Merge remote-tracking branch 'upstream/master'

.travis.yml

@@ -4,7 +4,7 @@ before_install:
   - echo "MAVEN_OPTS='-Xmx2048M -Xss128M -XX:+CMSClassUnloadingEnabled -XX:+UseG1GC -XX:-UseGCOverheadLimit'" > ~/.mavenrc
 
 install: skip
-script: travis_wait 60 mvn -q install -Pdefault-first,default-second
+script: travis_wait 60 mvn -q install -Pdefault-first,default-second -Dgib.enabled=true
 
 sudo: required
 

JGit/src/main/java/com/baeldung/jgit/porcelain/Log.java

@@ -28,14 +28,14 @@ public class Log {
                 System.out.println("Had " + count + " commits overall on current branch");
 
                 logs = git.log()
-                        .add(repository.resolve("remotes/origin/testbranch"))
+                        .add(repository.resolve(git.getRepository().getFullBranch()))
                         .call();
                 count = 0;
                 for (RevCommit rev : logs) {
                     System.out.println("Commit: " + rev /* + ", name: " + rev.getName() + ", id: " + rev.getId().getName() */);
                     count++;
                 }
-                System.out.println("Had " + count + " commits overall on test-branch");
+                System.out.println("Had " + count + " commits overall on "+git.getRepository().getFullBranch());
 
                 logs = git.log()
                         .all()

JGit/src/test/java/com/baeldung/jgit/JGitBugIntegrationTest.java

@@ -1,3 +1,5 @@
+package com.baeldung.jgit;
+
 import com.baeldung.jgit.helper.Helper;
 import org.eclipse.jgit.lib.ObjectLoader;
 import org.eclipse.jgit.lib.ObjectReader;

algorithms-genetic/README.md

@@ -1,4 +1,6 @@
 ## Relevant articles:
 
 - [Introduction to Jenetics Library](http://www.baeldung.com/jenetics)
-- [Ant Colony Optimization](http://www.baeldung.com/java-ant-colony-optimization)
+- [Ant Colony Optimization](http://www.baeldung.com/java-ant-colony-optimization)
+- [Design a Genetic Algorithm in Java](https://www.baeldung.com/java-genetic-algorithm)
+- [The Traveling Salesman Problem in Java](https://www.baeldung.com/java-simulated-annealing-for-traveling-salesman)

algorithms-genetic/pom.xml

@@ -1,10 +1,10 @@
 <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>algorithms-genetic</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-
+    <name>algorithms-genetic</name>
+    
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>parent-modules</artifactId>
@@ -61,4 +61,5 @@
         <commons-codec.version>1.11</commons-codec.version>
     </properties>
 
-</project>
+    
+</project>

algorithms-genetic/roundUpToHundred/.gitignore

@@ -1 +0,0 @@
-/bin/

algorithms-genetic/roundUpToHundred/src/com/java/src/RoundUpToHundred.java

@@ -1,20 +0,0 @@
-package com.java.src;
-
-import java.util.Scanner;
-
-public class RoundUpToHundred {
-
-    public static void main(String[] args) {
-        Scanner scanner = new Scanner(System.in);
-        double input = scanner.nextDouble();
-        scanner.close();
-
-        RoundUpToHundred.round(input);
-    }
-
-    static long round(double input) {
-        long i = (long) Math.ceil(input);
-        return ((i + 99) / 100) * 100;
-    };
-
-}

algorithms-genetic/roundUpToHundred/src/com/java/src/RoundUpToHundredTest.java

@@ -1,14 +0,0 @@
-package com.java.src;
-
-import static org.junit.Assert.assertEquals;
-
-import org.junit.Test;
-
-public class RoundUpToHundredTest {
-    @Test
-    public void givenInput_whenRound_thenRoundUpToTheNearestHundred() {
-        assertEquals("Rounded up to hundred", 100, RoundUpToHundred.round(99));
-        assertEquals("Rounded up to three hundred ", 300, RoundUpToHundred.round(200.2));
-        assertEquals("Returns same rounded value", 400, RoundUpToHundred.round(400));
-    }
-}

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

@@ -5,7 +5,6 @@ import java.util.Scanner;
 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;
 
 public class RunAlgorithm {
 
@@ -13,11 +12,8 @@ public class RunAlgorithm {
 		Scanner in = new Scanner(System.in);
 		System.out.println("Run algorithm:");
 		System.out.println("1 - Simulated Annealing");
-		System.out.println("2 - Slope One");
+		System.out.println("2 - Simple Genetic Algorithm");
-		System.out.println("3 - Simple Genetic Algorithm");
+		System.out.println("3 - Ant Colony");
-		System.out.println("4 - Ant Colony");
-		System.out.println("5 - Dijkstra");
-		System.out.println("6 - All pairs in an array that add up to a given sum");
 		int decision = in.nextInt();
 		switch (decision) {
 		case 1:
@@ -25,19 +21,13 @@ public class RunAlgorithm {
 					"Optimized distance for travel: " + SimulatedAnnealing.simulateAnnealing(10, 10000, 0.9995));
 			break;
 		case 2:
-			SlopeOne.slopeOne(3);
-			break;
-		case 3:
 			SimpleGeneticAlgorithm ga = new SimpleGeneticAlgorithm();
 			ga.runAlgorithm(50, "1011000100000100010000100000100111001000000100000100000000001111");
 			break;
-		case 4:
+		case 3:
 			AntColonyOptimization antColony = new AntColonyOptimization(21);
 			antColony.startAntOptimization();
 			break;
-		case 5:
-			System.out.println("Please run the DijkstraAlgorithmTest.");
-			break;
 		default:
 			System.out.println("Unknown option");
 			break;

algorithms-miscellaneous-1/README.md

@@ -9,4 +9,5 @@
 - [How to Find the Kth Largest Element in Java](http://www.baeldung.com/java-kth-largest-element)
 - [Multi-Swarm Optimization Algorithm in Java](http://www.baeldung.com/java-multi-swarm-algorithm)
 - [String Search Algorithms for Large Texts](http://www.baeldung.com/java-full-text-search-algorithms)
-- [Check If a String Contains All The Letters of The Alphabet](https://www.baeldung.com/java-string-contains-all-letters)
+- [Check If a String Contains All The Letters of The Alphabet](https://www.baeldung.com/java-string-contains-all-letters)
+- [Find the Middle Element of a Linked List](http://www.baeldung.com/java-linked-list-middle-element)

algorithms-miscellaneous-1/pom.xml

@@ -1,10 +1,10 @@
 <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>algorithms-miscellaneous-1</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-
+    <name>algorithms-miscellaneous-1</name>
+    
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>parent-modules</artifactId>
@@ -17,6 +17,11 @@
             <artifactId>commons-math3</artifactId>
             <version>${commons-math3.version}</version>
         </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
+        </dependency>
         <dependency>
             <groupId>commons-codec</groupId>
             <artifactId>commons-codec</artifactId>
@@ -73,6 +78,7 @@
         <commons-math3.version>3.6.1</commons-math3.version>
         <org.assertj.core.version>3.9.0</org.assertj.core.version>
         <commons-codec.version>1.11</commons-codec.version>
+        <guava.version>25.1-jre</guava.version>
     </properties>
 
 </project>

algorithms-miscellaneous-1/roundUpToHundred/.gitignore

@@ -1 +0,0 @@
-/bin/

algorithms-miscellaneous-1/roundUpToHundred/src/com/java/src/RoundUpToHundredTest.java

@@ -1,14 +0,0 @@
-package com.java.src;
-
-import static org.junit.Assert.assertEquals;
-
-import org.junit.Test;
-
-public class RoundUpToHundredTest {
-    @Test
-    public void givenInput_whenRound_thenRoundUpToTheNearestHundred() {
-        assertEquals("Rounded up to hundred", 100, RoundUpToHundred.round(99));
-        assertEquals("Rounded up to three hundred ", 300, RoundUpToHundred.round(200.2));
-        assertEquals("Returns same rounded value", 400, RoundUpToHundred.round(400));
-    }
-}

algorithms-miscellaneous-1/src/main/java/com/baeldung/algorithms/factorial/Factorial.java

@@ -0,0 +1,63 @@
+package com.baeldung.algorithms.factorial;
+
+import java.math.BigInteger;
+import java.util.stream.LongStream;
+
+import org.apache.commons.math3.util.CombinatoricsUtils;
+
+import com.google.common.math.BigIntegerMath;
+
+public class Factorial {
+
+    public long factorialUsingForLoop(int n) {
+        long fact = 1;
+        for (int i = 2; i <= n; i++) {
+            fact = fact * i;
+        }
+        return fact;
+    }
+
+    public long factorialUsingStreams(int n) {
+        return LongStream.rangeClosed(1, n)
+            .reduce(1, (long x, long y) -> x * y);
+    }
+
+    public long factorialUsingRecursion(int n) {
+        if (n <= 2) {
+            return n;
+        }
+        return n * factorialUsingRecursion(n - 1);
+    }
+
+    private Long[] factorials = new Long[20];
+
+    public long factorialUsingMemoize(int n) {
+
+        if (factorials[n] != null) {
+            return factorials[n];
+        }
+
+        if (n <= 2) {
+            return n;
+        }
+        long nthValue = n * factorialUsingMemoize(n - 1);
+        factorials[n] = nthValue;
+        return nthValue;
+    }
+
+    public BigInteger factorialHavingLargeResult(int n) {
+        BigInteger result = BigInteger.ONE;
+        for (int i = 2; i <= n; i++)
+            result = result.multiply(BigInteger.valueOf(i));
+        return result;
+    }
+
+    public long factorialUsingApacheCommons(int n) {
+        return CombinatoricsUtils.factorial(n);
+    }
+
+    public BigInteger factorialUsingGuava(int n) {
+        return BigIntegerMath.factorial(n);
+    }
+
+}

algorithms-miscellaneous-1/src/main/java/com/baeldung/algorithms/string/LongestSubstringNonRepeatingCharacters.java

@@ -0,0 +1,54 @@
+package com.baeldung.algorithms.string;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+public class LongestSubstringNonRepeatingCharacters {
+
+    public static String getUniqueCharacterSubstringBruteForce(String input) {
+        String output = "";
+        for (int start = 0; start < input.length(); start++) {
+            Set<Character> visited = new HashSet<>();
+            int end = start;
+            for (; end < input.length(); end++) {
+                char currChar = input.charAt(end);
+                if (visited.contains(currChar)) {
+                    break;
+                } else {
+                    visited.add(currChar);
+                }
+            }
+            if (output.length() < end - start + 1) {
+                output = input.substring(start, end);
+            }
+        }
+        return output;
+    }
+
+    public static String getUniqueCharacterSubstring(String input) {
+        Map<Character, Integer> visited = new HashMap<>();
+        String output = "";
+        for (int start = 0, end = 0; end < input.length(); end++) {
+            char currChar = input.charAt(end);
+            if (visited.containsKey(currChar)) {
+                start = Math.max(visited.get(currChar) + 1, start);
+            }
+            if (output.length() < end - start + 1) {
+                output = input.substring(start, end + 1);
+            }
+            visited.put(currChar, end);
+        }
+        return output;
+    }
+
+    public static void main(String[] args) {
+        if(args.length > 0) {
+            System.out.println(getUniqueCharacterSubstring(args[0]));
+        } else {
+            System.err.println("This program expects command-line input. Please try again!");
+        }
+    }
+
+}

algorithms-miscellaneous-1/src/main/java/com/baeldung/algorithms/string/SubstringPalindrome.java

@@ -0,0 +1,90 @@
+package com.baeldung.algorithms.string;
+
+import java.util.HashSet;
+import java.util.Set;
+
+public class SubstringPalindrome {
+
+    public Set<String> findAllPalindromesUsingCenter(String input) {
+        final Set<String> palindromes = new HashSet<>();
+        if (input == null || input.isEmpty()) {
+            return palindromes;
+        }
+        if (input.length() == 1) {
+            palindromes.add(input);
+            return palindromes;
+        }
+        for (int i = 0; i < input.length(); i++) {
+            palindromes.addAll(findPalindromes(input, i, i + 1));
+            palindromes.addAll(findPalindromes(input, i, i));
+        }
+        return palindromes;
+    }
+
+    private Set<String> findPalindromes(String input, int low, int high) {
+        Set<String> result = new HashSet<>();
+        while (low >= 0 && high < input.length() && input.charAt(low) == input.charAt(high)) {
+            result.add(input.substring(low, high + 1));
+            low--;
+            high++;
+        }
+        return result;
+    }
+
+    public Set<String> findAllPalindromesUsingBruteForceApproach(String input) {
+        Set<String> palindromes = new HashSet<>();
+        if (input == null || input.isEmpty()) {
+            return palindromes;
+        }
+        if (input.length() == 1) {
+            palindromes.add(input);
+            return palindromes;
+        }
+        for (int i = 0; i < input.length(); i++) {
+            for (int j = i + 1; j <= input.length(); j++)
+                if (isPalindrome(input.substring(i, j))) {
+                    palindromes.add(input.substring(i, j));
+                }
+        }
+        return palindromes;
+    }
+
+    private boolean isPalindrome(String input) {
+        StringBuilder plain = new StringBuilder(input);
+        StringBuilder reverse = plain.reverse();
+        return (reverse.toString()).equals(input);
+    }
+
+    public Set<String> findAllPalindromesUsingManachersAlgorithm(String input) {
+        Set<String> palindromes = new HashSet<>();
+        String formattedInput = "@" + input + "#";
+        char inputCharArr[] = formattedInput.toCharArray();
+        int max;
+        int radius[][] = new int[2][input.length() + 1];
+        for (int j = 0; j <= 1; j++) {
+            radius[j][0] = max = 0;
+            int i = 1;
+            while (i <= input.length()) {
+                palindromes.add(Character.toString(inputCharArr[i]));
+                while (inputCharArr[i - max - 1] == inputCharArr[i + j + max])
+                    max++;
+                radius[j][i] = max;
+                int k = 1;
+                while ((radius[j][i - k] != max - k) && (k < max)) {
+                    radius[j][i + k] = Math.min(radius[j][i - k], max - k);
+                    k++;
+                }
+                max = Math.max(max - k, 0);
+                i += k;
+            }
+        }
+        for (int i = 1; i <= input.length(); i++) {
+            for (int j = 0; j <= 1; j++) {
+                for (max = radius[j][i]; max > 0; max--) {
+                    palindromes.add(input.substring(i - max - 1, max + j + i - 1));
+                }
+            }
+        }
+        return palindromes;
+    }
+}

algorithms-miscellaneous-1/src/main/resources/maze/maze1.txt

@@ -1,12 +0,0 @@
-S ########
-#        #
-# ### ## #
-# #    # #
-# #  # # #
-# ## #####
-# #      #
-# # #  # #
-##### ####
-#   #    E
-# #    # #
-##########

algorithms-miscellaneous-1/src/main/resources/maze/maze2.txt

@@ -1,22 +0,0 @@
-S ##########################
-# #      #                 #
-# # ####   ############### #
-# # #    # #               #
-# # #### # # ###############
-# # #    # # #             #
-# # # #### ### ########### #
-# # # #        #           #
-#       ################## #
-#########    # # #       # #
-# #       #### # ####### # #
-# # ### ###  # # #       # #
-#   #       ##   # ##### # #
-##### #######  # #     # # #
-#     #       ## ## #### # #
-# ##### #######     #      #
-#       #       ############
-####### #########        # #
-#       #         ######## #
-# ####### ###### ##   #    E
-#         #         #   ## #
-############################

algorithms-miscellaneous-1/src/test/java/com/baeldung/algorithms/factorial/FactorialUnitTest.java

@@ -0,0 +1,72 @@
+package com.baeldung.algorithms.factorial;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.math.BigInteger;
+
+import org.junit.Before;
+import org.junit.Test;
+
+public class FactorialUnitTest {
+
+    Factorial factorial;
+
+    @Before
+    public void setup() {
+        factorial = new Factorial();
+    }
+
+    @Test
+    public void whenCalculatingFactorialUsingForLoop_thenCorrect() {
+        int n = 5;
+
+        assertThat(factorial.factorialUsingForLoop(n)).isEqualTo(120);
+    }
+
+    @Test
+    public void whenCalculatingFactorialUsingStreams_thenCorrect() {
+        int n = 5;
+
+        assertThat(factorial.factorialUsingStreams(n)).isEqualTo(120);
+    }
+
+    @Test
+    public void whenCalculatingFactorialUsingRecursion_thenCorrect() {
+        int n = 5;
+
+        assertThat(factorial.factorialUsingRecursion(n)).isEqualTo(120);
+    }
+
+    @Test
+    public void whenCalculatingFactorialUsingMemoize_thenCorrect() {
+        int n = 5;
+
+        assertThat(factorial.factorialUsingMemoize(n)).isEqualTo(120);
+
+        n = 6;
+
+        assertThat(factorial.factorialUsingMemoize(n)).isEqualTo(720);
+    }
+
+    @Test
+    public void whenCalculatingFactorialHavingLargeResult_thenCorrect() {
+        int n = 22;
+
+        assertThat(factorial.factorialHavingLargeResult(n)).isEqualTo(new BigInteger("1124000727777607680000"));
+    }
+
+    @Test
+    public void whenCalculatingFactorialUsingApacheCommons_thenCorrect() {
+        int n = 5;
+
+        assertThat(factorial.factorialUsingApacheCommons(n)).isEqualTo(120);
+    }
+
+    @Test
+    public void whenCalculatingFactorialUsingGuava_thenCorrect() {
+        int n = 22;
+
+        assertThat(factorial.factorialUsingGuava(n)).isEqualTo(new BigInteger("1124000727777607680000"));
+    }
+
+}

algorithms-miscellaneous-1/src/test/java/com/baeldung/algorithms/string/LongestSubstringNonRepeatingCharactersUnitTest.java

@@ -0,0 +1,31 @@
+package com.baeldung.algorithms.string;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static com.baeldung.algorithms.string.LongestSubstringNonRepeatingCharacters.getUniqueCharacterSubstring;
+import static com.baeldung.algorithms.string.LongestSubstringNonRepeatingCharacters.getUniqueCharacterSubstringBruteForce;
+
+public class LongestSubstringNonRepeatingCharactersUnitTest {
+
+    @Test
+    void givenString_whenGetUniqueCharacterSubstringBruteForceCalled_thenResultFoundAsExpectedUnitTest() {
+        assertEquals("", getUniqueCharacterSubstringBruteForce(""));
+        assertEquals("A", getUniqueCharacterSubstringBruteForce("A"));
+        assertEquals("ABCDEF", getUniqueCharacterSubstringBruteForce("AABCDEF"));
+        assertEquals("ABCDEF", getUniqueCharacterSubstringBruteForce("ABCDEFF"));
+        assertEquals("NGISAWE", getUniqueCharacterSubstringBruteForce("CODINGISAWESOME"));
+        assertEquals("be coding", getUniqueCharacterSubstringBruteForce("always be coding"));
+    }
+
+    @Test
+    void givenString_whenGetUniqueCharacterSubstringCalled_thenResultFoundAsExpectedUnitTest() {
+        assertEquals("", getUniqueCharacterSubstring(""));
+        assertEquals("A", getUniqueCharacterSubstring("A"));
+        assertEquals("ABCDEF", getUniqueCharacterSubstring("AABCDEF"));
+        assertEquals("ABCDEF", getUniqueCharacterSubstring("ABCDEFF"));
+        assertEquals("NGISAWE", getUniqueCharacterSubstring("CODINGISAWESOME"));
+        assertEquals("be coding", getUniqueCharacterSubstring("always be coding"));
+    }
+
+}

algorithms-miscellaneous-1/src/test/java/com/baeldung/algorithms/string/SubstringPalindromeUnitTest.java

@@ -0,0 +1,83 @@
+package com.baeldung.algorithms.string;
+
+import static org.junit.Assert.assertEquals;
+import java.util.HashSet;
+import java.util.Set;
+import org.junit.Test;
+
+public class SubstringPalindromeUnitTest {
+
+    private static final String INPUT_BUBBLE = "bubble";
+    private static final String INPUT_CIVIC = "civic";
+    private static final String INPUT_INDEED = "indeed";
+    private static final String INPUT_ABABAC = "ababac";
+
+    Set<String> EXPECTED_PALINDROME_BUBBLE = new HashSet<String>() {
+        {
+            add("b");
+            add("u");
+            add("l");
+            add("e");
+            add("bb");
+            add("bub");
+        }
+    };
+
+    Set<String> EXPECTED_PALINDROME_CIVIC = new HashSet<String>() {
+        {
+            add("civic");
+            add("ivi");
+            add("i");
+            add("c");
+            add("v");
+        }
+    };
+
+    Set<String> EXPECTED_PALINDROME_INDEED = new HashSet<String>() {
+        {
+            add("i");
+            add("n");
+            add("d");
+            add("e");
+            add("ee");
+            add("deed");
+        }
+    };
+
+    Set<String> EXPECTED_PALINDROME_ABABAC = new HashSet<String>() {
+        {
+            add("a");
+            add("b");
+            add("c");
+            add("aba");
+            add("bab");
+            add("ababa");
+        }
+    };
+
+    private SubstringPalindrome palindrome = new SubstringPalindrome();
+
+    @Test
+    public void whenUsingManachersAlgorithm_thenFindsAllPalindromes() {
+        assertEquals(EXPECTED_PALINDROME_BUBBLE, palindrome.findAllPalindromesUsingManachersAlgorithm(INPUT_BUBBLE));
+        assertEquals(EXPECTED_PALINDROME_INDEED, palindrome.findAllPalindromesUsingManachersAlgorithm(INPUT_INDEED));
+        assertEquals(EXPECTED_PALINDROME_CIVIC, palindrome.findAllPalindromesUsingManachersAlgorithm(INPUT_CIVIC));
+        assertEquals(EXPECTED_PALINDROME_ABABAC, palindrome.findAllPalindromesUsingManachersAlgorithm(INPUT_ABABAC));
+    }
+
+    @Test
+    public void whenUsingCenterApproach_thenFindsAllPalindromes() {
+        assertEquals(EXPECTED_PALINDROME_BUBBLE, palindrome.findAllPalindromesUsingCenter(INPUT_BUBBLE));
+        assertEquals(EXPECTED_PALINDROME_INDEED, palindrome.findAllPalindromesUsingCenter(INPUT_INDEED));
+        assertEquals(EXPECTED_PALINDROME_CIVIC, palindrome.findAllPalindromesUsingCenter(INPUT_CIVIC));
+        assertEquals(EXPECTED_PALINDROME_ABABAC, palindrome.findAllPalindromesUsingCenter(INPUT_ABABAC));
+    }
+
+    @Test
+    public void whenUsingBruteForceApproach_thenFindsAllPalindromes() {
+        assertEquals(EXPECTED_PALINDROME_BUBBLE, palindrome.findAllPalindromesUsingBruteForceApproach(INPUT_BUBBLE));
+        assertEquals(EXPECTED_PALINDROME_INDEED, palindrome.findAllPalindromesUsingBruteForceApproach(INPUT_INDEED));
+        assertEquals(EXPECTED_PALINDROME_CIVIC, palindrome.findAllPalindromesUsingBruteForceApproach(INPUT_CIVIC));
+        assertEquals(EXPECTED_PALINDROME_ABABAC, palindrome.findAllPalindromesUsingBruteForceApproach(INPUT_ABABAC));
+    }
+}

algorithms-miscellaneous-2/README.md

@@ -10,7 +10,6 @@
 - [A Collaborative Filtering Recommendation System in Java](http://www.baeldung.com/java-collaborative-filtering-recommendations)
 - [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)
 - [An Introduction to the Theory of Big-O Notation](http://www.baeldung.com/big-o-notation)
 - [Check If Two Rectangles Overlap In Java](https://www.baeldung.com/java-check-if-two-rectangles-overlap)
 - [Calculate the Distance Between Two Points in Java](https://www.baeldung.com/java-distance-between-two-points)
@@ -18,3 +17,4 @@
 - [Round Up to the Nearest Hundred](https://www.baeldung.com/java-round-up-nearest-hundred)
 - [Calculate Percentage in Java](https://www.baeldung.com/java-calculate-percentage)
 - [Converting Between Byte Arrays and Hexadecimal Strings in Java](https://www.baeldung.com/java-byte-arrays-hex-strings)
+- [Convert Latitude and Longitude to a 2D Point in Java](https://www.baeldung.com/java-convert-latitude-longitude)

algorithms-miscellaneous-2/pom.xml

@@ -1,9 +1,9 @@
 <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>algorithms-miscellaneous-2</artifactId>
     <version>0.0.1-SNAPSHOT</version>
+    <name>algorithms-miscellaneous-2</name>
 
     <parent>
         <groupId>com.baeldung</groupId>
@@ -33,6 +33,11 @@
             <artifactId>jgrapht-core</artifactId>
             <version>${org.jgrapht.core.version}</version>
         </dependency>
+        <dependency>
+        	<groupId>org.jgrapht</groupId>
+        	<artifactId>jgrapht-ext</artifactId>
+        	<version>${org.jgrapht.ext.version}</version>
+        </dependency>
         <dependency>
             <groupId>pl.allegro.finance</groupId>
             <artifactId>tradukisto</artifactId>
@@ -83,6 +88,7 @@
         <commons-math3.version>3.6.1</commons-math3.version>
         <tradukisto.version>1.0.1</tradukisto.version>
         <org.jgrapht.core.version>1.0.1</org.jgrapht.core.version>
+        <org.jgrapht.ext.version>1.0.1</org.jgrapht.ext.version>
         <org.assertj.core.version>3.9.0</org.assertj.core.version>
         <commons-codec.version>1.11</commons-codec.version>
     </properties>

algorithms-miscellaneous-2/roundUpToHundred/.gitignore

@@ -1 +0,0 @@
-/bin/

algorithms-miscellaneous-2/roundUpToHundred/src/com/java/src/RoundUpToHundred.java

@@ -1,20 +0,0 @@
-package com.java.src;
-
-import java.util.Scanner;
-
-public class RoundUpToHundred {
-
-    public static void main(String[] args) {
-        Scanner scanner = new Scanner(System.in);
-        double input = scanner.nextDouble();
-        scanner.close();
-
-        RoundUpToHundred.round(input);
-    }
-
-    static long round(double input) {
-        long i = (long) Math.ceil(input);
-        return ((i + 99) / 100) * 100;
-    };
-
-}

algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/RunAlgorithm.java

@@ -0,0 +1,28 @@
+package com.baeldung.algorithms;
+
+import java.util.Scanner;
+
+import com.baeldung.algorithms.slope_one.SlopeOne;
+
+public class RunAlgorithm {
+
+	public static void main(String[] args) throws InstantiationException, IllegalAccessException {
+		Scanner in = new Scanner(System.in);
+		System.out.println("1 - Slope One");
+		System.out.println("2 - Dijkstra");
+		int decision = in.nextInt();
+		switch (decision) {
+		case 1:
+			SlopeOne.slopeOne(3);
+			break;
+		case 2:
+			System.out.println("Please run the DijkstraAlgorithmLongRunningUnitTest.");
+			break;
+		default:
+			System.out.println("Unknown option");
+			break;
+		}
+		in.close();
+	}
+
+}

algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/mercator/EllipticalMercator.java

@@ -0,0 +1,22 @@
+package com.baeldung.algorithms.mercator;
+
+class EllipticalMercator extends Mercator {
+
+    @Override
+    double yAxisProjection(double input) {
+
+        input = Math.min(Math.max(input, -89.5), 89.5);
+        double earthDimensionalRateNormalized = 1.0 - Math.pow(RADIUS_MINOR / RADIUS_MAJOR, 2);
+
+        double inputOnEarthProj = Math.sqrt(earthDimensionalRateNormalized) *  Math.sin( Math.toRadians(input));
+
+        inputOnEarthProj = Math.pow(((1.0 - inputOnEarthProj)/(1.0+inputOnEarthProj)), 0.5 * Math.sqrt(earthDimensionalRateNormalized));
+        double inputOnEarthProjNormalized = Math.tan(0.5 * ((Math.PI*0.5) -  Math.toRadians(input)))/inputOnEarthProj;
+        return (-1) * RADIUS_MAJOR * Math.log(inputOnEarthProjNormalized);
+    }
+
+    @Override
+    double xAxisProjection(double input) {
+        return RADIUS_MAJOR * Math.toRadians(input);
+    }
+}

algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/mercator/Mercator.java

@@ -0,0 +1,10 @@
+package com.baeldung.algorithms.mercator;
+
+abstract class Mercator {
+    final static double RADIUS_MAJOR = 6378137.0;
+    final static double RADIUS_MINOR = 6356752.3142;
+
+    abstract double yAxisProjection(double input);
+
+    abstract double xAxisProjection(double input);
+}

algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/mercator/SphericalMercator.java

@@ -0,0 +1,14 @@
+package com.baeldung.algorithms.mercator;
+
+public class SphericalMercator extends  Mercator {
+
+    @Override
+    double xAxisProjection(double input) {
+        return Math.toRadians(input) * RADIUS_MAJOR;
+    }
+
+    @Override
+    double yAxisProjection(double input) {
+        return Math.log(Math.tan(Math.PI / 4 + Math.toRadians(input) / 2)) * RADIUS_MAJOR;
+    }
+}

algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/roundedup/RoundUpToHundred.java

@@ -1,4 +1,4 @@
-package com.java.src;
+package com.baeldung.algorithms.roundedup;
 
 import java.util.Scanner;
 

algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/mercator/EllipticalMercatorUnitTest.java

@@ -0,0 +1,22 @@
+package com.baeldung.algorithms.mercator;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+
+public class EllipticalMercatorUnitTest {
+
+    @Test
+    public void giventThatTheInputIs22_whenXAxisProjectionIsCalled_thenTheResultIsTheCorrectOne() {
+        Mercator mercator = new EllipticalMercator();
+        double result = mercator.xAxisProjection(22);
+        Assert.assertEquals(result, 2449028.7974520186, 0.0);
+    }
+
+    @Test
+    public void giventThatTheInputIs44_whenYAxisProjectionIsCalled_thenTheResultIsTheCorrectOne() {
+        Mercator mercator = new EllipticalMercator();
+        double result = mercator.yAxisProjection(44);
+        Assert.assertEquals(result, 5435749.887511954, 0.0);
+    }
+}

algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/mercator/SphericalMercatorUnitTest.java

@@ -0,0 +1,21 @@
+package com.baeldung.algorithms.mercator;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class SphericalMercatorUnitTest {
+
+    @Test
+    public void giventThatTheInputIs22_whenXAxisProjectionIsCalled_thenTheResultIsTheCorrectOne() {
+        Mercator mercator = new SphericalMercator();
+        double result = mercator.xAxisProjection(22);
+        Assert.assertEquals(result, 2449028.7974520186, 0.0);
+    }
+
+    @Test
+    public void giventThatTheInputIs44_whenYAxisProjectionIsCalled_thenTheResultIsTheCorrectOne() {
+        Mercator mercator = new SphericalMercator();
+        double result = mercator.yAxisProjection(44);
+        Assert.assertEquals(result, 5465442.183322753, 0.0);
+    }
+}

algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/roundedup/RoundUpToHundredUnitTest.java

@@ -1,10 +1,10 @@
-package com.java.src;
+package com.baeldung.algorithms.roundedup;
 
 import static org.junit.Assert.assertEquals;
 
 import org.junit.Test;
 
-public class RoundUpToHundredTest {
+public class RoundUpToHundredUnitTest {
     @Test
     public void givenInput_whenRound_thenRoundUpToTheNearestHundred() {
         assertEquals("Rounded up to hundred", 100, RoundUpToHundred.round(99));

algorithms-miscellaneous-2/src/test/java/com/baeldung/jgrapht/GraphImageGenerationUnitTest.java

@@ -0,0 +1,47 @@
+package com.baeldung.jgrapht;
+
+import static org.junit.Assert.assertTrue;
+import java.awt.Color;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import javax.imageio.ImageIO;
+import org.jgrapht.ext.JGraphXAdapter;
+import org.jgrapht.graph.DefaultDirectedGraph;
+import org.jgrapht.graph.DefaultEdge;
+import org.junit.Before;
+import org.junit.Test;
+import com.mxgraph.layout.mxCircleLayout;
+import com.mxgraph.layout.mxIGraphLayout;
+import com.mxgraph.util.mxCellRenderer;
+
+public class GraphImageGenerationUnitTest {
+    static DefaultDirectedGraph<String, DefaultEdge> g;
+
+    @Before
+    public void createGraph() throws IOException {
+        File imgFile = new File("src/test/resources/graph.png");
+        imgFile.createNewFile();
+        g = new DefaultDirectedGraph<String, DefaultEdge>(DefaultEdge.class);
+        String x1 = "x1";
+        String x2 = "x2";
+        String x3 = "x3";
+        g.addVertex(x1);
+        g.addVertex(x2);
+        g.addVertex(x3);
+        g.addEdge(x1, x2);
+        g.addEdge(x2, x3);
+        g.addEdge(x3, x1);
+    }
+
+    @Test
+    public void givenAdaptedGraph_whenWriteBufferedImage_ThenFileShouldExist() throws IOException {
+        JGraphXAdapter<String, DefaultEdge> graphAdapter = new JGraphXAdapter<String, DefaultEdge>(g);
+        mxIGraphLayout layout = new mxCircleLayout(graphAdapter);
+        layout.execute(graphAdapter.getDefaultParent());
+        File imgFile = new File("src/test/resources/graph.png");
+        BufferedImage image = mxCellRenderer.createBufferedImage(graphAdapter, null, 2, Color.WHITE, true, null);
+        ImageIO.write(image, "PNG", imgFile);
+        assertTrue(imgFile.exists());
+    }
+}

algorithms-sorting/README.md

@@ -4,4 +4,4 @@
 - [Merge Sort in Java](https://www.baeldung.com/java-merge-sort)
 - [Quicksort Algorithm Implementation in Java](https://www.baeldung.com/java-quicksort)
 - [Insertion Sort in Java](https://www.baeldung.com/java-insertion-sort)
-
+- [Heap Sort in Java](https://www.baeldung.com/java-heap-sort)

algorithms-sorting/pom.xml

@@ -1,9 +1,9 @@
 <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>algorithms-sorting</artifactId>
     <version>0.0.1-SNAPSHOT</version>
+    <name>algorithms-sorting</name>
 
     <parent>
         <groupId>com.baeldung</groupId>

algorithms-sorting/roundUpToHundred/.gitignore

@@ -1 +0,0 @@
-/bin/

algorithms-sorting/roundUpToHundred/src/com/java/src/RoundUpToHundred.java

@@ -1,20 +0,0 @@
-package com.java.src;
-
-import java.util.Scanner;
-
-public class RoundUpToHundred {
-
-    public static void main(String[] args) {
-        Scanner scanner = new Scanner(System.in);
-        double input = scanner.nextDouble();
-        scanner.close();
-
-        RoundUpToHundred.round(input);
-    }
-
-    static long round(double input) {
-        long i = (long) Math.ceil(input);
-        return ((i + 99) / 100) * 100;
-    };
-
-}

algorithms-sorting/roundUpToHundred/src/com/java/src/RoundUpToHundredTest.java

@@ -1,14 +0,0 @@
-package com.java.src;
-
-import static org.junit.Assert.assertEquals;
-
-import org.junit.Test;
-
-public class RoundUpToHundredTest {
-    @Test
-    public void givenInput_whenRound_thenRoundUpToTheNearestHundred() {
-        assertEquals("Rounded up to hundred", 100, RoundUpToHundred.round(99));
-        assertEquals("Rounded up to three hundred ", 300, RoundUpToHundred.round(200.2));
-        assertEquals("Returns same rounded value", 400, RoundUpToHundred.round(400));
-    }
-}

algorithms-sorting/src/main/java/com/baeldung/algorithms/mergesort/MergeSort.java

@@ -34,7 +34,7 @@ public class MergeSort {
 
         while (i < left && j < right) {
 
-            if (l[i] < r[j])
+            if (l[i] <= r[j])
                 a[k++] = l[i++];
             else
                 a[k++] = r[j++];

annotations/annotation-processing/pom.xml

@@ -3,7 +3,8 @@
     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>
-
+    <name>annotation-processing</name>
+    
     <parent>
         <groupId>com.baeldung</groupId>
         <version>1.0.0-SNAPSHOT</version>

annotations/annotation-user/pom.xml

@@ -3,6 +3,7 @@
     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-user</artifactId>
+    <name>annotation-user</name>
 
     <parent>
         <artifactId>annotations</artifactId>

annotations/pom.xml

@@ -4,7 +4,8 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>annotations</artifactId>
     <packaging>pom</packaging>
-
+    <name>annotations</name>
+    
     <parent>
         <artifactId>parent-modules</artifactId>
         <groupId>com.baeldung</groupId>

apache-avro/pom.xml

@@ -3,10 +3,9 @@
          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-avro</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-	<name>Apache Avro</name>
+	<name>apache-avro</name>
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

apache-bval/pom.xml

@@ -4,7 +4,8 @@
     <groupId>apache-bval</groupId>
     <artifactId>apache-bval</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-
+    <name>apache-bval</name>
+    
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>parent-modules</artifactId>

apache-curator/pom.xml

@@ -4,6 +4,7 @@
     <artifactId>apache-curator</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>jar</packaging>
+	<name>apache-curator</name>
 
     <parent>
         <groupId>com.baeldung</groupId>

apache-cxf/cxf-aegis/pom.xml

@@ -2,7 +2,8 @@
     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>cxf-aegis</artifactId>
-
+	<name>cxf-aegis</name>
+	
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>apache-cxf</artifactId>

apache-cxf/cxf-introduction/pom.xml

@@ -4,7 +4,8 @@
     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>cxf-introduction</artifactId>
-
+	<name>cxf-introduction</name>
+	
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>apache-cxf</artifactId>

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

@@ -4,7 +4,8 @@
     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>cxf-jaxrs-implementation</artifactId>
-
+	<name>cxf-jaxrs-implementation</name>
+	
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>apache-cxf</artifactId>

apache-cxf/cxf-spring/pom.xml

@@ -3,6 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>cxf-spring</artifactId>
     <packaging>war</packaging>
+	<name>cxf-spring</name>
 
     <parent>
         <groupId>com.baeldung</groupId>

apache-cxf/pom.xml

@@ -1,9 +1,9 @@
 <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-cxf</artifactId>
     <version>0.0.1-SNAPSHOT</version>
+    <name>apache-cxf</name>
     <packaging>pom</packaging>
 
     <parent>

apache-cxf/sse-jaxrs/pom.xml

@@ -3,8 +3,8 @@
          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>
-
     <artifactId>sse-jaxrs</artifactId>
+    <name>sse-jaxrs</name>
     <packaging>pom</packaging>
 
     <parent>

apache-cxf/sse-jaxrs/sse-jaxrs-client/pom.xml

@@ -3,15 +3,15 @@
          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>
-
+    <artifactId>sse-jaxrs-client</artifactId>
+    <name>sse-jaxrs-client</name>
+    
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>sse-jaxrs</artifactId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>
 
-    <artifactId>sse-jaxrs-client</artifactId>
-
     <properties>
         <cxf-version>3.2.0</cxf-version>
     </properties>
@@ -21,7 +21,6 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
-                <version>1.6.0</version>
                 <executions>
                     <execution>
                         <id>singleEvent</id>

apache-cxf/sse-jaxrs/sse-jaxrs-server/pom.xml

@@ -3,16 +3,16 @@
          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>
-
+    <artifactId>sse-jaxrs-server</artifactId>
+    <name>sse-jaxrs-server</name>
+    <packaging>war</packaging>
+    
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>sse-jaxrs</artifactId>
         <version>0.0.1-SNAPSHOT</version>
     </parent>
 
-    <artifactId>sse-jaxrs-server</artifactId>
-    <packaging>war</packaging>
-
     <properties>
         <liberty-maven-plugin.version>2.4.2</liberty-maven-plugin.version>
         <failOnMissingWebXml>false</failOnMissingWebXml>

apache-geode/pom.xml

@@ -3,11 +3,10 @@
          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-geode</artifactId>
     <version>1.0-SNAPSHOT</version>
-
+    <name>apache-geode</name>
+    
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>parent-modules</artifactId>

apache-opennlp/pom.xml

@@ -4,6 +4,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>apache-opennlp</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <name>apache-opennlp</name>
     <packaging>jar</packaging>
 
     <parent>

apache-poi/pom.xml

@@ -1,9 +1,9 @@
 <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-poi</artifactId>
     <version>0.0.1-SNAPSHOT</version>
+    <name>apache-poi</name>
 
     <parent>
         <groupId>com.baeldung</groupId>

apache-pulsar/README.md

@@ -0,0 +1,3 @@
+### Relevant Articles: 
+
+- [Introduction to Apache Pulsar](https://www.baeldung.com/apache-pulsar)

apache-pulsar/pom.xml

@@ -1,21 +1,22 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
-  <modelVersion>4.0.0</modelVersion>
+    <modelVersion>4.0.0</modelVersion>
-  <groupId>com.baeldung.pulsar</groupId>
+    <groupId>com.baeldung.pulsar</groupId>
-  <artifactId>pulsar-java</artifactId>
+    <artifactId>apache-pulsar</artifactId>
-  <version>0.0.1</version>
+    <version>0.0.1</version>
+    <name>apache-pulsar</name>
 
-  <dependencies>
+    <dependencies>
-    <dependency>
+        <dependency>
-      <groupId>org.apache.pulsar</groupId>
+            <groupId>org.apache.pulsar</groupId>
-      <artifactId>pulsar-client</artifactId>
+            <artifactId>pulsar-client</artifactId>
-      <version>2.1.1-incubating</version>
+            <version>2.1.1-incubating</version>
-      <scope>compile</scope>
+            <scope>compile</scope>
-    </dependency>
+        </dependency>
-  </dependencies>
+    </dependencies>
-  <properties>
+    <properties>
-    <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.target>1.8</maven.compiler.target>
-    <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.source>1.8</maven.compiler.source>
-  </properties>
+    </properties>
 </project>

apache-shiro/pom.xml

@@ -5,7 +5,8 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>apache-shiro</artifactId>
     <version>1.0-SNAPSHOT</version>
-
+    <name>apache-shiro</name>
+    
     <parent>
         <artifactId>parent-boot-1</artifactId>
         <groupId>com.baeldung</groupId>

apache-thrift/pom.xml

@@ -1,9 +1,9 @@
 <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-thrift</artifactId>
     <version>0.0.1-SNAPSHOT</version>
+    <name>apache-thrift</name>
     <packaging>pom</packaging>
 
     <parent>

apache-tika/pom.xml

@@ -1,10 +1,10 @@
 <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-tika</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-
+    <name>apache-tika</name>
+    
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>parent-modules</artifactId>

apache-zookeeper/pom.xml

@@ -1,9 +1,9 @@
 <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-zookeeper</artifactId>
     <version>0.0.1-SNAPSHOT</version>
+    <name>apache-zookeeper</name>
     <packaging>jar</packaging>
 
     <parent>

asm/pom.xml

@@ -5,6 +5,7 @@
     <groupId>com.baeldung.examples</groupId>
     <artifactId>asm</artifactId>
     <version>1.0</version>
+    <name>asm</name>
     <packaging>jar</packaging>
 
     <parent>

atomix/pom.xml

@@ -4,7 +4,8 @@
     <groupId>com.atomix.io</groupId>
     <artifactId>atomix</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-
+    <name>atomix</name>
+    
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>parent-modules</artifactId>

axon/pom.xml

@@ -3,7 +3,8 @@
     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>axon</artifactId>
-
+    <name>axon</name>
+        
     <parent>
         <artifactId>parent-modules</artifactId>
         <groupId>com.baeldung</groupId>

cas/cas-server/pom.xml

@@ -3,8 +3,9 @@
     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>cas-server</artifactId>
-    <packaging>war</packaging>
     <version>1.0</version>
+    <name>cas-server</name>
+    <packaging>war</packaging>
 
     <parent>
         <artifactId>parent-boot-1</artifactId>

cdi-portable-extension/flyway-cdi/pom.xml

@@ -1,38 +0,0 @@
-<?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">
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>flyway-cdi</artifactId>
-
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>cdi-portable-extension</artifactId>
-        <version>1.0-SNAPSHOT</version>
-    </parent>
-
-    <dependencies>
-        <dependency>
-            <groupId>javax.enterprise</groupId>
-            <artifactId>cdi-api</artifactId>
-            <version>2.0.SP1</version>
-        </dependency>
-        <dependency>
-            <groupId>org.flywaydb</groupId>
-            <artifactId>flyway-core</artifactId>
-            <version>5.1.4</version>
-        </dependency>
-        <dependency>
-            <groupId>org.apache.tomcat</groupId>
-            <artifactId>tomcat-jdbc</artifactId>
-            <version>8.5.33</version>
-        </dependency>
-        <dependency>
-            <groupId>javax.annotation</groupId>
-            <artifactId>javax.annotation-api</artifactId>
-            <version>1.3.2</version>
-        </dependency>
-    </dependencies>
-
-</project>

cdi-portable-extension/flyway-cdi/src/main/java/com/baeldung/cdi/extension/FlywayExtension.java

@@ -1,74 +0,0 @@
-package com.baeldung.cdi.extension;
-
-import org.apache.tomcat.jdbc.pool.DataSource;
-import org.flywaydb.core.Flyway;
-
-import javax.annotation.sql.DataSourceDefinition;
-import javax.enterprise.context.ApplicationScoped;
-import javax.enterprise.event.Observes;
-import javax.enterprise.inject.Any;
-import javax.enterprise.inject.Default;
-import javax.enterprise.inject.literal.InjectLiteral;
-import javax.enterprise.inject.spi.*;
-import javax.enterprise.util.AnnotationLiteral;
-
-
-/**
- * Flyway is now under CDI container like:
- *
- * @ApplicationScoped
- * @FlywayType public class Flyway{
- * @Inject setDataSource(DataSource dataSource){
- * //...
- * }
- * }
- */
-
-public class FlywayExtension implements Extension {
-
-    DataSourceDefinition dataSourceDefinition = null;
-
-    public void registerFlywayType(@Observes BeforeBeanDiscovery bbdEvent) {
-        bbdEvent.addAnnotatedType(Flyway.class, Flyway.class.getName());
-    }
-
-    public void detectDataSourceDefinition(@Observes @WithAnnotations(DataSourceDefinition.class) ProcessAnnotatedType<?> patEvent) {
-        AnnotatedType at = patEvent.getAnnotatedType();
-        dataSourceDefinition = at.getAnnotation(DataSourceDefinition.class);
-    }
-
-    public void processAnnotatedType(@Observes ProcessAnnotatedType<Flyway> patEvent) {
-        patEvent.configureAnnotatedType()
-                //Add Scope
-                .add(ApplicationScoped.Literal.INSTANCE)
-                //Add Qualifier
-                .add(new AnnotationLiteral<FlywayType>() {
-                })
-                //Decorate setDataSource(DataSource dataSource){} with @Inject
-                .filterMethods(annotatedMethod -> {
-                    return annotatedMethod.getParameters().size() == 1 &&
-                            annotatedMethod.getParameters().get(0).getBaseType().equals(javax.sql.DataSource.class);
-                })
-                .findFirst().get().add(InjectLiteral.INSTANCE);
-    }
-
-    void afterBeanDiscovery(@Observes AfterBeanDiscovery abdEvent, BeanManager bm) {
-        abdEvent.addBean()
-                .types(javax.sql.DataSource.class, DataSource.class)
-                .qualifiers(new AnnotationLiteral<Default>() {}, new AnnotationLiteral<Any>() {})
-                .scope(ApplicationScoped.class)
-                .name(DataSource.class.getName())
-                .beanClass(DataSource.class)
-                .createWith(creationalContext -> {
-                    DataSource instance = new DataSource();
-                    instance.setUrl(dataSourceDefinition.url());
-                    instance.setDriverClassName(dataSourceDefinition.className());
-                    return instance;
-                });
-    }
-
-    void runFlywayMigration(@Observes AfterDeploymentValidation adv, BeanManager manager) {
-        Flyway flyway = manager.createInstance().select(Flyway.class, new AnnotationLiteral<FlywayType>() {}).get();
-        flyway.migrate();
-    }
-}

cdi-portable-extension/flyway-cdi/src/main/java/com/baeldung/cdi/extension/FlywayType.java

@@ -1,14 +0,0 @@
-package com.baeldung.cdi.extension;
-
-import javax.inject.Qualifier;
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
-import java.lang.annotation.Target;
-
-import static java.lang.annotation.ElementType.*;
-
-@Retention(RetentionPolicy.RUNTIME)
-@Target({FIELD, METHOD, PARAMETER, TYPE})
-@Qualifier
-public @interface FlywayType {
-}

cdi-portable-extension/flyway-cdi/src/main/resources/META-INF/beans.xml

@@ -1,6 +0,0 @@
-<beans version="2.0" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
-       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-       xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
-		http://xmlns.jcp.org/xml/ns/javaee/beans_2_0.xsd"
-       bean-discovery-mode="annotated">
-</beans>

cdi-portable-extension/flyway-cdi/src/main/resources/META-INF/services/javax.enterprise.inject.spi.Extension

@@ -1,2 +0,0 @@
-com.baeldung.cdi.extension.FlywayExtension
-

cdi-portable-extension/main-app/pom.xml

@@ -1,52 +0,0 @@
-<?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">
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>main-app</artifactId>
-    <packaging>jar</packaging>
-
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>cdi-portable-extension</artifactId>
-        <version>1.0-SNAPSHOT</version>
-    </parent>
-
-    <dependencies>
-
-        <dependency>
-            <groupId>javax.enterprise</groupId>
-            <artifactId>cdi-api</artifactId>
-            <version>2.0.SP1</version>
-        </dependency>
-        <dependency>
-            <groupId>org.jboss.weld.se</groupId>
-            <artifactId>weld-se-core</artifactId>
-            <version>3.0.5.Final</version>
-            <scope>runtime</scope>
-        </dependency>
-
-        <dependency>
-            <groupId>com.baeldung</groupId>
-            <artifactId>flyway-cdi</artifactId>
-            <version>1.0-SNAPSHOT</version>
-            <scope>runtime</scope>
-        </dependency>
-
-        <dependency>
-            <groupId>com.h2database</groupId>
-            <artifactId>h2</artifactId>
-            <version>1.4.197</version>
-            <scope>runtime</scope>
-        </dependency>
-
-        <dependency>
-            <groupId>javax.annotation</groupId>
-            <artifactId>javax.annotation-api</artifactId>
-            <version>1.3.2</version>
-        </dependency>
-
-    </dependencies>
-
-</project>

cdi-portable-extension/main-app/src/main/java/com/baeldung/cdi/extension/MainApp.java

@@ -1,16 +0,0 @@
-package com.baeldung.cdi.extension;
-
-import javax.annotation.sql.DataSourceDefinition;
-import javax.enterprise.context.ApplicationScoped;
-import javax.enterprise.inject.se.SeContainer;
-import javax.enterprise.inject.se.SeContainerInitializer;
-
-@ApplicationScoped
-@DataSourceDefinition(name = "ds", className = "org.h2.Driver", url = "jdbc:h2:mem:testdb")
-public class MainApp {
-    public static void main(String[] args) {
-        SeContainerInitializer initializer = SeContainerInitializer.newInstance();
-        try (SeContainer container = initializer.initialize()) {
-        }
-    }
-}

cdi-portable-extension/main-app/src/main/resources/META-INF/beans.xml

@@ -1,6 +0,0 @@
-<beans version="2.0" xmlns="http://xmlns.jcp.org/xml/ns/javaee"
-       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-       xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
-		http://xmlns.jcp.org/xml/ns/javaee/beans_2_0.xsd"
-       bean-discovery-mode="annotated">
-</beans>

cdi-portable-extension/main-app/src/main/resources/db/migration/V1__Create_person_table.sql

@@ -1,4 +0,0 @@
-create table PERSON (
-    ID int not null,
-    NAME varchar(100) not null
-);

cdi-portable-extension/main-app/src/main/resources/db/migration/V2__Add_people.sql

@@ -1,3 +0,0 @@
-insert into PERSON (ID, NAME) values (1, 'Axel');
-insert into PERSON (ID, NAME) values (2, 'Mr. Foo');
-insert into PERSON (ID, NAME) values (3, 'Ms. Bar');

cdi-portable-extension/pom.xml

@@ -1,30 +0,0 @@
-<?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">
-    <modelVersion>4.0.0</modelVersion>
-
-    <groupId>com.baeldung</groupId>
-    <artifactId>cdi-portable-extension</artifactId>
-    <version>1.0-SNAPSHOT</version>
-    <packaging>pom</packaging>
-
-    <properties>
-        <maven.compiler.source>1.8</maven.compiler.source>
-        <maven.compiler.target>1.8</maven.compiler.target>
-    </properties>
-
-    <modules>
-        <module>main-app</module>
-        <module>flyway-cdi</module>
-    </modules>
-
-    <dependencies>
-        <dependency>
-            <groupId>javax.enterprise</groupId>
-            <artifactId>cdi-api</artifactId>
-            <version>2.0.SP1</version>
-        </dependency>
-    </dependencies>
-
-</project>

cdi/README.md

@@ -1,3 +1,5 @@
 ### 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)
+- [Introduction to the Event Notification Model in CDI 2.0](https://www.baeldung.com/cdi-event-notification)
+

cdi/pom.xml

@@ -2,10 +2,10 @@
 <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>cdi</artifactId>
     <version>1.0-SNAPSHOT</version>
-
+    <name>cdi</name>
+    
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>parent-spring-4</artifactId>
@@ -14,6 +14,16 @@
     </parent>
 
     <dependencies>
+        <dependency>
+            <groupId>javax.enterprise</groupId>
+            <artifactId>cdi-api</artifactId>
+            <version>${cdi-api.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.jboss.weld.se</groupId>
+            <artifactId>weld-se-core</artifactId>
+            <version>${weld-se-core.version}</version>
+        </dependency>  
         <dependency>
             <groupId>org.hamcrest</groupId>
             <artifactId>hamcrest-core</artifactId>
@@ -42,11 +52,6 @@
             <artifactId>aspectjweaver</artifactId>
             <version>${aspectjweaver.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.jboss.weld.se</groupId>
-            <artifactId>weld-se-core</artifactId>
-            <version>${weld-se-core.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-test</artifactId>
@@ -54,13 +59,13 @@
             <scope>test</scope>
         </dependency>
     </dependencies>
-
     <properties>
-        <aspectjweaver.version>1.8.9</aspectjweaver.version>
+        <cdi-api.version>2.0.SP1</cdi-api.version>
-        <weld-se-core.version>2.4.1.Final</weld-se-core.version>
+        <weld-se-core.version>3.0.5.Final</weld-se-core.version>
+        <aspectjweaver.version>1.9.2</aspectjweaver.version>
         <hamcrest-core.version>1.3</hamcrest-core.version>
         <assertj-core.version>3.10.0</assertj-core.version>
         <junit.version>4.12</junit.version>
+        <spring.version>5.1.2.RELEASE</spring.version>
     </properties>
-
 </project>

cdi/src/main/java/com/baeldung/cdi2observers/application/BootstrappingApplication.java

@@ -0,0 +1,15 @@
+package com.baeldung.cdi.cdi2observers.application;
+
+import com.baeldung.cdi.cdi2observers.events.ExampleEvent;
+import javax.enterprise.inject.se.SeContainer;
+import javax.enterprise.inject.se.SeContainerInitializer;
+
+public class BootstrappingApplication {
+    
+    public static void main(String... args) {
+        SeContainerInitializer containerInitializer = SeContainerInitializer.newInstance();
+        try (SeContainer container = containerInitializer.initialize()) {
+            container.getBeanManager().fireEvent(new ExampleEvent("Welcome to Baeldung!"));
+        }
+    }
+}

cdi/src/main/java/com/baeldung/cdi2observers/events/ExampleEvent.java

@@ -0,0 +1,14 @@
+package com.baeldung.cdi.cdi2observers.events;
+
+public class ExampleEvent {
+    
+   private final String eventMessage;
+
+    public ExampleEvent(String eventMessage) {
+        this.eventMessage = eventMessage;
+    }
+    
+    public String getEventMessage() {
+        return eventMessage;
+    }
+}

cdi/src/main/java/com/baeldung/cdi2observers/events/ExampleEventSource.java

@@ -0,0 +1,14 @@
+package com.baeldung.cdi.cdi2observers.events;
+
+import javax.enterprise.event.Event;
+import javax.inject.Inject;
+
+public class ExampleEventSource {
+    
+    @Inject
+    Event<ExampleEvent> exampleEvent;
+    
+    public void fireEvent() {
+        exampleEvent.fireAsync(new ExampleEvent("Welcome to Baeldung!"));
+    }   
+}

cdi/src/main/java/com/baeldung/cdi2observers/observers/AnotherExampleEventObserver.java

@@ -0,0 +1,12 @@
+package com.baeldung.cdi.cdi2observers.observers;
+
+import com.baeldung.cdi.cdi2observers.events.ExampleEvent;
+import javax.annotation.Priority;
+import javax.enterprise.event.Observes;
+
+public class AnotherExampleEventObserver {
+    
+    public String onEvent(@Observes @Priority(2) ExampleEvent event) {
+        return event.getEventMessage();
+    }   
+}

cdi/src/main/java/com/baeldung/cdi2observers/observers/ExampleEventObserver.java

@@ -0,0 +1,13 @@
+package com.baeldung.cdi.cdi2observers.observers;
+
+import com.baeldung.cdi.cdi2observers.events.ExampleEvent;
+import com.baeldung.cdi.cdi2observers.services.TextService;
+import javax.annotation.Priority;
+import javax.enterprise.event.Observes;
+
+public class ExampleEventObserver {
+    
+    public String onEvent(@Observes @Priority(1) ExampleEvent event, TextService textService) {
+        return textService.parseText(event.getEventMessage());
+    } 
+}

cdi/src/main/java/com/baeldung/cdi2observers/services/TextService.java

@@ -0,0 +1,8 @@
+package com.baeldung.cdi.cdi2observers.services;
+
+public class TextService {
+
+    public String parseText(String text) {
+        return text.toUpperCase();
+    }
+}

cdi/src/test/java/com/baeldung/test/cdi2observers/tests/TextServiceUnitTest.java

@@ -0,0 +1,14 @@
+package com.baeldung.cdi.cdi2observers.tests;
+
+import com.baeldung.cdi.cdi2observers.services.TextService;
+import static org.assertj.core.api.Assertions.assertThat;
+import org.junit.Test;
+
+public class TextServiceUnitTest {
+
+    @Test
+    public void givenTextServiceInstance_whenCalledparseText_thenCorrect() {
+        TextService textService = new TextService();
+        assertThat(textService.parseText("Baeldung")).isEqualTo("BAELDUNG");
+    }
+}

core-groovy/pom.xml

@@ -4,6 +4,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>core-groovy</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <name>core-groovy</name>
     <packaging>jar</packaging>
 
     <parent>

core-java-10/README.md

@@ -4,3 +4,4 @@
 - [Java 10 LocalVariable Type-Inference](http://www.baeldung.com/java-10-local-variable-type-inference)
 - [Guide to Java 10](http://www.baeldung.com/java-10-overview)
 - [Copy a List to Another List in Java](http://www.baeldung.com/java-copy-list-to-another)
+- [Deep Dive Into the New Java JIT Compiler – Graal](https://www.baeldung.com/graal-java-jit-compiler)

core-java-11/src/main/java/com/baeldung/add

@@ -0,0 +1,12 @@
+#!/usr/local/bin/java --source 11
+
+import java.util.Arrays;
+
+public class Addition
+{
+    public static void main(String[] args) {
+        System.out.println(Arrays.stream(args)
+          .mapToInt(Integer::parseInt)
+          .sum());
+    }
+}

core-java-8/README.md

@@ -33,3 +33,4 @@
 - [An Overview of Regular Expressions Performance in Java](https://www.baeldung.com/java-regex-performance)
 - [Java Primitives versus Objects](https://www.baeldung.com/java-primitives-vs-objects)
 - [How to Use if/else Logic in Java 8 Streams](https://www.baeldung.com/java-8-streams-if-else-logic)
+- [How to Replace Many if Statements in Java](https://www.baeldung.com/java-replace-if-statements)