>
         <aws-java-sdk.version>1.11.290</aws-java-sdk.version>
-        <junit.version>4.12</junit.version>
         <mockito-core.version>2.8.9</mockito-core.version>
         <assertj-core.version>3.8.0</assertj-core.version>
         <dynamodblocal.version>1.11.86</dynamodblocal.version>

azure/pom.xml

@@ -2,7 +2,6 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
-
     <groupId>com.baeldung</groupId>
     <artifactId>azure</artifactId>
     <version>0.1</version>
@@ -17,11 +16,6 @@
         <relativePath>../parent-boot-2</relativePath>
     </parent>
 
-    <properties>
-        <azure.containerRegistry>baeldungadr</azure.containerRegistry>
-        <docker.image.prefix>${azure.containerRegistry}.azurecr.io</docker.image.prefix>
-    </properties>
-
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
@@ -42,12 +36,13 @@
         <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
+            <scope>runtime</scope>
         </dependency>
 
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
-            <version>5.1.6</version>
+            <scope>runtime</scope>
         </dependency>
 
     </dependencies>
@@ -61,7 +56,7 @@
             <plugin>
                 <groupId>com.spotify</groupId>
                 <artifactId>docker-maven-plugin</artifactId>
-                <version>1.1.0</version>
+                <version>{docker-maven-plugin.version}</version>
                 <configuration>
                     <imageName>${docker.image.prefix}/${project.artifactId}</imageName>
                     <registryUrl>https://${docker.image.prefix}</registryUrl>
@@ -79,7 +74,7 @@
             <plugin>
                 <groupId>com.microsoft.azure</groupId>
                 <artifactId>azure-webapp-maven-plugin</artifactId>
-                <version>1.1.0</version>
+                <version>${azure-webapp-maven-plugin.version}</version>
                 <configuration>
                     <authentication>
                         <serverId>azure-auth</serverId>
@@ -87,45 +82,52 @@
                     <resourceGroup>baeldung-group</resourceGroup>
                     <appName>baeldung-webapp</appName>
                     <appServicePlanName>baeldung-plan</appServicePlanName>
-                    <javaVersion>1.8</javaVersion>
-                    <!--<javaWebContainer>tomcat 8.5</javaWebContainer>-->
-                    <!--<region>japanwest</region>-->
-                    <!--<containerSettings>-->
-                    <!--<imageName>${docker.image.prefix}/${project.artifactId}</imageName>-->
-                    <!--<registryUrl>https://${docker.image.prefix}</registryUrl>-->
-                    <!--<serverId>${azure.containerRegistry}</serverId>-->
-                    <!--</containerSettings>-->
+                    <javaVersion>{java.version}</javaVersion>
+                    <!--<javaWebContainer>tomcat 8.5</javaWebContainer> -->
+                    <!--<region>japanwest</region> -->
+                    <!--<containerSettings> -->
+                    <!--<imageName>${docker.image.prefix}/${project.artifactId}</imageName> -->
+                    <!--<registryUrl>https://${docker.image.prefix}</registryUrl> -->
+                    <!--<serverId>${azure.containerRegistry}</serverId> -->
+                    <!--</containerSettings> -->
                     <appSettings>
                         <property>
                             <name>spring.datasource.url</name>
                             <value>jdbc:h2:file:~/test</value>
-                            <!--<value>jdbc:mysql://127.0.0.1:55738/localdb</value>-->
+                            <!--<value>jdbc:mysql://127.0.0.1:55738/localdb</value> -->
                         </property>
                         <property>
                             <name>spring.datasource.username</name>
                             <value>sa</value>
-                            <!--<value>azure</value>-->
+                            <!--<value>azure</value> -->
                         </property>
                         <property>
                             <name>spring.datasource.password</name>
                             <value></value>
-                            <!--<value>replace-with-your-password</value>-->
+                            <!--<value>replace-with-your-password</value> -->
                         </property>
                     </appSettings>
-                    <!--<deploymentType>ftp</deploymentType>-->
-                    <!--<resources>-->
-                    <!--<resource>-->
-                    <!--<directory>${project.basedir}/target</directory>-->
-                    <!--<targetPath>webapps</targetPath>-->
-                    <!--<includes>-->
-                    <!--<include>*.war</include>-->
-                    <!--</includes>-->
-                    <!--</resource>-->
-                    <!--</resources>-->
+                    <!--<deploymentType>ftp</deploymentType> -->
+                    <!--<resources> -->
+                    <!--<resource> -->
+                    <!--<directory>${project.basedir}/target</directory> -->
+                    <!--<targetPath>webapps</targetPath> -->
+                    <!--<includes> -->
+                    <!--<include>*.war</include> -->
+                    <!--</includes> -->
+                    <!--</resource> -->
+                    <!--</resources> -->
                 </configuration>
             </plugin>
         </plugins>
     </build>
 
+    <properties>
+        <azure.containerRegistry>baeldungadr</azure.containerRegistry>
+        <docker.image.prefix>${azure.containerRegistry}.azurecr.io</docker.image.prefix>
+        <docker-maven-plugin.version>1.1.0</docker-maven-plugin.version>
+        <azure-webapp-maven-plugin.version>1.1.0</azure-webapp-maven-plugin.version>
+        <java.version>1.8</java.version>
+    </properties>
 
 </project>

baeldung-pmd-rules.xml

@@ -3,7 +3,7 @@
 	xsi:schemaLocation="http://pmd.sf.net/ruleset/1.0.0 http://pmd.sf.net/ruleset_xml_schema.xsd" 
 	xsi:noNamespaceSchemaLocation="http://pmd.sf.net/ruleset_xml_schema.xsd">
 	<description>Baeldung custom PMD rules</description>
-	<rule name="UnitTestMustFollowNamingConventionRule" message="Test class name doesn't follow the naming convention" class="org.baeldung.pmd.UnitTestNamingConventionRule">
+	<rule name="UnitTestMustFollowNamingConventionRule" message="Unit test class names need to end in 'UnitTest', integration tests with 'IntegrationTest', etc " class="org.baeldung.pmd.UnitTestNamingConventionRule">
 		<description>Test does not follow Baeldung naming convention</description>
 		<priority>3</priority>
 	</rule>

bootique/pom.xml

@@ -52,16 +52,21 @@
 
     <build>
         <plugins>
+
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
+                <version>${maven-shade-plugin.version}</version>
             </plugin>
+
         </plugins>
     </build>
 
     <properties>
         <main.class>com.baeldung.bootique.App</main.class>
         <bootique-bom.version>0.23</bootique-bom.version>
+
+        <maven-shade-plugin.version>2.4.3</maven-shade-plugin.version>
     </properties>
 
 </project>

camel-api/pom.xml

@@ -60,8 +60,6 @@
     </build>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
         <camel.version>2.19.1</camel.version>
         <spring-boot-starter.version>1.5.4.RELEASE</spring-boot-starter.version>
     </properties>

cas/cas-secured-app/pom.xml

@@ -13,7 +13,7 @@
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>1.5.13.RELEASE</version>
-        <relativePath/> <!-- lookup parent from repository -->
+        <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
     <dependencies>

cas/cas-server/pom.xml

@@ -1,6 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd ">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.baeldung</groupId>
@@ -31,7 +30,7 @@
             <plugin>
                 <groupId>com.rimerosolutions.maven.plugins</groupId>
                 <artifactId>wrapper-maven-plugin</artifactId>
-                <version>0.0.4</version>
+                <version>${wrapper-maven-plugin.version}</version>
                 <configuration>
                     <verifyDownload>true</verifyDownload>
                     <checksumAlgorithm>MD5</checksumAlgorithm>
@@ -58,7 +57,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-war-plugin</artifactId>
-                <version>2.6</version>
+                <version>${maven-war-plugin.version}</version>
                 <configuration>
                     <warName>cas</warName>
                     <failOnMissingWebXml>false</failOnMissingWebXml>
@@ -78,27 +77,12 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.3</version>
+                <version>${maven-compiler-plugin.version}</version>
             </plugin>
         </plugins>
         <finalName>cas</finalName>
     </build>
 
-    <properties>
-        <cas.version>5.3.0-SNAPSHOT</cas.version>
-        <springboot.version>1.5.13.RELEASE</springboot.version>
-        <!-- app.server could be -jetty, -undertow, -tomcat, or blank if you plan to provide appserver -->
-        <app.server>-tomcat</app.server>
-
-        <mainClassName>org.springframework.boot.loader.WarLauncher</mainClassName>
-        <isExecutable>false</isExecutable>
-        <manifestFileToUse>${project.build.directory}/war/work/org.apereo.cas/cas-server-webapp${app.server}/META-INF/MANIFEST.MF</manifestFileToUse>
-
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    </properties>
-
     <repositories>
         <repository>
             <id>sonatype-releases</id>
@@ -140,9 +124,7 @@
                     <type>war</type>
                     <scope>runtime</scope>
                 </dependency>
-                <!--
-                ...Additional dependencies may be placed here...
-                -->
+                <!-- ...Additional dependencies may be placed here... -->
             </dependencies>
         </profile>
 
@@ -161,7 +143,7 @@
                     <plugin>
                         <groupId>com.soebes.maven.plugins</groupId>
                         <artifactId>echo-maven-plugin</artifactId>
-                        <version>0.3.0</version>
+                        <version>${echo-maven-plugin.version}</version>
                         <executions>
                             <execution>
                                 <phase>prepare-package</phase>
@@ -210,7 +192,7 @@
                     <plugin>
                         <groupId>com.github.s4u.plugins</groupId>
                         <artifactId>pgpverify-maven-plugin</artifactId>
-                        <version>1.1.0</version>
+                        <version>${pgpverify-maven-plugin.version}</version>
                         <executions>
                             <execution>
                                 <goals>
@@ -230,4 +212,25 @@
             </build>
         </profile>
     </profiles>
+
+    <properties>
+        <cas.version>5.3.0-SNAPSHOT</cas.version>
+        <springboot.version>1.5.13.RELEASE</springboot.version>
+        <!-- app.server could be -jetty, -undertow, -tomcat, or blank if you plan to provide appserver -->
+        <app.server>-tomcat</app.server>
+
+        <mainClassName>org.springframework.boot.loader.WarLauncher</mainClassName>
+        <isExecutable>false</isExecutable>
+        <manifestFileToUse>${project.build.directory}/war/work/org.apereo.cas/cas-server-webapp${app.server}/META-INF/MANIFEST.MF</manifestFileToUse>
+
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <wrapper-maven-plugin.version>0.0.4</wrapper-maven-plugin.version>
+        <maven-war-plugin.version>2.6</maven-war-plugin.version>
+        <maven-compiler-plugin.version>3.3</maven-compiler-plugin.version>
+        <echo-maven-plugin.version>0.3.0</echo-maven-plugin.version>
+        <pgpverify-maven-plugin.version>1.1.0</pgpverify-maven-plugin.version>
+    </properties>
+
 </project>

cdi/README.md

@@ -1,2 +1,3 @@
 ### Relevant Articles:
 - [CDI Interceptor vs Spring AspectJ](http://www.baeldung.com/cdi-interceptor-vs-spring-aspectj)
+- [An Introduction to CDI (Contexts and Dependency Injection) in Java](http://www.baeldung.com/java-ee-cdi)

cdi/pom.xml

@@ -17,19 +17,19 @@
         <dependency>
             <groupId>org.hamcrest</groupId>
             <artifactId>hamcrest-core</artifactId>
-            <version>1.3</version>
+            <version>${hamcrest-core.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
-            <version>3.10.0</version>
+            <version>${assertj-core.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>${junit.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -58,6 +58,9 @@
     <properties>
         <aspectjweaver.version>1.8.9</aspectjweaver.version>
         <weld-se-core.version>2.4.1.Final</weld-se-core.version>
+        <hamcrest-core.version>1.3</hamcrest-core.version>
+        <assertj-core.version>3.10.0</assertj-core.version>
+        <junit.version>4.12</junit.version>
     </properties>
 
 </project>

checker-plugin/pom.xml

@@ -66,8 +66,8 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>${maven-compiler-plugin.version}</version>
                 <configuration>
-                    <source>${maven.compiler.source}</source>
-                    <target>${maven.compiler.target}</target>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
                     <!-- Uncomment the following line to use the type annotations compiler. -->
                     <!-- <fork>true</fork> -->
                     <compilerArguments>
@@ -113,8 +113,6 @@
         <checker.version>2.3.1</checker.version>
         <jdk8.version>2.3.1</jdk8.version>
         <checkerframework.compiler.version>2.3.1</checkerframework.compiler.version>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
     </properties>
 
 </project>

core-groovy/pom.xml

@@ -101,24 +101,13 @@
     </repositories>
 
     <properties>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <kotlin-maven-plugin.version>1.1.2</kotlin-maven-plugin.version>
-        <kotlin-test-junit.version>1.1.2</kotlin-test-junit.version>
-        <kotlin-stdlib.version>1.1.2</kotlin-stdlib.version>
-        <kotlin-reflect.version>1.1.2</kotlin-reflect.version>
-        <kotlinx.version>0.15</kotlinx.version>
-        <mockito-kotlin.version>1.5.0</mockito-kotlin.version>
-        <junit.jupiter.version>5.0.0</junit.jupiter.version>
         <junit.platform.version>1.0.0</junit.platform.version>
-        <junit.vintage.version>4.12.0</junit.vintage.version>
-        <junit4.version>4.12</junit4.version>
         <groovy.version>2.4.13</groovy.version>
         <groovy-all.version>2.4.13</groovy-all.version>
         <groovy-sql.version>2.4.13</groovy-sql.version>
         <hsqldb.version>2.4.0</hsqldb.version>
         <spock-core.version>1.1-groovy-2.4</spock-core.version>
         <gmavenplus-plugin.version>1.6</gmavenplus-plugin.version>
-        <maven-failsafe-plugin.version>2.19.1</maven-failsafe-plugin.version>
     </properties>
 </project>
 

core-java-10/pom.xml

@@ -14,15 +14,6 @@
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
-	<dependencies>
-		<dependency>
-			<groupId>junit</groupId>
-			<artifactId>junit</artifactId>
-			<version>${junit.version}</version>
-			<scope>test</scope>
-		</dependency>
-	</dependencies>
-
     <build>
         <plugins>
             <plugin>

core-java-11/pom.xml

@@ -14,15 +14,6 @@
         <version>1.0.0-SNAPSHOT</version>
     </parent>
 
-	<dependencies>
-		<dependency>
-			<groupId>junit</groupId>
-			<artifactId>junit</artifactId>
-			<version>${junit.version}</version>
-			<scope>test</scope>
-		</dependency>
-	</dependencies>
-
     <build>
         <plugins>
             <plugin>

core-java-8/README.md

@@ -32,7 +32,6 @@
 - [“Stream has already been operated upon or closed” Exception in Java](http://www.baeldung.com/java-stream-operated-upon-or-closed-exception)
 - [Display All Time Zones With GMT And UTC in Java](http://www.baeldung.com/java-time-zones)
 - [Copy a File with Java](http://www.baeldung.com/java-copy-file)
-- [Generating Prime Numbers in Java](http://www.baeldung.com/java-generate-prime-numbers)
 - [Static and Default Methods in Interfaces in Java](http://www.baeldung.com/java-static-default-methods)
 - [Iterable to Stream in Java](http://www.baeldung.com/java-iterable-to-stream)
 - [Converting String to Stream of chars](http://www.baeldung.com/java-string-to-stream)
@@ -54,3 +53,5 @@
 - [An Introduction to Java.util.Hashtable Class](http://www.baeldung.com/java-hash-table)
 - [Method Parameter Reflection in Java](http://www.baeldung.com/java-parameter-reflection)
 - [Java 8 Unsigned Arithmetic Support](http://www.baeldung.com/java-unsigned-arithmetic)
+- [How to Get the Start and the End of a Day using Java](http://www.baeldung.com/java-day-start-end)
+- [Generalized Target-Type Inference in Java](http://www.baeldung.com/java-generalized-target-type-inference)

core-java-8/pom.xml

@@ -94,6 +94,11 @@
             <artifactId>streamex</artifactId>
             <version>${streamex.version}</version>
         </dependency>
+        <dependency>
+            <groupId>joda-time</groupId>
+            <artifactId>joda-time</artifactId>
+            <version>${joda.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
@@ -123,78 +128,6 @@
                 </executions>
             </plugin>
 
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-jar-plugin</artifactId>
-                <configuration>
-                    <archive>
-                        <manifest>
-                            <addClasspath>true</addClasspath>
-                            <classpathPrefix>libs/</classpathPrefix>
-                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                        </manifest>
-                    </archive>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-assembly-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>single</goal>
-                        </goals>
-                        <configuration>
-                            <archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
-                            <archive>
-                                <manifest>
-                                    <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                                </manifest>
-                            </archive>
-                            <descriptorRefs>
-                                <descriptorRef>jar-with-dependencies</descriptorRef>
-                            </descriptorRefs>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-shade-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>shade</goal>
-                        </goals>
-                        <configuration>
-                            <shadedArtifactAttached>true</shadedArtifactAttached>
-                            <transformers>
-                                <transformer
-                                        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
-                                    <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                                </transformer>
-                            </transformers>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>com.jolira</groupId>
-                <artifactId>onejar-maven-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <configuration>
-                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                            <attachToBuild>true</attachToBuild>
-                            <filename>${project.build.finalName}-onejar.${project.packaging}</filename>
-                        </configuration>
-                        <goals>
-                            <goal>one-jar</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
@@ -225,10 +158,8 @@
 
     <properties>
         <!-- util -->
-        <guava.version>21.0</guava.version>
         <commons-lang3.version>3.5</commons-lang3.version>
         <commons-math3.version>3.6.1</commons-math3.version>
-        <commons-io.version>2.5</commons-io.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>
         <commons-codec.version>1.10</commons-codec.version>
@@ -236,6 +167,7 @@
         <vavr.version>0.9.0</vavr.version>
         <protonpack.version>1.13</protonpack.version>
         <streamex.version>0.6.5</streamex.version>
+        <joda.version>2.10</joda.version>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>
         <avaitility.version>1.7.0</avaitility.version>

core-java-8/src/main/java/com/baeldung/datetime/AddHoursToDate.java

@@ -0,0 +1,54 @@
+package com.baeldung.datetime;
+
+import java.time.Duration;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZonedDateTime;
+import java.time.temporal.ChronoUnit;
+import java.util.Calendar;
+import java.util.Date;
+
+import org.apache.commons.lang3.time.DateUtils;
+
+public class AddHoursToDate {
+
+    public Date addHoursToJavaUtilDate(Date date, int hours) {
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTime(date);
+        calendar.add(Calendar.HOUR_OF_DAY, hours);
+        return calendar.getTime();
+    }
+
+    public Date addHoursToDateUsingInstant(Date date, int hours) {
+        return Date.from(date.toInstant()
+            .plus(Duration.ofHours(hours)));
+    }
+
+    public LocalDateTime addHoursToLocalDateTime(LocalDateTime localDateTime, int hours) {
+        return localDateTime.plusHours(hours);
+    }
+
+    public LocalDateTime subtractHoursToLocalDateTime(LocalDateTime localDateTime, int hours) {
+        return localDateTime.minusHours(hours);
+    }
+
+    public ZonedDateTime addHoursToZonedDateTime(ZonedDateTime zonedDateTime, int hours) {
+        return zonedDateTime.plusHours(hours);
+    }
+
+    public ZonedDateTime subtractHoursToZonedDateTime(ZonedDateTime zonedDateTime, int hours) {
+        return zonedDateTime.minusHours(hours);
+    }
+
+    public Instant addHoursToInstant(Instant instant, int hours) {
+        return instant.plus(hours, ChronoUnit.HOURS);
+    }
+
+    public Instant subtractHoursToInstant(Instant instant, int hours) {
+        return instant.minus(hours, ChronoUnit.HOURS);
+    }
+
+    public Date addHoursWithApacheCommons(Date date, int hours) {
+        return DateUtils.addHours(date, hours);
+    }
+}

core-java-8/src/main/java/com/baeldung/datetime/UseLocalDate.java

@@ -3,6 +3,7 @@ package com.baeldung.datetime;
 import java.time.DayOfWeek;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
+import java.time.LocalTime;
 import java.time.temporal.ChronoUnit;
 import java.time.temporal.TemporalAdjusters;
 
@@ -43,4 +44,30 @@ class UseLocalDate {
         LocalDateTime startofDay = localDate.atStartOfDay();
         return startofDay;
     }
+
+    LocalDateTime getStartOfDayOfLocalDate(LocalDate localDate) {
+        LocalDateTime startofDay = LocalDateTime.of(localDate, LocalTime.MIDNIGHT);
+        return startofDay;
+    }
+
+    LocalDateTime getStartOfDayAtMinTime(LocalDate localDate) {
+        LocalDateTime startofDay = localDate.atTime(LocalTime.MIN);
+        return startofDay;
+    }
+
+    LocalDateTime getStartOfDayAtMidnightTime(LocalDate localDate) {
+        LocalDateTime startofDay = localDate.atTime(LocalTime.MIDNIGHT);
+        return startofDay;
+    }
+
+    LocalDateTime getEndOfDay(LocalDate localDate) {
+        LocalDateTime endOfDay = localDate.atTime(LocalTime.MAX);
+        return endOfDay;
+    }
+
+    LocalDateTime getEndOfDayFromLocalTime(LocalDate localDate) {
+        LocalDateTime endOfDate = LocalTime.MAX.atDate(localDate);
+        return endOfDate;
+    }
+
 }

core-java-8/src/main/java/com/baeldung/datetime/UseLocalDateTime.java

@@ -1,6 +1,8 @@
 package com.baeldung.datetime;
 
 import java.time.LocalDateTime;
+import java.time.LocalTime;
+import java.time.temporal.ChronoField;
 
 public class UseLocalDateTime {
 
@@ -8,4 +10,15 @@ public class UseLocalDateTime {
         return LocalDateTime.parse(representation);
     }
 
+    LocalDateTime getEndOfDayFromLocalDateTimeDirectly(LocalDateTime localDateTime) {
+        LocalDateTime endOfDate = localDateTime.with(ChronoField.NANO_OF_DAY, LocalTime.MAX.toNanoOfDay());
+        return endOfDate;
+    }
+
+    LocalDateTime getEndOfDayFromLocalDateTime(LocalDateTime localDateTime) {
+        LocalDateTime endOfDate = localDateTime.toLocalDate()
+            .atTime(LocalTime.MAX);
+        return endOfDate;
+    }
+
 }

core-java-8/src/main/java/com/baeldung/datetime/UseZonedDateTime.java

@@ -1,12 +1,42 @@
 package com.baeldung.datetime;
 
+import java.time.LocalDate;
 import java.time.LocalDateTime;
 import java.time.ZoneId;
 import java.time.ZonedDateTime;
+import java.time.temporal.ChronoField;
 
 class UseZonedDateTime {
 
     ZonedDateTime getZonedDateTime(LocalDateTime localDateTime, ZoneId zoneId) {
         return ZonedDateTime.of(localDateTime, zoneId);
     }
+
+    ZonedDateTime getStartOfDay(LocalDate localDate, ZoneId zone) {
+        ZonedDateTime startofDay = localDate.atStartOfDay()
+            .atZone(zone);
+        return startofDay;
+    }
+
+    ZonedDateTime getStartOfDayShorthand(LocalDate localDate, ZoneId zone) {
+        ZonedDateTime startofDay = localDate.atStartOfDay(zone);
+        return startofDay;
+    }
+
+    ZonedDateTime getStartOfDayFromZonedDateTime(ZonedDateTime zonedDateTime) {
+        ZonedDateTime startofDay = zonedDateTime.toLocalDateTime()
+            .toLocalDate()
+            .atStartOfDay(zonedDateTime.getZone());
+        return startofDay;
+    }
+
+    ZonedDateTime getStartOfDayAtMinTime(ZonedDateTime zonedDateTime) {
+        ZonedDateTime startofDay = zonedDateTime.with(ChronoField.HOUR_OF_DAY, 0);
+        return startofDay;
+    }
+
+    ZonedDateTime getStartOfDayAtMidnightTime(ZonedDateTime zonedDateTime) {
+        ZonedDateTime startofDay = zonedDateTime.with(ChronoField.NANO_OF_DAY, 0);
+        return startofDay;
+    }
 }

core-java-8/src/main/java/com/baeldung/datetime/modify/DateIncrementer.java

@@ -0,0 +1,63 @@
+package com.baeldung.datetime.modify;
+
+import org.apache.commons.lang3.time.DateUtils;
+import org.joda.time.DateTime;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.time.LocalDate;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.logging.Logger;
+
+public class DateIncrementer {
+    private static final Logger log = Logger.getLogger(DateIncrementer.class.getName());
+    private static final int INCREMENT_BY_IN_DAYS = 1;
+
+    public static String addOneDay(String date) {
+        return LocalDate
+          .parse(date)
+          .plusDays(INCREMENT_BY_IN_DAYS)
+          .toString();
+    }
+
+    public static String addOneDayJodaTime(String date) {
+        DateTime dateTime = new DateTime(date);
+        return dateTime
+          .plusDays(INCREMENT_BY_IN_DAYS)
+          .toString("yyyy-MM-dd");
+    }
+
+    public static String addOneDayCalendar(String date) throws ParseException {
+        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
+        Calendar c = Calendar.getInstance();
+        c.setTime(sdf.parse(date));
+        c.add(Calendar.DATE, 1);
+        return sdf.format(c.getTime());
+    }
+
+    public static String addOneDayApacheCommons(String date) throws ParseException {
+        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
+        Date incrementedDate = DateUtils.addDays(sdf.parse(date), 1);
+        return sdf.format(incrementedDate);
+    }
+
+    public static void main(String[] args) throws ParseException {
+        String date = LocalDate
+          .now()
+          .toString();
+        log.info("Current date = " + date);
+
+        String incrementedDateJava8 = DateIncrementer.addOneDay(date);
+        log.info("Date incremented by one day using (Java 8): " + incrementedDateJava8);
+
+        String incrementedDateJodaTime = DateIncrementer.addOneDayJodaTime(date);
+        log.info("Date incremented by one day using (Joda-Time): " + incrementedDateJodaTime);
+
+        String incrementedDateCalendar = addOneDayCalendar(date);
+        log.info("Date incremented by one day using (java.util.Calendar): " + incrementedDateCalendar);
+
+        String incrementedDateApacheCommons = addOneDayApacheCommons(date);
+        log.info("Date incremented by one day using (Apache Commons DateUtils): " + incrementedDateApacheCommons);
+    }
+}

core-java-8/src/test/java/com/baeldung/datetime/AddHoursToDateUnitTest.java

@@ -0,0 +1,116 @@
+package com.baeldung.datetime;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.Month;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.util.Calendar;
+import java.util.Date;
+import java.util.GregorianCalendar;
+
+import org.junit.Test;
+
+public class AddHoursToDateUnitTest {
+
+    private final AddHoursToDate addHoursToDateObj = new AddHoursToDate();
+
+    @Test
+    public void givenJavaUtilDate_whenPositiveHours_thenAddHours() {
+        Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
+        Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 7, 0).getTime();
+
+        assertThat(addHoursToDateObj.addHoursToJavaUtilDate(actualDate, 2)).isEqualTo(expectedDate);
+    }
+
+    @Test
+    public void givenJavaUtilDate_whenNegativeHours_thenMinusHours() {
+        Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
+        Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 3, 0).getTime();
+
+        assertThat(addHoursToDateObj.addHoursToJavaUtilDate(actualDate, -2)).isEqualTo(expectedDate);
+    }
+
+    @Test
+    public void givenJavaUtilDate_whenUsingToInstantAndPostiveHours_thenAddHours() {
+        Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
+        Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 7, 0).getTime();
+
+        assertThat(addHoursToDateObj.addHoursToDateUsingInstant(actualDate, 2)).isEqualTo(expectedDate);
+    }
+
+    @Test
+    public void givenJavaUtilDate_whenUsingToInstantAndNegativeHours_thenAddHours() {
+        Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
+        Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 3, 0).getTime();
+
+        assertThat(addHoursToDateObj.addHoursToDateUsingInstant(actualDate, -2)).isEqualTo(expectedDate);
+    }
+
+    @Test
+    public void givenLocalDateTime_whenUsingAddHoursToLocalDateTime_thenAddHours() {
+        LocalDateTime actualDateTime = LocalDateTime.of(2018, Month.JUNE, 25, 5, 0);
+        LocalDateTime expectedDateTime = LocalDateTime.of(2018, Month.JUNE, 25, 7, 0);
+
+        assertThat(addHoursToDateObj.addHoursToLocalDateTime(actualDateTime, 2)).isEqualTo(expectedDateTime);
+    }
+
+    @Test
+    public void givenLocalDateTime_whenUsingMinusHoursToLocalDateTime_thenMinusHours() {
+        LocalDateTime actualDateTime = LocalDateTime.of(2018, Month.JUNE, 25, 5, 0);
+        LocalDateTime expectedDateTime = LocalDateTime.of(2018, Month.JUNE, 25, 3, 0);
+
+        assertThat(addHoursToDateObj.subtractHoursToLocalDateTime(actualDateTime, 2)).isEqualTo(expectedDateTime);
+    }
+
+    @Test
+    public void givenZonedDateTime_whenUsingAddHoursToZonedDateTime_thenAddHours() {
+        ZonedDateTime actualZonedDateTime = ZonedDateTime.of(LocalDateTime.of(2018, Month.JUNE, 25, 5, 0), ZoneId.systemDefault());
+        ZonedDateTime expectedZonedDateTime = ZonedDateTime.of(LocalDateTime.of(2018, Month.JUNE, 25, 7, 0), ZoneId.systemDefault());
+
+        assertThat(addHoursToDateObj.addHoursToZonedDateTime(actualZonedDateTime, 2)).isEqualTo(expectedZonedDateTime);
+    }
+
+    @Test
+    public void givenZonedDateTime_whenUsingMinusHoursToZonedDateTime_thenMinusHours() {
+        ZonedDateTime actualZonedDateTime = ZonedDateTime.of(LocalDateTime.of(2018, Month.JUNE, 25, 5, 0), ZoneId.systemDefault());
+        ZonedDateTime expectedZonedDateTime = ZonedDateTime.of(LocalDateTime.of(2018, Month.JUNE, 25, 3, 0), ZoneId.systemDefault());
+
+        assertThat(addHoursToDateObj.subtractHoursToZonedDateTime(actualZonedDateTime, 2)).isEqualTo(expectedZonedDateTime);
+    }
+
+    @Test
+    public void givenJavaUtilDate_whenUsingPositiveHrsAndAddHoursWithApacheCommons_thenAddHours() {
+        Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
+        Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 7, 0).getTime();
+
+        assertThat(addHoursToDateObj.addHoursWithApacheCommons(actualDate, 2)).isEqualTo(expectedDate);
+    }
+
+    @Test
+    public void givenJavaUtilDate_whenUsingNegativeHrsAndAddHoursWithApacheCommons_thenMinusHours() {
+        Date actualDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 7, 0).getTime();
+        Date expectedDate = new GregorianCalendar(2018, Calendar.JUNE, 25, 5, 0).getTime();
+
+        assertThat(addHoursToDateObj.addHoursWithApacheCommons(actualDate, -2)).isEqualTo(expectedDate);
+    }
+
+    @Test
+    public void givenInstant_whenUsingAddHoursToInstant_thenAddHours() {
+        Instant actualValue = Instant.parse("2018-06-25T05:12:35Z");
+        Instant expectedValue = Instant.parse("2018-06-25T07:12:35Z");
+
+        assertThat(addHoursToDateObj.addHoursToInstant(actualValue, 2)).isEqualTo(expectedValue);
+    }
+
+    @Test
+    public void givenInstant_whenUsingSubtractHoursToInstant_thenMinusHours() {
+        Instant actualValue = Instant.parse("2018-06-25T07:12:35Z");
+        Instant expectedValue = Instant.parse("2018-06-25T05:12:35Z");
+
+        assertThat(addHoursToDateObj.subtractHoursToInstant(actualValue, 2)).isEqualTo(expectedValue);
+    }
+
+}

core-java-8/src/test/java/com/baeldung/datetime/UseLocalDateTimeUnitTest.java

@@ -1,13 +1,15 @@
 package com.baeldung.datetime;
 
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertEquals;
+
 import java.time.LocalDate;
+import java.time.LocalDateTime;
 import java.time.LocalTime;
 import java.time.Month;
 
 import org.junit.Test;
 
-import static org.junit.Assert.assertEquals;
-
 public class UseLocalDateTimeUnitTest {
 
     UseLocalDateTime useLocalDateTime = new UseLocalDateTime();
@@ -19,4 +21,16 @@ public class UseLocalDateTimeUnitTest {
         assertEquals(LocalTime.of(6, 30), useLocalDateTime.getLocalDateTimeUsingParseMethod("2016-05-10T06:30")
             .toLocalTime());
     }
+
+    @Test
+    public void givenLocalDateTime_whenSettingEndOfDay_thenReturnLastMomentOfDay() {
+        LocalDateTime givenTimed = LocalDateTime.parse("2018-06-23T05:55:55");
+
+        LocalDateTime endOfDayFromGivenDirectly = useLocalDateTime.getEndOfDayFromLocalDateTimeDirectly(givenTimed);
+        LocalDateTime endOfDayFromGiven = useLocalDateTime.getEndOfDayFromLocalDateTime(givenTimed);
+
+        assertThat(endOfDayFromGivenDirectly).isEqualTo(endOfDayFromGiven);
+        assertThat(endOfDayFromGivenDirectly.toLocalTime()).isEqualTo(LocalTime.MAX);
+        assertThat(endOfDayFromGivenDirectly.toString()).isEqualTo("2018-06-23T23:59:59.999999999");
+    }
 }

core-java-8/src/test/java/com/baeldung/datetime/UseLocalDateUnitTest.java

@@ -1,13 +1,15 @@
 package com.baeldung.datetime;
 
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.Assert.assertEquals;
+
 import java.time.DayOfWeek;
 import java.time.LocalDate;
 import java.time.LocalDateTime;
+import java.time.LocalTime;
 
 import org.junit.Test;
 
-import static org.junit.Assert.assertEquals;
-
 public class UseLocalDateUnitTest {
 
     UseLocalDate useLocalDate = new UseLocalDate();
@@ -57,4 +59,33 @@ public class UseLocalDateUnitTest {
         assertEquals(LocalDateTime.parse("2016-05-22T00:00:00"), useLocalDate.getStartOfDay(LocalDate.parse("2016-05-22")));
     }
 
+    @Test
+    public void givenLocalDate_whenSettingStartOfDay_thenReturnMidnightInAllCases() {
+        LocalDate given = LocalDate.parse("2018-06-23");
+
+        LocalDateTime startOfDayWithMethod = useLocalDate.getStartOfDay(given);
+        LocalDateTime startOfDayOfLocalDate = useLocalDate.getStartOfDayOfLocalDate(given);
+        LocalDateTime startOfDayWithMin = useLocalDate.getStartOfDayAtMinTime(given);
+        LocalDateTime startOfDayWithMidnight = useLocalDate.getStartOfDayAtMidnightTime(given);
+
+        assertThat(startOfDayWithMethod).isEqualTo(startOfDayWithMin)
+            .isEqualTo(startOfDayWithMidnight)
+            .isEqualTo(startOfDayOfLocalDate)
+            .isEqualTo(LocalDateTime.parse("2018-06-23T00:00:00"));
+        assertThat(startOfDayWithMin.toLocalTime()).isEqualTo(LocalTime.MIDNIGHT);
+        assertThat(startOfDayWithMin.toString()).isEqualTo("2018-06-23T00:00");
+    }
+
+    @Test
+    public void givenLocalDate_whenSettingEndOfDay_thenReturnLastMomentOfDay() {
+        LocalDate given = LocalDate.parse("2018-06-23");
+
+        LocalDateTime endOfDayWithMax = useLocalDate.getEndOfDay(given);
+        LocalDateTime endOfDayFromLocalTime = useLocalDate.getEndOfDayFromLocalTime(given);
+
+        assertThat(endOfDayWithMax).isEqualTo(endOfDayFromLocalTime);
+        assertThat(endOfDayWithMax.toLocalTime()).isEqualTo(LocalTime.MAX);
+        assertThat(endOfDayWithMax.toString()).isEqualTo("2018-06-23T23:59:59.999999999");
+    }
+
 }

core-java-8/src/test/java/com/baeldung/datetime/UseZonedDateTimeUnitTest.java

@@ -1,6 +1,10 @@
 package com.baeldung.datetime;
 
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.time.LocalDate;
 import java.time.LocalDateTime;
+import java.time.LocalTime;
 import java.time.ZoneId;
 import java.time.ZonedDateTime;
 
@@ -17,4 +21,25 @@ public class UseZonedDateTimeUnitTest {
         ZonedDateTime zonedDatetime = zonedDateTime.getZonedDateTime(LocalDateTime.parse("2016-05-20T06:30"), zoneId);
         Assert.assertEquals(zoneId, ZoneId.from(zonedDatetime));
     }
+
+    @Test
+    public void givenLocalDateOrZoned_whenSettingStartOfDay_thenReturnMidnightInAllCases() {
+        LocalDate given = LocalDate.parse("2018-06-23");
+        ZoneId zone = ZoneId.of("Europe/Paris");
+        ZonedDateTime zonedGiven = ZonedDateTime.of(given, LocalTime.NOON, zone);
+
+        ZonedDateTime startOfOfDayWithMethod = zonedDateTime.getStartOfDay(given, zone);
+        ZonedDateTime startOfOfDayWithShorthandMethod = zonedDateTime.getStartOfDayShorthand(given, zone);
+        ZonedDateTime startOfOfDayFromZonedDateTime = zonedDateTime.getStartOfDayFromZonedDateTime(zonedGiven);
+        ZonedDateTime startOfOfDayAtMinTime = zonedDateTime.getStartOfDayAtMinTime(zonedGiven);
+        ZonedDateTime startOfOfDayAtMidnightTime = zonedDateTime.getStartOfDayAtMidnightTime(zonedGiven);
+
+        assertThat(startOfOfDayWithMethod).isEqualTo(startOfOfDayWithShorthandMethod)
+            .isEqualTo(startOfOfDayFromZonedDateTime)
+            .isEqualTo(startOfOfDayAtMinTime)
+            .isEqualTo(startOfOfDayAtMidnightTime);
+        assertThat(startOfOfDayWithMethod.toLocalTime()).isEqualTo(LocalTime.MIDNIGHT);
+        assertThat(startOfOfDayWithMethod.toLocalTime()
+            .toString()).isEqualTo("00:00");
+    }
 }

core-java-8/src/test/java/com/baeldung/datetime/modify/DateIncrementerUnitTest.java

@@ -0,0 +1,34 @@
+package com.baeldung.datetime.modify;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class DateIncrementerUnitTest {
+    private final static String DATE_TO_INCREMENT = "2018-07-03";
+    private final static String EXPECTED_DATE = "2018-07-04";
+
+    @Test
+    public void givenDate_whenUsingJava8_thenAddOneDay() throws Exception {
+        String incrementedDate = DateIncrementer.addOneDay(DATE_TO_INCREMENT);
+        assertEquals(EXPECTED_DATE, incrementedDate);
+    }
+
+    @Test
+    public void givenDate_whenUsingJodaTime_thenAddOneDay() throws Exception {
+        String incrementedDate = DateIncrementer.addOneDayJodaTime(DATE_TO_INCREMENT);
+        assertEquals(EXPECTED_DATE, incrementedDate);
+    }
+
+    @Test
+    public void givenDate_whenUsingCalendar_thenAddOneDay() throws Exception {
+        String incrementedDate = DateIncrementer.addOneDayCalendar(DATE_TO_INCREMENT);
+        assertEquals(EXPECTED_DATE, incrementedDate);
+    }
+
+    @Test
+    public void givenDate_whenUsingApacheCommons_thenAddOneDay() throws Exception {
+        String incrementedDate = DateIncrementer.addOneDayApacheCommons(DATE_TO_INCREMENT);
+        assertEquals(EXPECTED_DATE, incrementedDate);
+    }
+}

core-java-8/src/test/java/com/baeldung/fileToBase64StringConversion/FileToBase64StringConversionUnitTest.java

@@ -0,0 +1,43 @@
+package com.baeldung.fileToBase64StringConversion;
+
+import static org.junit.Assert.assertTrue;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Base64;
+
+import org.apache.commons.io.FileUtils;
+import org.junit.Test;
+
+public class FileToBase64StringConversionUnitTest {
+
+    private String inputFilePath = "test_image.jpg";
+    private String outputFilePath = "test_image_copy.jpg";
+
+    @Test
+    public void fileToBase64StringConversion() throws IOException {
+        //load file from /src/test/resources
+        ClassLoader classLoader = getClass().getClassLoader();
+        File inputFile = new File(classLoader
+          .getResource(inputFilePath)
+          .getFile());
+
+        byte[] fileContent = FileUtils.readFileToByteArray(inputFile);
+        String encodedString = Base64
+          .getEncoder()
+          .encodeToString(fileContent);
+
+        //create output file
+        File outputFile = new File(inputFile
+          .getParentFile()
+          .getAbsolutePath() + File.pathSeparator + outputFilePath);
+
+        // decode the string and write to file
+        byte[] decodedBytes = Base64
+          .getDecoder()
+          .decode(encodedString);
+        FileUtils.writeByteArrayToFile(outputFile, decodedBytes);
+
+        assertTrue(FileUtils.contentEquals(inputFile, outputFile));
+    }
+}

core-java-9/pom.xml

@@ -13,34 +13,6 @@
     </parent>
 
     <dependencies>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-api</artifactId>
-            <version>${org.slf4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>ch.qos.logback</groupId>
-            <artifactId>logback-classic</artifactId>
-            <version>${ch.qos.logback.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-library</artifactId>
-            <version>${org.hamcrest.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.mockito</groupId>
-            <artifactId>mockito-core</artifactId>
-            <version>${mockito.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>com.jayway.awaitility</groupId>
             <artifactId>awaitility</artifactId>
@@ -77,20 +49,7 @@
     </pluginRepositories>
 
     <properties>
-        <!-- project build encoding -->
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-
-        <!-- logging -->
-        <org.slf4j.version>1.7.21</org.slf4j.version>
-        <ch.qos.logback.version>1.2.1</ch.qos.logback.version>
-        <!-- maven plugins -->
-        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
-        <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
-
         <!-- testing -->
-        <org.hamcrest.version>1.3</org.hamcrest.version>
-        <junit.version>4.12</junit.version>
-        <mockito.version>1.10.19</mockito.version>
         <awaitility.version>1.7.0</awaitility.version>
         <maven.compiler.source>1.9</maven.compiler.source>
         <maven.compiler.target>1.9</maven.compiler.target>

core-java-collections/pom.xml

@@ -15,12 +15,6 @@
     </parent>
 
     <dependencies>
-		<dependency>
-			<groupId>junit</groupId>
-			<artifactId>junit</artifactId>
-			<version>${junit.version}</version>
-			<scope>test</scope>
-		</dependency>
         <dependency>
             <groupId>net.sourceforge.collections</groupId>
             <artifactId>collections-generic</artifactId>

core-java-collections/src/main/java/com/baeldung/java/list/ReverseIterator.java

@@ -0,0 +1,80 @@
+package com.baeldung.java.list;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.ListIterator;
+
+import org.apache.commons.collections4.iterators.ReverseListIterator;
+
+import com.google.common.collect.Lists;
+
+/**
+ * Provides methods for iterating backward over a list.
+ */
+public class ReverseIterator {
+
+    /**
+     * Iterate using the for loop.
+     *
+     * @param list the list
+     */
+    public void iterateUsingForLoop(final List<String> list) {
+
+        for (int i = list.size(); i-- > 0; ) {
+            System.out.println(list.get(i));
+        }
+    }
+
+    /**
+     * Iterate using the Java {@link ListIterator}.
+     *
+     * @param list the list
+     */
+    public void iterateUsingListIterator(final List<String> list) {
+
+        final ListIterator listIterator = list.listIterator(list.size());
+        while (listIterator.hasPrevious()) {
+            System.out.println(listIterator.previous());
+        }
+    }
+
+    /**
+     * Iterate using Java {@link Collections} API.
+     *
+     * @param list the list
+     */
+    public void iterateUsingCollections(final List<String> list) {
+
+        Collections.reverse(list);
+        for (final String item : list) {
+            System.out.println(item);
+        }
+    }
+
+    /**
+     * Iterate using Apache Commons {@link ReverseListIterator}.
+     *
+     * @param list the list
+     */
+    public void iterateUsingApacheReverseListIterator(final List<String> list) {
+
+        final ReverseListIterator listIterator = new ReverseListIterator(list);
+        while (listIterator.hasNext()) {
+            System.out.println(listIterator.next());
+        }
+    }
+
+    /**
+     * Iterate using Guava {@link Lists} API.
+     *
+     * @param list the list
+     */
+    public void iterateUsingGuava(final List<String> list) {
+
+        final List<String> reversedList = Lists.reverse(list);
+        for (final String item : reversedList) {
+            System.out.println(item);
+        }
+    }
+
+}

core-java-collections/src/test/java/com/baeldung/java/list/ReverseIteratorUnitTest.java

@@ -0,0 +1,87 @@
+package com.baeldung.java.list;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.ListIterator;
+
+import org.apache.commons.collections4.iterators.ReverseListIterator;
+import org.apache.commons.lang3.StringUtils;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import com.google.common.collect.Lists;
+
+public class ReverseIteratorUnitTest {
+
+    private final ReverseIterator reverseIterator = new ReverseIterator();
+
+    private List<String> list;
+
+    private final String originalString = "ABCDE";
+
+    @BeforeEach
+    void setUp() {
+
+        list = Lists.newArrayList("A", "B", "C", "D", "E");
+    }
+
+    @Test
+    void whenIteratingUsingForLoop_thenCorrect() {
+
+        String reverseString = "";
+        for (int i = list.size(); i-- > 0; ) {
+            reverseString += list.get(i);
+        }
+        assertEquals(reverseString, StringUtils.reverse(originalString));
+    }
+
+    @Test
+    void whenIteratingUsingListIterator_thenCorrect() {
+
+        String reverseString = "";
+        final ListIterator listIterator = list.listIterator(list.size());
+        while (listIterator.hasPrevious()) {
+            reverseString += listIterator.previous();
+        }
+        assertEquals(reverseString, StringUtils.reverse(originalString));
+    }
+
+    @Test
+    void whenIteratingUsingCollections_thenCorrect() {
+
+        String reverseString = "";
+        Collections.reverse(list);
+        for (final String item : list) {
+            reverseString += item;
+        }
+        assertEquals(reverseString, StringUtils.reverse(originalString));
+
+        assertEquals("E", list.get(0));
+    }
+
+    @Test
+    void whenIteratingUsingApacheReverseListIterator_thenCorrect() {
+
+        String reverseString = "";
+        final ReverseListIterator listIterator = new ReverseListIterator(list);
+        while (listIterator.hasNext()) {
+            reverseString += listIterator.next();
+        }
+        assertEquals(reverseString, StringUtils.reverse(originalString));
+    }
+
+    @Test
+    void whenIteratingUsingGuava_thenCorrect() {
+
+        String reverseString = "";
+        final List<String> reversedList = Lists.reverse(list);
+        for (final String item : reversedList) {
+            reverseString += item;
+        }
+        assertEquals(reverseString, StringUtils.reverse(originalString));
+
+        assertEquals("A", list.get(0));
+    }
+}

core-java-concurrency/pom.xml

@@ -75,93 +75,7 @@
                     </execution>
                 </executions>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-jar-plugin</artifactId>
-                <configuration>
-                    <archive>
-                        <manifest>
-                            <addClasspath>true</addClasspath>
-                            <classpathPrefix>libs/</classpathPrefix>
-                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                        </manifest>
-                    </archive>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-assembly-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>single</goal>
-                        </goals>
-                        <configuration>
-                            <archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
-                            <archive>
-                                <manifest>
-                                    <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                                </manifest>
-                            </archive>
-                            <descriptorRefs>
-                                <descriptorRef>jar-with-dependencies</descriptorRef>
-                            </descriptorRefs>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-shade-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>shade</goal>
-                        </goals>
-                        <configuration>
-                            <shadedArtifactAttached>true</shadedArtifactAttached>
-                            <transformers>
-                                <transformer
-                                        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
-                                    <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                                </transformer>
-                            </transformers>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>com.jolira</groupId>
-                <artifactId>onejar-maven-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <configuration>
-                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                            <attachToBuild>true</attachToBuild>
-                            <filename>${project.build.finalName}-onejar.${project.packaging}</filename>
-                        </configuration>
-                        <goals>
-                            <goal>one-jar</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-maven-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>repackage</goal>
-                        </goals>
-                        <configuration>
-                            <classifier>spring-boot</classifier>
-                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
+            
         </plugins>
     </build>
 
@@ -170,7 +84,6 @@
         <guava.version>21.0</guava.version>
         <commons-lang3.version>3.5</commons-lang3.version>
         <commons-math3.version>3.6.1</commons-math3.version>
-        <commons-io.version>2.5</commons-io.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>
         <!-- testing -->

core-java-io/pom.xml

@@ -74,23 +74,6 @@
             <artifactId>log4j</artifactId>
             <version>${log4j.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-api</artifactId>
-            <version>${org.slf4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>ch.qos.logback</groupId>
-            <artifactId>logback-classic</artifactId>
-            <version>${logback.version}</version>
-            <!-- <scope>runtime</scope> -->
-        </dependency>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>jcl-over-slf4j</artifactId>
-            <version>${org.slf4j.version}</version>
-            <!-- <scope>runtime</scope> --> <!-- some spring dependencies need to compile against jcl -->
-        </dependency>
         <dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
             <groupId>org.slf4j</groupId>
             <artifactId>log4j-over-slf4j</artifactId>
@@ -103,42 +86,12 @@
             <scope>provided</scope>
         </dependency>
         <!-- test scoped -->
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-all</artifactId>
-            <version>${hamcrest-all.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-core</artifactId>
-            <version>${org.hamcrest.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-library</artifactId>
-            <version>${org.hamcrest.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
             <version>${assertj.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.mockito</groupId>
-            <artifactId>mockito-core</artifactId>
-            <version>${mockito.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>com.jayway.awaitility</groupId>
             <artifactId>awaitility</artifactId>
@@ -253,7 +206,7 @@
                         <argument>-Xmx300m</argument>
                         <argument>-XX:+UseParallelGC</argument>
                         <argument>-classpath</argument>
-                        <classpath/>
+                        <classpath />
                         <argument>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</argument>
                     </arguments>
                 </configuration>
@@ -318,7 +271,7 @@
                                     <executable>java</executable>
                                     <arguments>
                                         <argument>-classpath</argument>
-                                        <classpath/>
+                                        <classpath />
                                         <argument>org.openjdk.jmh.Main</argument>
                                         <argument>.*</argument>
                                     </arguments>
@@ -335,18 +288,12 @@
         <!-- marshalling -->
         <jackson.version>2.8.5</jackson.version>
 
-        <!-- logging -->
-        <org.slf4j.version>1.7.21</org.slf4j.version>
-        <logback.version>1.1.7</logback.version>
-
         <!-- util -->
-        <guava.version>22.0</guava.version>
         <commons-lang3.version>3.5</commons-lang3.version>
         <bouncycastle.version>1.55</bouncycastle.version>
         <commons-codec.version>1.10</commons-codec.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <decimal4j.version>1.0.3</decimal4j.version>
-        <commons-io.version>2.5</commons-io.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>
         <unix4j.version>0.4</unix4j.version>
@@ -358,15 +305,10 @@
         <vavr.version>0.9.0</vavr.version>
 
         <!-- testing -->
-        <org.hamcrest.version>1.3</org.hamcrest.version>
-        <junit.version>4.12</junit.version>
-        <mockito.version>2.8.9</mockito.version>
         <assertj.version>3.6.1</assertj.version>
         <avaitility.version>1.7.0</avaitility.version>
 
         <!-- maven plugins -->
-        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
-        <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
         <maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>

core-java-io/src/main/java/com/baeldung/symlink/SymLinkExample.java

@@ -0,0 +1,54 @@
+package com.baeldung.symlink;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.DirectoryStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import static java.nio.file.StandardOpenOption.*;
+import java.util.stream.IntStream;
+
+public class SymLinkExample {
+
+    public void createSymbolicLink(Path link, Path target) throws IOException {
+        if (Files.exists(link)) {
+            Files.delete(link);
+        }
+        Files.createSymbolicLink(link, target);
+    }
+
+    public void createHardLink(Path link, Path target) throws IOException {
+        if (Files.exists(link)) {
+            Files.delete(link);
+        }
+        Files.createLink(link, target);
+    }
+
+    public Path createTextFile() throws IOException {
+        byte[] content = IntStream.range(0, 10000)
+            .mapToObj(i -> i + System.lineSeparator())
+            .reduce("", String::concat)
+            .getBytes(StandardCharsets.UTF_8);
+        Path filePath = Paths.get(".", "target_link.txt");
+        Files.write(filePath, content, CREATE, TRUNCATE_EXISTING);
+        return filePath;
+    }
+
+    public void printLinkFiles(Path path) throws IOException {
+        try (DirectoryStream<Path> stream = Files.newDirectoryStream(path)) {
+            for (Path file : stream) {
+                if (Files.isDirectory(file)) {
+                    printLinkFiles(file);
+                } else if (Files.isSymbolicLink(file)) {
+                    System.out.format("File link '%s' with target '%s'%n", file, Files.readSymbolicLink(file));
+                }
+            }
+        }
+    }
+
+    public static void main(String[] args) throws IOException {
+        new SymLinkExample().printLinkFiles(Paths.get("."));
+    }
+
+}

core-java-io/src/test/java/com/baeldung/symlink/SymLinkExampleUnitTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.symlink;
+
+import static org.junit.Assert.*;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import org.junit.Test;
+
+public class SymLinkExampleUnitTest {
+
+    @Test
+    public void whenUsingFiles_thenCreateSymbolicLink() throws IOException {
+        SymLinkExample example = new SymLinkExample();
+        Path filePath = example.createTextFile();
+        Path linkPath = Paths.get(".", "symbolic_link.txt");
+        example.createSymbolicLink(linkPath, filePath);
+        assertTrue(Files.isSymbolicLink(linkPath));
+    }
+
+    @Test
+    public void whenUsingFiles_thenCreateHardLink() throws IOException {
+        SymLinkExample example = new SymLinkExample();
+        Path filePath = example.createTextFile();
+        Path linkPath = Paths.get(".", "hard_link.txt");
+        example.createHardLink(linkPath, filePath);
+        assertFalse(Files.isSymbolicLink(linkPath));
+        assertEquals(filePath.toFile()
+            .length(),
+            linkPath.toFile()
+                .length());
+    }
+
+}

core-java-io/src/test/java/org/baeldung/java/io/JavaInputStreamToXUnitTest.java

@@ -14,8 +14,10 @@ import org.slf4j.LoggerFactory;
 import java.io.*;
 import java.nio.charset.Charset;
 import java.nio.charset.StandardCharsets;
+import java.nio.file.Path;
 import java.nio.file.StandardCopyOption;
 import java.util.Scanner;
+import java.util.UUID;
 
 import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
 import static org.hamcrest.Matchers.equalTo;
@@ -112,6 +114,19 @@ public class JavaInputStreamToXUnitTest {
         assertThat(writer.toString(), equalTo(originalString));
     }
     
+    @Test
+    public final void givenUsingTempFile_whenConvertingAnInputStreamToAString_thenCorrect() throws IOException {
+        final String originalString = randomAlphabetic(DEFAULT_SIZE);
+        final InputStream inputStream = new ByteArrayInputStream(originalString.getBytes());
+
+        // When
+        Path tempFile = java.nio.file.Files.createTempDirectory("").resolve(UUID.randomUUID().toString() + ".tmp");
+        java.nio.file.Files.copy(inputStream, tempFile, StandardCopyOption.REPLACE_EXISTING);
+        String result = new String(java.nio.file.Files.readAllBytes(tempFile));
+
+        assertThat(result, equalTo(originalString));
+    }
+
     // tests - InputStream to byte[]
 
     @Test

core-java-sun/pom.xml

@@ -1,4 +1,5 @@
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.baeldung</groupId>
     <artifactId>core-java-sun</artifactId>
@@ -73,23 +74,6 @@
             <artifactId>log4j</artifactId>
             <version>${log4j.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-api</artifactId>
-            <version>${org.slf4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>ch.qos.logback</groupId>
-            <artifactId>logback-classic</artifactId>
-            <version>${logback.version}</version>
-            <!-- <scope>runtime</scope> -->
-        </dependency>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>jcl-over-slf4j</artifactId>
-            <version>${org.slf4j.version}</version>
-            <!-- <scope>runtime</scope> --> <!-- some spring dependencies need to compile against jcl -->
-        </dependency>
         <dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
             <groupId>org.slf4j</groupId>
             <artifactId>log4j-over-slf4j</artifactId>
@@ -102,42 +86,12 @@
             <scope>provided</scope>
         </dependency>
         <!-- test scoped -->
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-all</artifactId>
-            <version>${hamcrest-all.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-core</artifactId>
-            <version>${org.hamcrest.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-library</artifactId>
-            <version>${org.hamcrest.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
             <version>${assertj.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.mockito</groupId>
-            <artifactId>mockito-core</artifactId>
-            <version>${mockito.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>com.jayway.awaitility</groupId>
             <artifactId>awaitility</artifactId>
@@ -231,6 +185,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jar-plugin</artifactId>
+                <version>${maven-jar-plugin.version}</version>
                 <configuration>
                     <archive>
                         <manifest>
@@ -241,79 +196,6 @@
                     </archive>
                 </configuration>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-assembly-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>single</goal>
-                        </goals>
-                        <configuration>
-                            <archiveBaseDirectory>${project.basedir}</archiveBaseDirectory>
-                            <archive>
-                                <manifest>
-                                    <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                                </manifest>
-                            </archive>
-                            <descriptorRefs>
-                                <descriptorRef>jar-with-dependencies</descriptorRef>
-                            </descriptorRefs>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-shade-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>shade</goal>
-                        </goals>
-                        <configuration>
-                            <shadedArtifactAttached>true</shadedArtifactAttached>
-                            <transformers>
-                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
-                                    <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                                </transformer>
-                            </transformers>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>com.jolira</groupId>
-                <artifactId>onejar-maven-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <configuration>
-                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                            <attachToBuild>true</attachToBuild>
-                            <filename>${project.build.finalName}-onejar.${project.packaging}</filename>
-                        </configuration>
-                        <goals>
-                            <goal>one-jar</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.springframework.boot</groupId>
-                <artifactId>spring-boot-maven-plugin</artifactId>
-                <executions>
-                    <execution>
-                        <goals>
-                            <goal>repackage</goal>
-                        </goals>
-                        <configuration>
-                            <classifier>spring-boot</classifier>
-                            <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
@@ -325,7 +207,7 @@
                         <argument>-Xmx300m</argument>
                         <argument>-XX:+UseParallelGC</argument>
                         <argument>-classpath</argument>
-                        <classpath/>
+                        <classpath />
                         <argument>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</argument>
                     </arguments>
                 </configuration>
@@ -381,7 +263,7 @@
                                     <executable>java</executable>
                                     <arguments>
                                         <argument>-classpath</argument>
-                                        <classpath/>
+                                        <classpath />
                                         <argument>org.openjdk.jmh.Main</argument>
                                         <argument>.*</argument>
                                     </arguments>
@@ -398,10 +280,6 @@
         <!-- marshalling -->
         <jackson.version>2.8.5</jackson.version>
 
-        <!-- logging -->
-        <org.slf4j.version>1.7.21</org.slf4j.version>
-        <logback.version>1.1.7</logback.version>
-
         <!-- util -->
         <guava.version>23.0</guava.version>
         <commons-lang3.version>3.5</commons-lang3.version>
@@ -409,7 +287,6 @@
         <commons-codec.version>1.10</commons-codec.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <decimal4j.version>1.0.3</decimal4j.version>
-        <commons-io.version>2.5</commons-io.version>
         <commons-collections4.version>4.1</commons-collections4.version>
         <collections-generic.version>4.01</collections-generic.version>
         <unix4j.version>0.4</unix4j.version>
@@ -419,18 +296,16 @@
         <protonpack.version>1.13</protonpack.version>
         <streamex.version>0.6.5</streamex.version>
         <vavr.version>0.9.0</vavr.version>
+        <spring-web.version>4.3.4.RELEASE</spring-web.version>
 
         <!-- testing -->
-        <org.hamcrest.version>1.3</org.hamcrest.version>
-        <mockito.version>2.8.9</mockito.version>
         <assertj.version>3.6.1</assertj.version>
         <avaitility.version>1.7.0</avaitility.version>
 
         <!-- maven plugins -->
-        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
         <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
         <sun-tools.version>1.8.0</sun-tools.version>
-        <spring-web.version>4.3.4.RELEASE</spring-web.version>
+        <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
     </properties>
 
 </project>

core-java/README.md

@@ -3,7 +3,6 @@
 ## Core Java Cookbooks and Examples
 
 ### Relevant Articles: 
-- [Java – Random Long, Float, Integer and Double](http://www.baeldung.com/java-generate-random-long-float-integer-double)
 - [Java – Generate Random String](http://www.baeldung.com/java-random-string)
 - [Java Timer](http://www.baeldung.com/java-timer-and-timertask)
 - [How to Run a Shell Command in Java](http://www.baeldung.com/run-shell-command-in-java)
@@ -38,7 +37,6 @@
 - [A Quick JUnit vs TestNG Comparison](http://www.baeldung.com/junit-vs-testng)
 - [Java Primitive Conversions](http://www.baeldung.com/java-primitive-conversions)
 - [Java Money and the Currency API](http://www.baeldung.com/java-money-and-currency)
-- [Using Math.pow in Java](http://www.baeldung.com/java-math-pow)
 - [Converting Strings to Enums in Java](http://www.baeldung.com/java-string-to-enum)
 - [Quick Guide to the Java StringTokenizer](http://www.baeldung.com/java-stringtokenizer)
 - [JVM Log Forging](http://www.baeldung.com/jvm-log-forging)
@@ -49,7 +47,6 @@
 - [How to Add a Single Element to a Stream](http://www.baeldung.com/java-stream-append-prepend)
 - [Iterating Over Enum Values in Java](http://www.baeldung.com/java-enum-iteration)
 - [Kotlin Java Interoperability](http://www.baeldung.com/kotlin-java-interoperability)
-- [How to Round a Number to N Decimal Places in Java](http://www.baeldung.com/java-round-decimal-number)
 - [Changing Annotation Parameters At Runtime](http://www.baeldung.com/java-reflection-change-annotation-params)
 - [How to Find all Getters Returning Null](http://www.baeldung.com/java-getters-returning-null)
 - [Changing the Order in a Sum Operation Can Produce Different Results?](http://www.baeldung.com/java-floating-point-sum-order)
@@ -77,7 +74,6 @@
 - [“Sneaky Throws” in Java](http://www.baeldung.com/java-sneaky-throws)
 - [OutOfMemoryError: GC Overhead Limit Exceeded](http://www.baeldung.com/java-gc-overhead-limit-exceeded)
 - [StringBuilder and StringBuffer in Java](http://www.baeldung.com/java-string-builder-string-buffer)
-- [Number of Digits in an Integer in Java](http://www.baeldung.com/java-number-of-digits-in-int)
 - [Creating a Java Compiler Plugin](http://www.baeldung.com/java-build-compiler-plugin)
 - [A Guide to the Static Keyword in Java](http://www.baeldung.com/java-static)
 - [Initializing Arrays in Java](http://www.baeldung.com/java-initialize-array)
@@ -132,7 +128,6 @@
 - [Find Sum and Average in a Java Array](http://www.baeldung.com/java-array-sum-average)
 - [Java List UnsupportedOperationException](http://www.baeldung.com/java-list-unsupported-operation-exception)
 - [Type Erasure in Java Explained](http://www.baeldung.com/java-type-erasure)
-- [BigDecimal and BigInteger in Java](http://www.baeldung.com/java-bigdecimal-biginteger)
 - [Display All Time Zones With GMT And UTC in Java](http://www.baeldung.com/java-time-zones)
 - [Join and Split Arrays and Collections in Java](http://www.baeldung.com/java-join-and-split)
 - [Check If Two Lists are Equal in Java](http://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
@@ -147,7 +142,6 @@
 - [Check If a String Is Numeric in Java](http://www.baeldung.com/java-check-string-number)
 - [Variable and Method Hiding in Java](http://www.baeldung.com/java-variable-method-hiding)
 - [Access Modifiers in Java](http://www.baeldung.com/java-access-modifiers)
-- [NaN in Java](http://www.baeldung.com/java-not-a-number)
 - [Infinite Loops in Java](http://www.baeldung.com/infinite-loops-java)
 - [Why Use char[] Array Over a String for Storing Passwords in Java?](http://www.baeldung.com/java-storing-passwords)
 - [Introduction to Creational Design Patterns](http://www.baeldung.com/creational-design-patterns)
@@ -160,3 +154,12 @@
 - [Guide to the super Java Keyword](http://www.baeldung.com/java-super)
 - [Guide to the this Java Keyword](http://www.baeldung.com/java-this)
 - [Jagged Arrays In Java](http://www.baeldung.com/java-jagged-arrays)
+- [Importance of Main Manifest Attribute in a Self-Executing JAR](http://www.baeldung.com/java-jar-executable-manifest-main-class)
+- [Extracting Year, Month and Day from Date in Java](http://www.baeldung.com/java-year-month-day)
+- [Get Date Without Time in Java](http://www.baeldung.com/java-date-without-time)
+- [Convert a String to Title Case](http://www.baeldung.com/java-string-title-case)
+- [How to Get the File Extension of a File in Java](http://www.baeldung.com/java-file-extension)
+- [Immutable Objects in Java](http://www.baeldung.com/java-immutable-object)
+- [Console I/O in Java](http://www.baeldung.com/java-console-input-output)
+- [Guide to the java.util.Arrays Class](http://www.baeldung.com/java-util-arrays)
+- [Create a Custom Exception in Java](http://www.baeldung.com/java-new-custom-exception)

core-java/pom.xml

@@ -25,16 +25,6 @@
             <artifactId>commons-lang3</artifactId>
             <version>${commons-lang3.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-math3</artifactId>
-            <version>${commons-math3.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.decimal4j</groupId>
-            <artifactId>decimal4j</artifactId>
-            <version>${decimal4j.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.bouncycastle</groupId>
             <artifactId>bcprov-jdk15on</artifactId>
@@ -68,23 +58,6 @@
             <artifactId>log4j</artifactId>
             <version>${log4j.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>slf4j-api</artifactId>
-            <version>${org.slf4j.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>ch.qos.logback</groupId>
-            <artifactId>logback-classic</artifactId>
-            <version>${logback.version}</version>
-            <!-- <scope>runtime</scope> -->
-        </dependency>
-        <dependency>
-            <groupId>org.slf4j</groupId>
-            <artifactId>jcl-over-slf4j</artifactId>
-            <version>${org.slf4j.version}</version>
-            <!-- <scope>runtime</scope> --> <!-- some spring dependencies need to compile against jcl -->
-        </dependency>
         <dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
             <groupId>org.slf4j</groupId>
             <artifactId>log4j-over-slf4j</artifactId>
@@ -97,42 +70,12 @@
             <scope>provided</scope>
         </dependency>
         <!-- test scoped -->
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-all</artifactId>
-            <version>${hamcrest-all.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>${junit.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-core</artifactId>
-            <version>${org.hamcrest.version}</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.hamcrest</groupId>
-            <artifactId>hamcrest-library</artifactId>
-            <version>${org.hamcrest.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
             <version>${assertj.version}</version>
             <scope>test</scope>
         </dependency>
-        <dependency>
-            <groupId>org.mockito</groupId>
-            <artifactId>mockito-core</artifactId>
-            <version>${mockito.version}</version>
-            <scope>test</scope>
-        </dependency>
         <dependency>
             <groupId>commons-codec</groupId>
             <artifactId>commons-codec</artifactId>
@@ -199,9 +142,9 @@
             <version>${javax.mail.version}</version>
         </dependency>
         <dependency>
-            <groupId>javax.mail</groupId>
-            <artifactId>mail</artifactId>
-            <version>1.5.0-b01</version>
+            <groupId>com.ibm.icu</groupId>
+            <artifactId>icu4j</artifactId>
+            <version>${icu4j.version}</version>
         </dependency>
     </dependencies>
 
@@ -250,6 +193,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-jar-plugin</artifactId>
+                <version>${maven-jar-plugin.version}</version>
                 <configuration>
                     <archive>
                         <manifest>
@@ -288,6 +232,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
+                <version>${maven-shade-plugin.version}</version>
                 <executions>
                     <execution>
                         <goals>
@@ -296,8 +241,7 @@
                         <configuration>
                             <shadedArtifactAttached>true</shadedArtifactAttached>
                             <transformers>
-                                <transformer
-                                        implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
+                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                     <mainClass>org.baeldung.executable.ExecutableMavenJar</mainClass>
                                 </transformer>
                             </transformers>
@@ -309,6 +253,7 @@
             <plugin>
                 <groupId>com.jolira</groupId>
                 <artifactId>onejar-maven-plugin</artifactId>
+                <version>${onejar-maven-plugin.version}</version>
                 <executions>
                     <execution>
                         <configuration>
@@ -326,6 +271,7 @@
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
+                <version>${spring-boot-maven-plugin.version}</version>
                 <executions>
                     <execution>
                         <goals>
@@ -350,7 +296,7 @@
                         <argument>-Xmx300m</argument>
                         <argument>-XX:+UseParallelGC</argument>
                         <argument>-classpath</argument>
-                        <classpath/>
+                        <classpath />
                         <argument>com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed</argument>
                     </arguments>
                 </configuration>
@@ -402,7 +348,6 @@
                     <plugin>
                         <groupId>org.codehaus.mojo</groupId>
                         <artifactId>exec-maven-plugin</artifactId>
-
                         <executions>
                             <execution>
                                 <id>run-benchmarks</id>
@@ -416,7 +361,7 @@
                                     <executable>java</executable>
                                     <arguments>
                                         <argument>-classpath</argument>
-                                        <classpath/>
+                                        <classpath />
                                         <argument>org.openjdk.jmh.Main</argument>
                                         <argument>.*</argument>
                                     </arguments>
@@ -434,18 +379,13 @@
         <jackson.version>2.8.5</jackson.version>
         <gson.version>2.8.2</gson.version>
 
-        <!-- logging -->
-        <org.slf4j.version>1.7.21</org.slf4j.version>
-        <logback.version>1.1.7</logback.version>
-        <log4j.version>1.2.17</log4j.version>
-
         <!-- util -->
         <commons-lang3.version>3.5</commons-lang3.version>
         <bouncycastle.version>1.55</bouncycastle.version>
         <commons-codec.version>1.10</commons-codec.version>
+        <commons-io.version>2.5</commons-io.version>
         <commons-math3.version>3.6.1</commons-math3.version>
         <decimal4j.version>1.0.3</decimal4j.version>
-        <commons-io.version>2.5</commons-io.version>
         <unix4j.version>0.4</unix4j.version>
         <grep4j.version>1.8.7</grep4j.version>
         <lombok.version>1.16.12</lombok.version>
@@ -455,24 +395,24 @@
         <vavr.version>0.9.0</vavr.version>
 
         <!-- testing -->
-        <org.hamcrest.version>1.3</org.hamcrest.version>
-        <mockito.version>2.8.9</mockito.version>
         <assertj.version>3.6.1</assertj.version>
 
         <!-- maven plugins -->
-        <maven-compiler-plugin.version>3.7.0</maven-compiler-plugin.version>
         <maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
         <springframework.spring-web.version>4.3.4.RELEASE</springframework.spring-web.version>
         <springframework.boot.spring-boot-starter.version>1.5.8.RELEASE</springframework.boot.spring-boot-starter.version>
         <javamoney.moneta.version>1.1</javamoney.moneta.version>
-        <hamcrest-all.version>1.3</hamcrest-all.version>
         <h2database.version>1.4.197</h2database.version>
         <esapi.version>2.1.0.1</esapi.version>
         <jmh-core.version>1.19</jmh-core.version>
         <jmh-generator-annprocess.version>1.19</jmh-generator-annprocess.version>
         <maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
-        <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
         <javax.mail.version>1.5.0-b01</javax.mail.version>
+        <maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
+        <onejar-maven-plugin.version>1.4.4</onejar-maven-plugin.version>
+        <maven-shade-plugin.version>3.1.1</maven-shade-plugin.version>
+        <spring-boot-maven-plugin.version>2.0.3.RELEASE</spring-boot-maven-plugin.version>
+        <icu4j.version>61.1</icu4j.version>
     </properties>
 
 </project>

core-java/src/main/java/com/baeldung/console/ConsoleConsoleClass.java

@@ -0,0 +1,26 @@
+package com.baeldung.console;
+
+import java.io.Console;
+
+public class ConsoleConsoleClass {
+
+    public static void main(String[] args) {
+        Console console = System.console();
+
+        if (console == null) {
+            System.out.print("No console available");
+            return;
+        }
+
+        String progLanguauge = console.readLine("Enter your favourite programming language: ");
+        console.printf(progLanguauge + " is very interesting!");
+
+        char[] pass = console.readPassword("To finish, enter password: ");
+        
+        if ("BAELDUNG".equals(pass.toString().toUpperCase()))
+            console.printf("Good! Regards!");
+        else 
+            console.printf("Nice try. Regards.");
+
+    }
+}

core-java/src/main/java/com/baeldung/console/ConsoleScannerClass.java

@@ -0,0 +1,76 @@
+package com.baeldung.console;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Scanner;
+import java.util.regex.Pattern;
+
+public class ConsoleScannerClass {
+
+    public static void main(String[] args) {
+        System.out.println("Please enter your name and surname: ");
+
+        Scanner scanner = new Scanner(System.in);
+
+        String nameSurname = scanner.nextLine();
+
+        System.out.println("Please enter your gender: ");
+
+        char gender = scanner.next().charAt(0);
+
+        System.out.println("Please enter your age: ");
+
+        int age = scanner.nextInt();
+
+        System.out.println("Please enter your height in meters: ");
+
+        double height = scanner.nextDouble();
+
+        System.out.println(nameSurname + ", " + age + ", is a great " + (gender == 'm' ? "guy" : "girl") + " with " + height + " meters height" + " and " + (gender == 'm' ? "he" : "she") + " reads Baeldung.");
+
+        System.out.print("Have a good");
+        System.out.print(" one!");
+
+        System.out.println("\nPlease enter number of years of experience as a developer: ");
+
+        BufferedReader buffReader = new BufferedReader(new InputStreamReader(System.in));
+
+        int i = 0;
+
+        try {
+            i = Integer.parseInt(buffReader.readLine());
+        } catch (NumberFormatException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        } catch (IOException e) {
+            // TODO Auto-generated catch block
+            e.printStackTrace();
+        }
+
+        System.out.println("You are a " + (i > 5 ? "great" : "good") + " developer!");
+
+        int sum = 0, count = 0;
+
+        System.out.println("Please enter your college degrees. To finish, enter baeldung website url");
+
+        while (scanner.hasNextInt()) {
+            int nmbr = scanner.nextInt();
+            sum += nmbr;
+            count++;
+        }
+        int mean = sum / count;
+
+        System.out.println("Your average degree is " + mean);
+
+        if (scanner.hasNext(Pattern.compile("www.baeldung.com")))
+            System.out.println("Correct!");
+        else
+            System.out.println("Baeldung website url is www.baeldung.com");
+
+        if (scanner != null)
+            scanner.close();
+
+    }
+
+}

core-java/src/main/java/com/baeldung/customexception/FileManager.java

@@ -0,0 +1,43 @@
+package com.baeldung.customexception;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.Scanner;
+
+public class FileManager {
+
+    public static String getFirstLine(String fileName) throws IncorrectFileNameException {
+        try (Scanner file = new Scanner(new File(fileName))) {
+            if (file.hasNextLine()) {
+                return file.nextLine();
+            } else {
+                throw new IllegalArgumentException("Non readable file");
+            }
+        } catch (FileNotFoundException err) {
+            if (!isCorrectFileName(fileName)) {
+                throw new IncorrectFileNameException("Incorrect filename : " + fileName, err);
+            }
+            // Logging etc
+        } catch (IllegalArgumentException err) {
+            if (!containsExtension(fileName)) {
+                throw new IncorrectFileExtensionException("Filename does not contain extension : " + fileName, err);
+            }
+            // Other error cases and logging
+        }
+        return "Default First Line";
+    }
+
+    private static boolean containsExtension(String fileName) {
+        if (fileName.contains(".txt") || fileName.contains(".doc"))
+            return true;
+        return false;
+    }
+
+    private static boolean isCorrectFileName(String fileName) {
+        if (fileName.equals("wrongFileName.txt"))
+            return false;
+        else
+            return true;
+    }
+
+}

core-java/src/main/java/com/baeldung/customexception/IncorrectFileExtensionException.java

@@ -0,0 +1,9 @@
+package com.baeldung.customexception;
+
+public class IncorrectFileExtensionException extends RuntimeException{
+    private static final long serialVersionUID = 1L;
+
+    public IncorrectFileExtensionException(String errorMessage, Throwable err) {
+        super(errorMessage, err);
+    }
+}

core-java/src/main/java/com/baeldung/customexception/IncorrectFileNameException.java

@@ -0,0 +1,9 @@
+package com.baeldung.customexception;
+
+public class IncorrectFileNameException extends Exception {
+    private static final long serialVersionUID = 1L;
+    
+    public IncorrectFileNameException(String errorMessage, Throwable err) {
+        super(errorMessage, err);
+    }
+}

core-java/src/main/java/com/baeldung/date/DateWithoutTime.java

@@ -0,0 +1,30 @@
+package com.baeldung.date;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.time.LocalDate;
+import java.util.Calendar;
+import java.util.Date;
+
+public class DateWithoutTime {
+
+    public static Date getDateWithoutTimeUsingCalendar() {
+        Calendar calendar = Calendar.getInstance();
+        calendar.set(Calendar.HOUR_OF_DAY, 0);
+        calendar.set(Calendar.MINUTE, 0);
+        calendar.set(Calendar.SECOND, 0);
+        calendar.set(Calendar.MILLISECOND, 0);
+
+        return calendar.getTime();
+    }
+
+    public static Date getDateWithoutTimeUsingFormat() throws ParseException {
+        SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
+        return formatter.parse(formatter.format(new Date()));
+    }
+
+    public static LocalDate getLocalDate() {
+        return LocalDate.now();
+    }
+
+}

core-java/src/main/java/com/baeldung/datetime/DateExtractYearMonthDayIntegerValues.java

@@ -0,0 +1,28 @@
+package com.baeldung.datetime;
+
+import java.util.Calendar;
+import java.util.Date;
+
+public class DateExtractYearMonthDayIntegerValues {
+
+    int getYear(Date date) {
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTime(date);
+
+        return calendar.get(Calendar.YEAR);
+    }
+
+    int getMonth(Date date) {
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTime(date);
+
+        return calendar.get(Calendar.MONTH);
+    }
+
+    int getDay(Date date) {
+        Calendar calendar = Calendar.getInstance();
+        calendar.setTime(date);
+
+        return calendar.get(Calendar.DAY_OF_MONTH);
+    }
+}

core-java/src/main/java/com/baeldung/datetime/LocalDateExtractYearMonthDayIntegerValues.java

@@ -0,0 +1,18 @@
+package com.baeldung.datetime;
+
+import java.time.LocalDate;
+
+public class LocalDateExtractYearMonthDayIntegerValues {
+
+    int getYear(LocalDate localDate) {
+        return localDate.getYear();
+    }
+
+    int getMonth(LocalDate localDate) {
+        return localDate.getMonthValue();
+    }
+
+    int getDay(LocalDate localDate) {
+        return localDate.getDayOfMonth();
+    }
+}

core-java/src/main/java/com/baeldung/datetime/LocalDateTimeExtractYearMonthDayIntegerValues.java

@@ -0,0 +1,18 @@
+package com.baeldung.datetime;
+
+import java.time.LocalDateTime;
+
+public class LocalDateTimeExtractYearMonthDayIntegerValues {
+
+    int getYear(LocalDateTime localDateTime) {
+        return localDateTime.getYear();
+    }
+
+    int getMonth(LocalDateTime localDateTime) {
+        return localDateTime.getMonthValue();
+    }
+
+    int getDay(LocalDateTime localDateTime) {
+        return localDateTime.getDayOfMonth();
+    }
+}

core-java/src/main/java/com/baeldung/datetime/OffsetDateTimeExtractYearMonthDayIntegerValues.java

@@ -0,0 +1,18 @@
+package com.baeldung.datetime;
+
+import java.time.OffsetDateTime;
+
+public class OffsetDateTimeExtractYearMonthDayIntegerValues {
+
+    int getYear(OffsetDateTime offsetDateTime) {
+        return offsetDateTime.getYear();
+    }
+
+    int getMonth(OffsetDateTime offsetDateTime) {
+        return offsetDateTime.getMonthValue();
+    }
+
+    int getDay(OffsetDateTime offsetDateTime) {
+        return offsetDateTime.getDayOfMonth();
+    }
+}

core-java/src/main/java/com/baeldung/datetime/ZonedDateTimeExtractYearMonthDayIntegerValues.java

@@ -0,0 +1,18 @@
+package com.baeldung.datetime;
+
+import java.time.ZonedDateTime;
+
+public class ZonedDateTimeExtractYearMonthDayIntegerValues {
+
+    int getYear(ZonedDateTime zonedDateTime) {
+        return zonedDateTime.getYear();
+    }
+
+    int getMonth(ZonedDateTime zonedDateTime) {
+        return zonedDateTime.getMonthValue();
+    }
+
+    int getDay(ZonedDateTime zonedDateTime) {
+        return zonedDateTime.getDayOfMonth();
+    }
+}