Merge remote-tracking branch 'upstream/master'

atomikos/pom.xml

@@ -82,26 +82,11 @@
             <artifactId>geronimo-jta_1.0.1B_spec</artifactId>
             <version>${geronimo.version}</version>
         </dependency>
-        <dependency>
-            <groupId>javax.validation</groupId>
-            <artifactId>validation-api</artifactId>
-            <version>${validation-api.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.hibernate.validator</groupId>
             <artifactId>hibernate-validator</artifactId>
             <version>${hibernate-validator.version}</version>
         </dependency>
-        <dependency>
-            <groupId>javax.el</groupId>
-            <artifactId>javax.el-api</artifactId>
-            <version>${javax.el-api.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.glassfish.web</groupId>
-            <artifactId>javax.el</artifactId>
-            <version>${javax.el.version}</version>
-        </dependency>
     </dependencies>
 
     <properties>
@@ -113,10 +98,7 @@
         <derby.version>10.8.1.2</derby.version>
         <jta.version>1.1</jta.version>
         <geronimo.version>1.0</geronimo.version>
-        <validation-api.version>2.0.1.Final</validation-api.version>
+        <hibernate-validator.version>8.0.1.Final</hibernate-validator.version>
-        <hibernate-validator.version>6.1.2.Final</hibernate-validator.version>
-        <javax.el-api.version>3.0.0</javax.el-api.version>
-        <javax.el.version>2.2.4</javax.el.version>
     </properties>
 
 </project>

atomikos/src/main/java/com/baeldung/atomikos/spring/jpa/Application.java

@@ -3,10 +3,10 @@ package com.baeldung.atomikos.spring.jpa;
 import java.util.Set;
 import java.util.UUID;
 
-import javax.validation.ConstraintViolation;
+import jakarta.validation.ConstraintViolation;
-import javax.validation.Validation;
+import jakarta.validation.Validation;
-import javax.validation.Validator;
+import jakarta.validation.Validator;
-import javax.validation.ValidatorFactory;
+import jakarta.validation.ValidatorFactory;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.transaction.annotation.Transactional;

atomikos/src/main/java/com/baeldung/atomikos/spring/jpa/order/Order.java

@@ -3,7 +3,7 @@ package com.baeldung.atomikos.spring.jpa.order;
 import javax.persistence.Entity;
 import javax.persistence.Id;
 import javax.persistence.Table;
-import javax.validation.constraints.Max;
+import jakarta.validation.constraints.Max;
 
 @Entity
 @Table(name = "ORDERS")

aws-modules/aws-dynamodb/pom.xml

@@ -79,7 +79,7 @@
     </build>
 
     <properties>
-        <gson.version>2.8.0</gson.version>
+        <gson.version>2.10.1</gson.version>
         <dynamodblocal.version>1.21.1</dynamodblocal.version>
         <maven-plugins-version>3.1.1</maven-plugins-version>
     </properties>

aws-modules/aws-miscellaneous/pom.xml

@@ -73,7 +73,7 @@
     </build>
 
     <properties>
-        <gson.version>2.8.0</gson.version>
+        <gson.version>2.10.1</gson.version>
         <dynamodblocal.version>1.21.1</dynamodblocal.version>
         <commons-codec-version>1.10.L001</commons-codec-version>
         <jets3t-version>0.9.4.0006L</jets3t-version>

core-java-modules/core-java-8-datetime-2/README.md

@@ -6,4 +6,5 @@
 - [How Many Days Are There in a Particular Month of a Given Year?](https://www.baeldung.com/days-particular-month-given-year)
 - [Difference Between Instant and LocalDateTime](https://www.baeldung.com/java-instant-vs-localdatetime)
 - [Add Minutes to a Time String in Java](https://www.baeldung.com/java-string-time-add-mins)
+- [Round the Date in Java](https://www.baeldung.com/java-round-the-date)
 - [[<-- Prev]](/core-java-modules/core-java-datetime-java8-1)

core-java-modules/core-java-8-datetime-2/pom.xml

@@ -55,7 +55,7 @@
     <properties>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
-        <joda-time.version>2.10</joda-time.version>
+        <joda-time.version>2.12.5</joda-time.version>
     </properties>
 
 </project>

core-java-modules/core-java-8-datetime-2/src/main/java/com/baeldung/parsingDates/SimpleParseDate.java

@@ -7,7 +7,7 @@ import java.util.List;
 
 public class SimpleParseDate {
 
-    public Date parseDate(String dateString, List<String> formatStrings) {
+    public static Date parseDate(String dateString, List<String> formatStrings) {
         for (String formatString : formatStrings) {
             try {
                 return new SimpleDateFormat(formatString).parse(dateString);

core-java-modules/core-java-8-datetime-2/src/test/java/com/baeldung/parsingDates/SimpleParseDateUnitTest.java

@@ -1,43 +1,41 @@
 package com.baeldung.parsingDates;
 
-import com.baeldung.parsingDates.SimpleDateTimeFormat;
+import static org.junit.jupiter.api.Assertions.assertEquals;
-import com.baeldung.parsingDates.SimpleDateTimeFormater;
+import static org.junit.jupiter.api.Assertions.assertNull;
-import com.baeldung.parsingDates.SimpleDateUtils;
+import static org.junit.jupiter.api.Assertions.assertThrows;
-import com.baeldung.parsingDates.SimpleParseDate;
+
 import java.time.format.DateTimeParseException;
 import java.util.Arrays;
-import org.junit.*;
+
-import static org.junit.Assert.*;
 import org.joda.time.LocalDate;
+import org.junit.jupiter.api.Test;
 
-public class SimpleParseDateUnitTest {
+class SimpleParseDateUnitTest {
 
     @Test
-    public void whenInvalidInput_thenGettingUnexpectedResult() {
+    void whenInvalidInput_thenGettingUnexpectedResult() {
-        SimpleParseDate simpleParseDate = new SimpleParseDate();
         String date = "2022-40-40";
-        assertEquals("Sat May 10 00:00:00 UTC 2025", simpleParseDate.parseDate(date, Arrays.asList("MM/dd/yyyy", "dd.MM.yyyy", "yyyy-MM-dd")).toString());
+        assertEquals("Sat May 10 00:00:00 UTC 2025", SimpleParseDate.parseDate(date, Arrays.asList("MM/dd/yyyy", "dd.MM.yyyy", "yyyy-MM-dd"))
+            .toString());
     }
 
     @Test
-    public void whenInvalidDate_thenAssertThrows() {
+    void whenInvalidDate_thenAssertThrows() {
-        SimpleDateTimeFormater simpleDateTimeFormater = new SimpleDateTimeFormater();
+        assertEquals(java.time.LocalDate.parse("2022-12-04"), SimpleDateTimeFormater.parseDate("2022-12-04"));
-        assertEquals(java.time.LocalDate.parse("2022-12-04"), simpleDateTimeFormater.parseDate("2022-12-04"));
+        assertThrows(DateTimeParseException.class, () -> SimpleDateTimeFormater.parseDate("2022-13-04"));
-        assertThrows(DateTimeParseException.class, () -> simpleDateTimeFormater.parseDate("2022-13-04"));
     }
 
     @Test
-    public void whenDateIsCorrect_thenParseCorrect() {
+    void whenDateIsCorrect_thenParseCorrect() {
-        SimpleDateUtils simpleDateUtils = new SimpleDateUtils();
+        assertNull(SimpleDateUtils.parseDate("53/10/2014"));
-        assertNull(simpleDateUtils.parseDate("53/10/2014"));
+        assertEquals("Wed Sep 10 00:00:00 UTC 2014", SimpleDateUtils.parseDate("10/09/2014")
-        assertEquals("Wed Sep 10 00:00:00 UTC 2014", simpleDateUtils.parseDate("10/09/2014").toString());
+            .toString());
     }
 
     @Test
-    public void whenDateIsCorrect_thenResultCorrect() {
+    void whenDateIsCorrect_thenResultCorrect() {
-        SimpleDateTimeFormat simpleDateTimeFormat = new SimpleDateTimeFormat();
+        assertNull(SimpleDateTimeFormat.parseDate("53/10/2014"));
-        assertNull(simpleDateTimeFormat.parseDate("53/10/2014"));
+        assertEquals(LocalDate.parse("2014-10-10"), SimpleDateTimeFormat.parseDate("2014-10-10"));
-        assertEquals(LocalDate.parse("2014-10-10"), simpleDateTimeFormat.parseDate("2014-10-10"));
     }
 
 }

core-java-modules/core-java-8-datetime/pom.xml

@@ -56,7 +56,7 @@
     <properties>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
-        <joda-time.version>2.10</joda-time.version>
+        <joda-time.version>2.12.5</joda-time.version>
     </properties>
 
 </project>

core-java-modules/core-java-8/src/main/java/com/baeldung/streamreduce/application/Application.java

@@ -1,62 +0,0 @@
-package com.baeldung.streamreduce.application;
-
-import com.baeldung.streamreduce.entities.User;
-import com.baeldung.streamreduce.utilities.NumberUtils;
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.List;
-
-public class Application {
-
-    public static void main(String[] args) {
-        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5, 6);
-        int result1 = numbers.stream().reduce(0, (a, b) -> a + b);
-        System.out.println(result1);
-        
-        int result2 = numbers.stream().reduce(0, Integer::sum);
-        System.out.println(result2);
-
-        List<String> letters = Arrays.asList("a", "b", "c", "d", "e");
-        String result3 = letters.stream().reduce("", (a, b) -> a + b);
-        System.out.println(result3);
-        
-        String result4 = letters.stream().reduce("", String::concat);
-        System.out.println(result4);
-
-        String result5 = letters.stream().reduce("", (a, b) -> a.toUpperCase() + b.toUpperCase());
-        System.out.println(result5);
-        
-        List<User> users = Arrays.asList(new User("John", 30), new User("Julie", 35));
-        int result6 = users.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum);
-        System.out.println(result6);
-        
-        String result7 = letters.parallelStream().reduce("", String::concat);
-        System.out.println(result7);
-        
-        int result8 = users.parallelStream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum);
-        System.out.println(result8);
-        
-        List<User> userList = new ArrayList<>();
-        for (int i = 0; i <= 1000000; i++) {
-            userList.add(new User("John" + i, i));
-        }
-        
-        long t1 = System.currentTimeMillis();
-        int result9 = userList.stream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum);
-        long t2 = System.currentTimeMillis();
-        System.out.println(result9);
-        System.out.println("Sequential stream time: " + (t2 - t1) + "ms");
-        
-        long t3 = System.currentTimeMillis();
-        int result10 = userList.parallelStream().reduce(0, (partialAgeResult, user) -> partialAgeResult + user.getAge(), Integer::sum);
-        long t4 = System.currentTimeMillis();
-        System.out.println(result10);
-        System.out.println("Parallel stream time: " + (t4 - t3) + "ms");
-        
-        int result11 = NumberUtils.divideListElements(numbers, 1);
-        System.out.println(result11);
-        
-        int result12 = NumberUtils.divideListElementsWithExtractedTryCatchBlock(numbers, 0);
-        System.out.println(result12);
-    }    
-}

core-java-modules/core-java-8/src/main/java/com/baeldung/streamreduce/entities/Rating.java

@@ -1,39 +0,0 @@
-package com.baeldung.streamreduce.entities;
-
-import java.util.ArrayList;
-import java.util.List;
-
-public class Rating {
-
-    double points;
-    List<Review> reviews = new ArrayList<>();
-
-    public Rating() {}
-
-    public void add(Review review) {
-        reviews.add(review);
-        computeRating();
-    }
-
-    private double computeRating() {
-        double totalPoints = reviews.stream().map(Review::getPoints).reduce(0, Integer::sum);
-        this.points = totalPoints / reviews.size();
-        return this.points;
-    }
-
-    public static Rating average(Rating r1, Rating r2) {
-        Rating combined = new Rating();
-        combined.reviews = new ArrayList<>(r1.reviews);
-        combined.reviews.addAll(r2.reviews);
-        combined.computeRating();
-        return combined;
-    }
-
-    public double getPoints() {
-        return points;
-    }
-
-    public List<Review> getReviews() {
-        return reviews;
-    }
-}

core-java-modules/core-java-8/src/main/java/com/baeldung/streamreduce/entities/Review.java

@@ -1,28 +0,0 @@
-package com.baeldung.streamreduce.entities;
-
-public class Review {
-
-    int points;
-    String review;
-
-    public Review(int points, String review) {
-        this.points = points;
-        this.review = review;
-    }
-
-    public int getPoints() {
-        return points;
-    }
-
-    public void setPoints(int points) {
-        this.points = points;
-    }
-
-    public String getReview() {
-        return review;
-    }
-
-    public void setReview(String review) {
-        this.review = review;
-    }
-}

core-java-modules/core-java-8/src/main/java/com/baeldung/streamreduce/entities/User.java

@@ -1,30 +0,0 @@
-package com.baeldung.streamreduce.entities;
-
-public class User {
-
-    private final String name;
-    private final int age;
-    private final Rating rating = new Rating();
-
-    public User(String name, int age) {
-        this.name = name;
-        this.age = age;
-    }
-
-    public String getName() {
-        return name;
-    }
-
-    public int getAge() {
-        return age;
-    }
-
-    public Rating getRating() {
-        return rating;
-    }
-
-    @Override
-    public String toString() {
-        return "User{" + "name=" + name + ", age=" + age + '}';
-    }
-}

core-java-modules/core-java-8/src/main/java/com/baeldung/streamreduce/utilities/NumberUtils.java

@@ -1,52 +0,0 @@
-package com.baeldung.streamreduce.utilities;
-
-import java.util.List;
-import java.util.function.BiFunction;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-
-public abstract class NumberUtils {
-
-    private static final Logger LOGGER = Logger.getLogger(NumberUtils.class.getName());
-
-    public static int divideListElements(List<Integer> values, Integer divider) {
-        return values.stream()
-                .reduce(0, (a, b) -> {
-                    try {
-                        return a / divider + b / divider;
-                    } catch (ArithmeticException e) {
-                        LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero");
-                    }
-                    return 0;
-                });
-    }
-    
-    public static int divideListElementsWithExtractedTryCatchBlock(List<Integer> values, int divider) {
-        return values.stream().reduce(0, (a, b) -> divide(a, divider) + divide(b, divider));
-    }
-    
-    public static int divideListElementsWithApplyFunctionMethod(List<Integer> values, int divider) {
-        BiFunction<Integer, Integer, Integer> division = (a, b) -> a / b;
-        return values.stream().reduce(0, (a, b) -> applyFunction(division, a, divider) + applyFunction(division, b, divider));
-    }
-    
-    private static int divide(int value, int factor) {
-        int result = 0;
-        try {
-            result = value / factor;
-        } catch (ArithmeticException e) {
-            LOGGER.log(Level.INFO, "Arithmetic Exception: Division by Zero");
-        }
-        return result;
-    }
-    
-    private static int applyFunction(BiFunction<Integer, Integer, Integer> function, int a, int b) {
-        try {
-            return function.apply(a, b);
-        }
-        catch(Exception e) {
-            LOGGER.log(Level.INFO, "Exception occurred!");
-        }
-        return 0;
-    }
-}

core-java-modules/core-java-collections-5/README.md

@@ -8,4 +8,5 @@
 - [Difference Between Arrays.sort() and Collections.sort()](https://www.baeldung.com/java-arrays-collections-sort-methods)
 - [Skipping the First Iteration in Java](https://www.baeldung.com/java-skip-first-iteration)
 - [Remove Elements From a Queue Using Loop](https://www.baeldung.com/java-remove-elements-queue)
+- [Intro to Vector Class in Java](https://www.baeldung.com/java-vector-guide)
 - More articles: [[<-- prev]](/core-java-modules/core-java-collections-4)

core-java-modules/core-java-collections-5/toarraymethod/ConvertingHashSetToArrayUnitTest.java

@@ -0,0 +1,51 @@
+package com.baeldung.toarraymethod;
+
+import org.junit.Test;
+
+import java.util.HashSet;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+public class ConvertingHashSetToArrayUnitTest {
+
+    @Test
+    public void givenStringHashSet_whenConvertedToArray_thenArrayContainsStringElements() {
+        HashSet<String> stringSet = new HashSet<>();
+        stringSet.add("Apple");
+        stringSet.add("Banana");
+        stringSet.add("Cherry");
+
+        // Convert the HashSet of Strings to an array of Strings
+        String[] stringArray = stringSet.toArray(new String[0]);
+
+        // Test that the array is of the correct length
+        assertEquals(3, stringArray.length);
+
+        for (String str : stringArray) {
+            assertTrue(stringSet.contains(str));
+        }
+    }
+
+    @Test
+    public void givenIntegerHashSet_whenConvertedToArray_thenArrayContainsIntegerElements() {
+        HashSet<Integer> integerSet = new HashSet<>();
+        integerSet.add(5);
+        integerSet.add(10);
+        integerSet.add(15);
+
+        // Convert the HashSet of Integers to an array of Integers
+        Integer[] integerArray = integerSet.toArray(new Integer[0]);
+
+        // Test that the array is of the correct length
+        assertEquals(3, integerArray.length);
+
+        for (Integer num : integerArray) {
+            assertTrue(integerSet.contains(num));
+        }
+
+        assertTrue(integerSet.contains(5));
+        assertTrue(integerSet.contains(10));
+        assertTrue(integerSet.contains(15));
+    }
+}

core-java-modules/core-java-collections-conversions-2/pom.xml

@@ -44,6 +44,6 @@
     <properties>
         <vavr.version>0.10.3</vavr.version>
         <java.version>11</java.version>
-        <modelmapper.version>3.1.1</modelmapper.version>
+        <modelmapper.version>3.2.0</modelmapper.version>
     </properties>
 </project>

core-java-modules/core-java-collections-conversions-2/src/test/java/com/baeldung/modelmapper/UsersListMappingUnitTest.java

@@ -1,8 +1,9 @@
 package com.baeldung.modelmapper;
 
 import org.hamcrest.Matchers;
-import org.junit.Before;
+
-import org.junit.Test;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
 import org.modelmapper.ModelMapper;
 import org.modelmapper.TypeMap;
 import org.modelmapper.TypeToken;
@@ -10,11 +11,10 @@ import org.modelmapper.TypeToken;
 import java.util.ArrayList;
 import java.util.List;
 
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.hasItems;
 import static org.hamcrest.Matchers.hasProperty;
-import static org.junit.Assert.assertThat;
-
 
 /**
  * This class has test methods of mapping Integer to Character list,
@@ -22,12 +22,12 @@ import static org.junit.Assert.assertThat;
  *
  * @author Sasa Milenkovic
  */
-public class UsersListMappingUnitTest {
+class UsersListMappingUnitTest {
 
     private ModelMapper modelMapper;
     private List<User> users;
 
-    @Before
+    @BeforeEach
     public void init() {
 
         modelMapper = new ModelMapper();
@@ -35,18 +35,16 @@ public class UsersListMappingUnitTest {
         TypeMap<UserList, UserListDTO> typeMap = modelMapper.createTypeMap(UserList.class, UserListDTO.class);
 
         typeMap.addMappings(mapper -> mapper.using(new UsersListConverter())
-                .map(UserList::getUsers, UserListDTO::setUsernames));
+            .map(UserList::getUsers, UserListDTO::setUsernames));
 
-        users = new ArrayList();
+        users = new ArrayList<>();
         users.add(new User("b100", "user1", "user1@baeldung.com", "111-222", "USER"));
         users.add(new User("b101", "user2", "user2@baeldung.com", "111-333", "USER"));
         users.add(new User("b102", "user3", "user3@baeldung.com", "111-444", "ADMIN"));
-
     }
 
     @Test
-    public void whenInteger_thenMapToCharacter() {
+    void whenInteger_thenMapToCharacter() {
-
         List<Integer> integers = new ArrayList<Integer>();
 
         integers.add(1);
@@ -57,36 +55,27 @@ public class UsersListMappingUnitTest {
         }.getType());
 
         assertThat(characters, hasItems('1', '2', '3'));
-
     }
 
     @Test
-    public void givenUsersList_whenUseGenericType_thenMapToUserDTO() {
+    void givenUsersList_whenUseGenericType_thenMapToUserDTO() {
-
         // Mapping lists using custom (generic) type mapping
-
         List<UserDTO> userDtoList = MapperUtil.mapList(users, UserDTO.class);
 
-        assertThat(userDtoList, Matchers.<UserDTO>hasItem(
+        assertThat(userDtoList, Matchers.<UserDTO> hasItem(Matchers.both(hasProperty("userId", equalTo("b100")))
-                Matchers.both(hasProperty("userId", equalTo("b100")))
+            .and(hasProperty("email", equalTo("user1@baeldung.com")))
-                        .and(hasProperty("email", equalTo("user1@baeldung.com")))
+            .and(hasProperty("username", equalTo("user1")))));
-                        .and(hasProperty("username", equalTo("user1")))));
-
-
     }
 
     @Test
-    public void givenUsersList_whenUseConverter_thenMapToUsernames() {
+    void givenUsersList_whenUseConverter_thenMapToUsernames() {
-
         // Mapping lists using property mapping and converter
-
         UserList userList = new UserList();
         userList.setUsers(users);
         UserListDTO dtos = new UserListDTO();
         modelMapper.map(userList, dtos);
 
         assertThat(dtos.getUsernames(), hasItems("user1", "user2", "user3"));
-
     }
 
 }

core-java-modules/core-java-collections-maps-7/README.md

@@ -1,3 +1,7 @@
-## Relevant Articles
+## Relevant Articles:
 - [Difference Between putIfAbsent() and computeIfAbsent() in Java’s Map](https://www.baeldung.com/java-map-putifabsent-computeifabsent)
+- [How to Write and Read a File with a Java HashMap](https://www.baeldung.com/how-to-write-and-read-a-file-with-a-java-hashmap/)
 - [How to Write Hashmap to CSV File](https://www.baeldung.com/java-write-hashmap-csv)
+- [How to Get First or Last Entry From a LinkedHashMap in Java](https://www.baeldung.com/java-linkedhashmap-first-last-key-value-pair)
+- [How to Write and Read a File with a Java HashMap](https://www.baeldung.com/java-hashmap-write-read-file)
+- More articles: [[<-- prev]](/core-java-modules/core-java-collections-maps-6)

core-java-modules/core-java-collections-maps-7/pom.xml

@@ -1,11 +1,15 @@
 <?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"
+         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">
+         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>core-java-collections-maps-7</artifactId>
     <name>core-java-collections-maps-7</name>
     <packaging>jar</packaging>
+    <properties>
+        <gson.version>2.10.1</gson.version>
+        <csv.version>1.5</csv.version>
+    </properties>
 
     <parent>
         <artifactId>core-java-modules</artifactId>
@@ -13,72 +17,24 @@
         <version>0.0.1-SNAPSHOT</version>
     </parent>
 
-    <properties>
-        <spring.version>5.2.5.RELEASE</spring.version>
-    </properties>
     <dependencies>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
-            <version>2.12.4</version>
+            <version>${jackson.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.openjdk.jmh</groupId>
-            <artifactId>jmh-core</artifactId>
-            <version>1.36</version>
         </dependency>
         <dependency>
             <groupId>com.google.code.gson</groupId>
             <artifactId>gson</artifactId>
-            <version>2.8.9</version>
+            <version>${gson.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.json</groupId>
-            <artifactId>json</artifactId>
-            <version>20230227</version>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.13.1</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter</artifactId>
-            <version>5.8.1</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter</artifactId>
-            <version>5.8.1</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.13.1</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter</artifactId>
-            <version>5.8.1</version>
-            <scope>test</scope>
-        </dependency>
-        <dependency>
-            <groupId>junit</groupId>
-            <artifactId>junit</artifactId>
-            <version>4.13.1</version>
-            <scope>test</scope>
         </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-csv</artifactId>
-            <version>1.5</version>
+            <version>${csv.version}</version>
         </dependency>
     </dependencies>
+
     <build>
         <plugins>
             <plugin>
@@ -92,5 +48,4 @@
             </plugin>
         </plugins>
     </build>
-
 </project>

core-java-modules/core-java-collections-maps-7/src/main/java/com/baeldung/map/readandwritefile/Student.java

@@ -0,0 +1,51 @@
+package com.baeldung.map.readandwritefile;
+
+import java.io.Serializable;
+import java.util.Objects;
+
+public class Student implements Serializable {
+    private static final long serialVersionUID = 1L;
+    private String firstName;
+    private String lastName;
+
+    /** Default constructor for JSON serialization */
+    public Student() {
+
+    }
+
+    public Student(String firstName, String lastName) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public void setLastName(String lastName) {
+        this.lastName = lastName;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o)
+            return true;
+        if (o == null || getClass() != o.getClass())
+            return false;
+        Student student = (Student) o;
+        return Objects.equals(firstName, student.firstName) && Objects.equals(lastName, student.lastName);
+    }
+
+    @Override
+    public int hashCode() {
+        return super.hashCode();
+    }
+}

core-java-modules/core-java-collections-maps-7/src/test/java/com/baeldung/map/readandwritefile/ReadAndWriteFileWithHashMapUnitTest.java

@@ -0,0 +1,135 @@
+package com.baeldung.map.readandwritefile;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.OutputStream;
+import java.lang.reflect.Type;
+import java.nio.file.Files;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+import java.util.stream.Collectors;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+
+import org.junit.After;
+import org.junit.Test;
+import org.junit.Before;
+
+public class ReadAndWriteFileWithHashMapUnitTest {
+
+    private static final Map<Integer, Student> STUDENT_DATA = new HashMap<>();
+
+    static {
+        STUDENT_DATA.put(1234, new Student("Henry", "Winter"));
+        STUDENT_DATA.put(5678, new Student("Richard", "Papen"));
+    }
+
+    private File file;
+
+    @Before
+    public void createFile() throws IOException {
+        file = File.createTempFile("student", ".data");
+    }
+
+    @After
+    public void deleteFile() {
+        file.delete();
+    }
+
+    @Test
+    public void givenHashMap_whenWrittenAsPropertiesFile_thenReloadedMapIsIdentical() throws IOException {
+        // Given a map containing student data
+        Map<String, String> studentData = new HashMap<>();
+        studentData.put("student.firstName", "Henry");
+        studentData.put("student.lastName", "Winter");
+
+        // When converting to a Properties object and writing to a file
+        Properties props = new Properties();
+        props.putAll(studentData);
+        try (OutputStream output = Files.newOutputStream(file.toPath())) {
+            props.store(output, null);
+        }
+
+        // Then the map resulting from loading the Properties file is identical
+        Properties propsFromFile = new Properties();
+        try (InputStream input = Files.newInputStream(file.toPath())) {
+            propsFromFile.load(input);
+        }
+
+        Map<String, String> studentDataFromProps = propsFromFile.stringPropertyNames()
+            .stream()
+            .collect(Collectors.toMap(key -> key, props::getProperty));
+        assertThat(studentDataFromProps).isEqualTo(studentData);
+    }
+
+    @Test
+    public void givenHashMap_whenSerializedToFile_thenDeserializedMapIsIdentical() throws IOException, ClassNotFoundException {
+        // Given a map containing student data (STUDENT_DATA)
+
+        // When serializing the map to a file
+        try (FileOutputStream fileOutput = new FileOutputStream(file); ObjectOutputStream objectStream = new ObjectOutputStream(fileOutput)) {
+            objectStream.writeObject(STUDENT_DATA);
+        }
+
+        // Then read the file back into a map and check the contents
+        Map<Integer, Student> studentsFromFile;
+        try (FileInputStream fileReader = new FileInputStream(file); ObjectInputStream objectStream = new ObjectInputStream(fileReader)) {
+            studentsFromFile = (HashMap<Integer, Student>) objectStream.readObject();
+        }
+        assertThat(studentsFromFile).isEqualTo(STUDENT_DATA);
+    }
+
+    @Test
+    public void givenHashMap_whenSerializedToFileWithJackson_thenDeserializedMapIsIdentical() throws IOException {
+        // Given a map containing student data (STUDENT_DATA)
+
+        // When converting to JSON with Jackson and writing to a file
+        ObjectMapper mapper = new ObjectMapper();
+        try (FileOutputStream fileOutput = new FileOutputStream(file)) {
+            mapper.writeValue(fileOutput, STUDENT_DATA);
+        }
+
+        // Then deserialize the file back into a map and check that it's identical
+        Map<Integer, Student> mapFromFile;
+        try (FileInputStream fileInput = new FileInputStream(file)) {
+            // Create a TypeReference so we can deserialize the parameterized type
+            TypeReference<HashMap<Integer, Student>> mapType = new TypeReference<HashMap<Integer, Student>>() {
+            };
+            mapFromFile = mapper.readValue(fileInput, mapType);
+        }
+        assertThat(mapFromFile).isEqualTo(STUDENT_DATA);
+    }
+
+    @Test
+    public void givenHashMap_whenSerializedToFileWithGson_thenDeserializedMapIsIdentical() throws IOException {
+        // Given a map containing student data (STUDENT_DATA)
+
+        // When converting to JSON using Gson and writing to a file
+        Gson gson = new Gson();
+        try (FileWriter writer = new FileWriter(file)) {
+            gson.toJson(STUDENT_DATA, writer);
+        }
+
+        // Then deserialize the file back into a map and check that it's identical
+        Map<Integer, Student> studentsFromFile;
+        try (FileReader reader = new FileReader(file)) {
+            Type mapType = new TypeToken<HashMap<Integer, Student>>() {
+            }.getType();
+            studentsFromFile = gson.fromJson(reader, mapType);
+        }
+        assertThat(studentsFromFile).isEqualTo(STUDENT_DATA);
+    }
+}

core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/atomicinteger/Employee.java

@@ -0,0 +1,30 @@
+package com.baeldung.concurrent.synchronizestatic.atomicinteger;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * Synchronizing static variable with AtomicInteger.
+ */
+public class Employee {
+
+    private static final AtomicInteger count = new AtomicInteger(0);
+
+    int id;
+    String name;
+    String title;
+
+    public Employee(int id, String name, String title) {
+        incrementCount();
+        this.id = id;
+        this.name = name;
+        this.title = title;
+    }
+
+    private static void incrementCount() {
+        count.incrementAndGet();
+    }
+
+    public static int getCount() {
+        return count.get();
+    }
+}

core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/none/Employee.java

@@ -0,0 +1,27 @@
+package com.baeldung.concurrent.synchronizestatic.none;
+
+/**
+ * No synchronization.
+ */
+public class Employee {
+
+    static int count;
+    int id;
+    String name;
+    String title;
+
+    public Employee(int id, String name, String title) {
+        incrementCount();
+        this.id = id;
+        this.name = name;
+        this.title = title;
+    }
+
+    private static void incrementCount() {
+        System.out.println("Count = " + ++count);
+    }
+
+    public static Integer getCount() {
+        return count;
+    }
+}

core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/reentrantlock/Employee.java

@@ -0,0 +1,43 @@
+package com.baeldung.concurrent.synchronizestatic.reentrantlock;
+
+import java.util.concurrent.locks.ReentrantLock;
+
+/**
+ * Synchronizing static variable with a Reenatrant Lock.
+ */
+public class Employee {
+
+    private static final ReentrantLock lock = new ReentrantLock();
+
+    static int count;
+    int id;
+    String name;
+    String title;
+
+    public Employee(int id, String name, String title) {
+        incrementCount();
+        this.id = id;
+        this.name = name;
+        this.title = title;
+    }
+
+    private static void incrementCount() {
+        lock.lock();
+        try {
+            System.out.println("Count = " + ++count);
+        }
+        finally {
+            lock.unlock();
+        }
+    }
+
+    public static int getCount() {
+        lock.lock();
+        try {
+            return count;
+        }
+        finally {
+            lock.unlock();
+        }
+    }
+}

core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedblock/Employee.java

@@ -0,0 +1,33 @@
+package com.baeldung.concurrent.synchronizestatic.synchronizedblock;
+
+/**
+ * Synchronizing static variable with a synchronized block.
+ */
+public class Employee {
+
+    private static final Object lock = new Object();
+
+    static int count;
+    int id;
+    String name;
+    String title;
+
+    public Employee(int id, String name, String title) {
+        incrementCount();
+        this.id = id;
+        this.name = name;
+        this.title = title;
+    }
+
+    private static void incrementCount() {
+        synchronized(lock) {
+            System.out.println("Count = " + ++count);
+        }
+    }
+
+    public static int getCount() {
+        synchronized(lock) {
+            return count;
+        }
+    }
+}

core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedclass/Employee.java

@@ -0,0 +1,31 @@
+package com.baeldung.concurrent.synchronizestatic.synchronizedclass;
+
+/**
+ * Synchronizing static variable with a synchronized block.
+ */
+public class Employee
+{
+    static int count;
+    int id;
+    String name;
+    String title;
+
+    public Employee(int id, String name, String title) {
+        incrementCount();
+        this.id = id;
+        this.name = name;
+        this.title = title;
+    }
+
+    private static void incrementCount() {
+        synchronized(Employee.class) {
+            System.out.println("Count = " + ++count);
+        }
+    }
+
+    public static int getCount() {
+        synchronized(Employee.class) {
+            return count;
+        }
+    }
+}

core-java-modules/core-java-concurrency-basic-3/src/main/java/com/baeldung/concurrent/synchronizestatic/synchronizedmethod/Employee.java

@@ -0,0 +1,27 @@
+package com.baeldung.concurrent.synchronizestatic.synchronizedmethod;
+
+/**
+ * Synchronizing static variable with a synchronized method.
+ */
+public class Employee {
+    static int count;
+    int id;
+    String name;
+    String title;
+
+    public Employee(int id, String name, String title)
+    {
+        incrementCount();
+        this.id = id;
+        this.name = name;
+        this.title = title;
+    }
+
+    private static synchronized void incrementCount() {
+        System.out.println("Count = " + ++count);
+    }
+
+    public static synchronized int getCount() {
+        return count;
+    }
+}

core-java-modules/core-java-concurrency-basic-3/src/test/java/com/baeldung/concurrent/synchronizestatic/SychronizeStaticDataUnitTest.java

@@ -0,0 +1,90 @@
+package com.baeldung.concurrent.synchronizestatic;
+
+import org.junit.Test;
+
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+
+/**
+ * The tests in this class show the output of creating multiple
+ * types of Employee classes in the <code>synchronizedstatic</code>
+ * package. When not synchronized the out will not be sequential;
+ * when it is synchronized the output will be in sequential.
+ */
+public class SychronizeStaticDataUnitTest {
+    private final Executor pool = Executors.newFixedThreadPool(4);
+
+    private final int numberToTest = 100;
+
+    @Test
+    public void whenNotSynchronized_thenDataOutOfOrder() {
+
+        System.out.println("No synchronization");
+
+        for(int i = 0; i < numberToTest; i++) {
+            int finalI = i;
+            pool.execute(() -> {
+                new com.baeldung.concurrent.synchronizestatic.none.Employee(finalI, "John", "Smith");
+            });
+        }
+    }
+
+    @Test
+    public void whenSynchronizedMethod_thenDataInOrder() {
+
+        System.out.println("Synchronization with synchronized method");
+
+        for(int i = 0; i < numberToTest; i++) {
+            int finalI = i;
+            pool.execute(() -> {
+                new com.baeldung.concurrent.synchronizestatic.synchronizedmethod.Employee(finalI, "John", "Smith");
+            });
+        }
+    }
+
+    @Test
+    public void whenSynchronizedClass_thenDataInOrder() {
+
+        System.out.println("Synchronization with synchronized block on class");
+
+        for(int i = 0; i < numberToTest; i++) {
+            int finalI = i;
+            pool.execute(() -> {
+                new com.baeldung.concurrent.synchronizestatic.synchronizedclass.Employee(finalI, "John", "Smith");
+            });
+        }
+    }
+
+    @Test
+    public void whenSynchronizedBlock_thenDataInOrder() {
+
+        System.out.println("Synchronization with synchronized block on a private object");
+
+        for(int i = 0; i < numberToTest; i++) {
+            int finalI = i;
+            pool.execute(() -> {
+               new com.baeldung.concurrent.synchronizestatic.synchronizedblock.Employee(finalI, "John", "Smith");
+            });
+        }
+    }
+
+    @Test
+    public void whenAtomicInteger_thenDataInOrder() {
+        // Not straight forward to test this because we cannot log/print
+        // and increment values in a synchronized fashion like other
+        // tests
+    }
+
+    @Test
+    public void whenReentrantLock_thenDataInOrder() {
+
+        System.out.println("Synchronization with ReentrantLock");
+
+        for(int i = 0; i < numberToTest; i++) {
+            int finalI = i;
+            pool.execute(() -> {
+                new com.baeldung.concurrent.synchronizestatic.reentrantlock.Employee(finalI, "John", "Smith");
+            });
+        }
+    }
+}

core-java-modules/core-java-conditionals/pom.xml

@@ -5,7 +5,7 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>core-java-conditionals</artifactId>
     <version>0.1.0-SNAPSHOT</version>
-    <name>core-java-compiler</name>
+    <name>core-java-conditionals</name>
     <packaging>jar</packaging>
 
     <parent>

core-java-modules/core-java-date-operations-1/pom.xml

@@ -54,7 +54,7 @@
     </build>
 
     <properties>
-        <joda-time.version>2.10</joda-time.version>
+        <joda-time.version>2.12.5</joda-time.version>
         <hirondelle-date4j.version>RELEASE</hirondelle-date4j.version>
         <maven.compiler.source>1.9</maven.compiler.source>
         <maven.compiler.target>1.9</maven.compiler.target>

core-java-modules/core-java-date-operations-2/pom.xml

@@ -47,7 +47,7 @@
     </dependencies>
 
     <properties>
-        <joda-time.version>2.10</joda-time.version>
+        <joda-time.version>2.12.5</joda-time.version>
         <hirondelle-date4j.version>1.5.1</hirondelle-date4j.version>
         <prettytime.version>3.2.7.Final</prettytime.version>
         <time4j-base.version>5.9</time4j-base.version>

core-java-modules/core-java-date-operations-3/README.md

@@ -11,4 +11,6 @@ This module contains articles about date operations in Java.
 - [Getting Yesterday’s Date in Java](https://www.baeldung.com/java-find-yesterdays-date)
 - [How to Get the Start and End Dates of a Year Using Java](https://www.baeldung.com/java-date-year-start-end)
 - [Convert Between Java LocalDate and Epoch](https://www.baeldung.com/java-localdate-epoch)
+- [Get First Date of Current Month in Java](https://www.baeldung.com/java-current-month-start-date)
+- [Time Conversions Using TimeUnit](https://www.baeldung.com/java-timeunit-conversion)
 - [[<-- Prev]](/core-java-modules/core-java-date-operations-2)

core-java-modules/core-java-date-operations-3/src/test/java/com/baeldung/timeunitconversions/TimeUnitConversionsUnitTest.java

@@ -0,0 +1,105 @@
+package com.baeldung.timeunitconversions;
+
+import org.junit.jupiter.api.Test;
+
+import java.util.concurrent.TimeUnit;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class TimeUnitConversionsUnitTest {
+
+
+    @Test
+    void givenSeconds_whenConvertToMinutes_thenCorrect() {
+        int input = 60;
+
+        long minutes = TimeUnit.MINUTES.convert(input, TimeUnit.SECONDS);
+
+        assertThat(minutes).isEqualTo(1);
+    }
+
+    @Test
+    void givenMinutes_whenConvertToSeconds_thenCorrect() {
+        int input = 1;
+
+        long seconds = TimeUnit.SECONDS.convert(input, TimeUnit.MINUTES);
+
+        assertThat(seconds).isEqualTo(60);
+    }
+
+    @Test
+    void givenSeconds_whenToMinutes_thenCorrect() {
+        int input = 60;
+
+        long minutes = TimeUnit.SECONDS.toMinutes(input);
+
+        assertThat(minutes).isEqualTo(1);
+    }
+
+    @Test
+    void givenMinutes_whenToSeconds_thenCorrect() {
+        int input = 1;
+
+        long seconds = TimeUnit.MINUTES.toSeconds(input);
+
+        assertThat(seconds).isEqualTo(60);
+    }
+
+    @Test
+    void givenNegativeInput_whenToMinutes_thenCorrect() {
+        int input = -60;
+
+        long minutes = TimeUnit.SECONDS.toMinutes(input);
+        assertThat(minutes).isEqualTo(-1);
+    }
+
+    @Test
+    void givenNonTotalInput_whenToMinutes_thenCorrectTotalResultWithDecimalTruncate() {
+        long positiveUnder = TimeUnit.SECONDS.toMinutes(59);
+        long positiveAbove = TimeUnit.SECONDS.toMinutes(61);
+
+        assertThat(positiveUnder).isEqualTo(0);
+        assertThat(positiveAbove).isEqualTo(1);
+    }
+
+    @Test
+    void givenNonTotalNegativeInput_whenToMinutes_thenCorrectTotalResultWithDecimalTruncate() {
+        long negativeUnder = TimeUnit.SECONDS.toMinutes(-59);
+        long negativeAbove = TimeUnit.SECONDS.toMinutes(-61);
+
+        assertThat(negativeUnder).isEqualTo(0);
+        assertThat(negativeAbove).isEqualTo(-1);
+    }
+
+    @Test
+    void givenOverflowInput_whenToMillis_thenTruncatedToLimit() {
+        long maxMillis = TimeUnit.DAYS.toMillis(Long.MAX_VALUE);
+        long minMillis = TimeUnit.DAYS.toMillis(Long.MIN_VALUE);
+
+        assertThat(maxMillis).isEqualTo(Long.MAX_VALUE);
+        assertThat(minMillis).isEqualTo(Long.MIN_VALUE);
+    }
+
+    @Test
+    void givenInput_whenExtractFineTimeUnits_thenCorrect() {
+        long inputSeconds = 3672;
+
+        long hours = TimeUnit.SECONDS.toHours(inputSeconds);
+
+        long secondsRemainingAfterHours = inputSeconds - TimeUnit.HOURS.toSeconds(hours);
+        long minutes = TimeUnit.SECONDS.toMinutes(secondsRemainingAfterHours);
+
+        long seconds = secondsRemainingAfterHours - TimeUnit.MINUTES.toSeconds(minutes);
+
+
+        assertThat(hours).isEqualTo(1);
+        assertThat(minutes).isEqualTo(1);
+        assertThat(seconds).isEqualTo(12);
+
+        assertThat(inputSeconds).isEqualTo(
+            (hours * 60 * 60) +
+            (minutes * 60) +
+            (seconds)
+        );
+    }
+}

core-java-modules/core-java-datetime-conversion/pom.xml

@@ -54,7 +54,7 @@
     </build>
 
     <properties>
-        <joda-time.version>2.10</joda-time.version>
+        <joda-time.version>2.12.5</joda-time.version>
         <maven.compiler.source>1.9</maven.compiler.source>
         <maven.compiler.target>1.9</maven.compiler.target>
     </properties>

core-java-modules/core-java-datetime-string/pom.xml

@@ -64,7 +64,7 @@
     </build>
 
     <properties>
-        <commons-validator.version>1.6</commons-validator.version>
+        <commons-validator.version>1.7</commons-validator.version>
         <joda-time.version>2.12.5</joda-time.version>
         <hirondelle-date4j.version>RELEASE</hirondelle-date4j.version>
         <maven.compiler.source>1.9</maven.compiler.source>

core-java-modules/core-java-datetime-string/src/test/java/com/baeldung/formatinstant/FormatInstantUnitTest.java

@@ -6,6 +6,7 @@ import java.time.Instant;
 import java.time.ZoneId;
 import java.time.format.DateTimeFormatter;
 import java.time.temporal.UnsupportedTemporalTypeException;
+import java.util.TimeZone;
 
 import org.joda.time.format.DateTimeFormat;
 import org.junit.Test;
@@ -17,7 +18,7 @@ public class FormatInstantUnitTest {
     @Test
     public void givenInstant_whenUsingDateTimeFormatter_thenFormat() {
         DateTimeFormatter formatter = DateTimeFormatter.ofPattern(PATTERN_FORMAT)
-            .withZone(ZoneId.systemDefault());
+            .withZone(TimeZone.getTimeZone("UTC").toZoneId());
 
         Instant instant = Instant.parse("2022-02-15T18:35:24.00Z");
         String formattedInstant = formatter.format(instant);

core-java-modules/core-java-documentation/README.md

@@ -4,3 +4,4 @@
 
 - [Introduction to Javadoc](http://www.baeldung.com/javadoc)
 - [Code Snippets in Java API Documentation](https://www.baeldung.com/java-doc-code-snippets)
+- [How to Document Generic Type Parameters in Javadoc](https://www.baeldung.com/java-javadoc-generic-type-parameters)

core-java-modules/core-java-io-conversions-2/src/test/java/com/baeldung/filetofrombytearray/FileToByteArrayUnitTest.java

@@ -0,0 +1,63 @@
+package com.baeldung.filetofrombytearray;
+
+import static org.junit.jupiter.api.Assertions.assertArrayEquals;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.commons.io.IOUtils;
+import org.junit.jupiter.api.Test;
+
+class FileToByteArrayUnitTest {
+
+    private static final String FILE_NAME = "src" + File.separator + "test" + File.separator + "resources" + File.separator + "sample.txt";
+    private final byte[] expectedByteArray = { 72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100 };
+
+    @Test
+    void givenFile_whenUsingFileInputStreamClass_thenConvert() throws IOException {
+        File myFile = new File(FILE_NAME);
+        byte[] byteArray = new byte[(int) myFile.length()];
+        try (FileInputStream inputStream = new FileInputStream(myFile)) {
+            inputStream.read(byteArray);
+        }
+
+        assertArrayEquals(expectedByteArray, byteArray);
+    }
+
+    @Test
+    void givenFile_whenUsingNioApiFilesClass_thenConvert() throws IOException {
+        byte[] byteArray = Files.readAllBytes(Paths.get(FILE_NAME));
+
+        assertArrayEquals(expectedByteArray, byteArray);
+    }
+
+    @Test
+    void givenFile_whenUsingApacheCommonsIOUtilsClass_thenConvert() throws IOException {
+        File myFile = new File(FILE_NAME);
+        byte[] byteArray = new byte[(int) myFile.length()];
+        try (FileInputStream inputStream = new FileInputStream(myFile)) {
+            byteArray = IOUtils.toByteArray(inputStream);
+        }
+
+        assertArrayEquals(expectedByteArray, byteArray);
+    }
+
+    @Test
+    void givenFile_whenUsingApacheCommonsFileUtilsClass_thenConvert() throws IOException {
+        byte[] byteArray = FileUtils.readFileToByteArray(new File(FILE_NAME));
+
+        assertArrayEquals(expectedByteArray, byteArray);
+    }
+
+    @Test
+    void givenFile_whenUsingGuavaFilesClass_thenConvert() throws IOException {
+        byte[] byteArray = com.google.common.io.Files.toByteArray(new File(FILE_NAME));
+
+        assertArrayEquals(expectedByteArray, byteArray);
+    }
+
+}

core-java-modules/core-java-jndi/README.md

@@ -4,3 +4,4 @@
 - [Java Naming and Directory Interface Overview](https://www.baeldung.com/jndi)
 - [LDAP Authentication Using Pure Java](https://www.baeldung.com/java-ldap-auth)
 - [Testing LDAP Connections With Java](https://www.baeldung.com/java-test-ldap-connections)
+- [JNDI – What Is java:comp/env?](https://www.baeldung.com/java-jndi-comp-env)

core-java-modules/core-java-lang-6/pom.xml

@@ -29,7 +29,6 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.5.1</version>
                 <configuration>
                     <source>17</source>
                     <target>17</target>
@@ -50,7 +49,7 @@
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <mapstruct.version>1.5.5.Final</mapstruct.version>
+        <mapstruct.version>1.6.0.Beta1</mapstruct.version>
     </properties>
 
 </project>

core-java-modules/core-java-lang-6/src/main/java/com/baeldung/stopexecution/InterruptThread.java

@@ -4,9 +4,7 @@ public class InterruptThread extends Thread {
     @Override
     public void run() {
         while (!isInterrupted()) {
-            if (isInterrupted()) {
+            break;
-                break;
-            }
             // business logic
         }
     }

core-java-modules/core-java-numbers-6/src/test/java/com/baeldung/genericnumberscomparator/GenericNumbersComparatorUnitTest.java

@@ -1,13 +1,12 @@
 package com.baeldung.genericnumberscomparator;
 
+import static org.assertj.core.api.Assertions.entry;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
 import java.lang.reflect.Method;
 import java.lang.reflect.Proxy;
 import java.util.Comparator;
-import java.util.HashMap;
 import java.util.Map;
-import java.util.Optional;
 import java.util.function.BiFunction;
 import java.util.function.BiPredicate;
 import java.util.function.Function;
@@ -25,6 +24,7 @@ class GenericNumbersComparatorUnitTest {
         assertEquals(0, compareDouble(5, 5.0));
     }
 
+    // we create a method that compares Integer, but this could also be done for other types e.g. Double, BigInteger
     public int compareTo(Integer int1, Integer int2) {
         return int1.compareTo(int2);
     }
@@ -34,11 +34,10 @@ class GenericNumbersComparatorUnitTest {
         assertEquals(-1, compareTo(5, 7));
     }
 
-    Map<Class<? extends Number>, BiFunction<Number, Number, Integer>> comparisonMap = new HashMap<>();
+    // for this example, we create a function that compares Integer, but this could also be done for other types e.g. Double, BigInteger
+    Map<Class<? extends Number>, BiFunction<Number, Number, Integer>> comparisonMap = Map.ofEntries(entry(Integer.class, (num1, num2) -> ((Integer) num1).compareTo((Integer) num2)));
 
     public int compareUsingMap(Number num1, Number num2) {
-        comparisonMap.put(Integer.class, (a, b) -> ((Integer) num1).compareTo((Integer) num2));
-
         return comparisonMap.get(num1.getClass())
             .apply(num1, num2);
     }
@@ -70,24 +69,6 @@ class GenericNumbersComparatorUnitTest {
         assertEquals(-1, compareUsingReflection(5, 7));
     }
 
-    interface NumberComparatorFactory {
-        Comparator<Number> getComparator();
-    }
-
-    class IntegerComparatorFactory implements NumberComparatorFactory {
-        @Override
-        public Comparator<Number> getComparator() {
-            return (num1, num2) -> ((Integer) num1).compareTo((Integer) num2);
-        }
-    }
-
-    @Test
-    void givenNumbers_whenUseComparatorFactory_thenWillExecuteComparison() {
-        NumberComparatorFactory factory = new IntegerComparatorFactory();
-        Comparator<Number> comparator = factory.getComparator();
-        assertEquals(-1, comparator.compare(5, 7));
-    }
-
     Function<Number, Double> toDouble = Number::doubleValue;
     BiPredicate<Number, Number> isEqual = (num1, num2) -> toDouble.apply(num1)
         .equals(toDouble.apply(num2));
@@ -97,20 +78,7 @@ class GenericNumbersComparatorUnitTest {
         assertEquals(true, isEqual.test(5, 5.0));
     }
 
-    private Number someNumber = 5;
+    private boolean someCondition;
-    private Number anotherNumber = 5.0;
-
-    Optional<Number> optNum1 = Optional.ofNullable(someNumber);
-    Optional<Number> optNum2 = Optional.ofNullable(anotherNumber);
-    int comparisonResult = optNum1.flatMap(n1 -> optNum2.map(n2 -> Double.compare(n1.doubleValue(), n2.doubleValue())))
-        .orElse(0);
-
-    @Test
-    void givenNumbers_whenUseComparisonResult_thenWillExecuteComparison() {
-        assertEquals(0, comparisonResult);
-    }
-
-    private boolean someCondition = true;
     Function<Number, ?> dynamicFunction = someCondition ? Number::doubleValue : Number::intValue;
     Comparator<Number> dynamicComparator = (num1, num2) -> ((Comparable) dynamicFunction.apply(num1)).compareTo(dynamicFunction.apply(num2));
 

core-java-modules/core-java-numbers-conversions/src/test/java/com/baeldung/floatdoubleconversions/FloatDoubleConversionsUnitTest.java

@@ -3,7 +3,7 @@ package com.baeldung.floatdoubleconversions;
 import org.junit.Assert;
 import org.junit.Test;
 
-public class FloatDoubleConversionsTest {
+public class FloatDoubleConversionsUnitTest {
 
     @Test
     public void whenDoubleType_thenFloatTypeSuccess(){

core-java-modules/core-java-optional/pom.xml

@@ -47,14 +47,14 @@
         <dependency>
             <groupId>io.rest-assured</groupId>
             <artifactId>json-path</artifactId>
-            <version>${rest-assured.version}</version>
+            <version>${json-path.version}</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
 
     <properties>
         <hibernate.core.version>5.4.0.Final</hibernate.core.version>
-        <rest-assured.version>3.1.1</rest-assured.version>
+        <json-path.version>5.3.2</json-path.version>
     </properties>
 
 </project>

core-java-modules/core-java-optional/src/test/java/com/baeldung/java9additions/Java9OptionalUnitTest.java

@@ -8,88 +8,88 @@ import java.util.Optional;
 import java.util.concurrent.atomic.AtomicInteger;
 import java.util.stream.Collectors;
 
-//    Uncomment code when code base is compatible with Java 9
+
-//public class Java9OptionalUnitTest {
+public class Java9OptionalUnitTest {
-//
+
-//    @Test
+    @Test
-//    public void givenOptionalOfSome_whenToStream_thenShouldTreatItAsOneElementStream() {
+    public void givenOptionalOfSome_whenToStream_thenShouldTreatItAsOneElementStream() {
-//        //given
+        //given
-//        Optional<String> value = Optional.of("a");
+        Optional<String> value = Optional.of("a");
-//
+
-//        //when
+        //when
-//        List<String> collect = value.stream().map(String::toUpperCase).collect(Collectors.toList());
+        List<String> collect = value.stream().map(String::toUpperCase).collect(Collectors.toList());
-//
+
-//        //then
+        //then
-//        assertThat(collect).hasSameElementsAs(List.of("A"));
+        assertThat(collect).hasSameElementsAs(List.of("A"));
-//    }
+    }
-//
+
-//    @Test
+    @Test
-//    public void givenOptionalOfNone_whenToStream_thenShouldTreatItAsZeroElementStream() {
+    public void givenOptionalOfNone_whenToStream_thenShouldTreatItAsZeroElementStream() {
-//        //given
+        //given
-//        Optional<String> value = Optional.empty();
+        Optional<String> value = Optional.empty();
-//
+
-//        //when
+        //when
-//        List<String> collect = value.stream().map(String::toUpperCase).collect(Collectors.toList());
+        List<String> collect = value.stream().map(String::toUpperCase).collect(Collectors.toList());
-//
+
-//        //then
+        //then
-//        assertThat(collect).isEmpty();
+        assertThat(collect).isEmpty();
-//    }
+    }
-//
+
-//    @Test
+    @Test
-//    public void givenOptional_whenPresent_thenShouldExecuteProperCallback() {
+    public void givenOptional_whenPresent_thenShouldExecuteProperCallback() {
-//        //given
+        //given
-//        Optional<String> value = Optional.of("properValue");
+        Optional<String> value = Optional.of("properValue");
-//        AtomicInteger successCounter = new AtomicInteger(0);
+        AtomicInteger successCounter = new AtomicInteger(0);
-//        AtomicInteger onEmptyOptionalCounter = new AtomicInteger(0);
+        AtomicInteger onEmptyOptionalCounter = new AtomicInteger(0);
-//
+
-//        //when
+        //when
-//        value.ifPresentOrElse((v) -> successCounter.incrementAndGet(), onEmptyOptionalCounter::incrementAndGet);
+        value.ifPresentOrElse((v) -> successCounter.incrementAndGet(), onEmptyOptionalCounter::incrementAndGet);
-//
+
-//        //then
+        //then
-//        assertThat(successCounter.get()).isEqualTo(1);
+        assertThat(successCounter.get()).isEqualTo(1);
-//        assertThat(onEmptyOptionalCounter.get()).isEqualTo(0);
+        assertThat(onEmptyOptionalCounter.get()).isEqualTo(0);
-//    }
+    }
-//
+
-//    @Test
+    @Test
-//    public void givenOptional_whenNotPresent_thenShouldExecuteProperCallback() {
+    public void givenOptional_whenNotPresent_thenShouldExecuteProperCallback() {
-//        //given
+        //given
-//        Optional<String> value = Optional.empty();
+        Optional<String> value = Optional.empty();
-//        AtomicInteger successCounter = new AtomicInteger(0);
+        AtomicInteger successCounter = new AtomicInteger(0);
-//        AtomicInteger onEmptyOptionalCounter = new AtomicInteger(0);
+        AtomicInteger onEmptyOptionalCounter = new AtomicInteger(0);
-//
+
-//        //when
+        //when
-//        value.ifPresentOrElse((v) -> successCounter.incrementAndGet(), onEmptyOptionalCounter::incrementAndGet);
+        value.ifPresentOrElse((v) -> successCounter.incrementAndGet(), onEmptyOptionalCounter::incrementAndGet);
-//
+
-//        //then
+        //then
-//        assertThat(successCounter.get()).isEqualTo(0);
+        assertThat(successCounter.get()).isEqualTo(0);
-//        assertThat(onEmptyOptionalCounter.get()).isEqualTo(1);
+        assertThat(onEmptyOptionalCounter.get()).isEqualTo(1);
-//    }
+    }
-//
+
-//    @Test
+    @Test
-//    public void givenOptional_whenPresent_thenShouldTakeAValueFromIt() {
+    public void givenOptional_whenPresent_thenShouldTakeAValueFromIt() {
-//        //given
+        //given
-//        String expected = "properValue";
+        String expected = "properValue";
-//        Optional<String> value = Optional.of(expected);
+        Optional<String> value = Optional.of(expected);
-//        Optional<String> defaultValue = Optional.of("default");
+        Optional<String> defaultValue = Optional.of("default");
-//
+
-//        //when
+        //when
-//        Optional<String> result = value.or(() -> defaultValue);
+        Optional<String> result = value.or(() -> defaultValue);
-//
+
-//        //then
+        //then
-//        assertThat(result.get()).isEqualTo(expected);
+        assertThat(result.get()).isEqualTo(expected);
-//    }
+    }
-//
+
-//    @Test
+    @Test
-//    public void givenOptional_whenEmpty_thenShouldTakeAValueFromOr() {
+    public void givenOptional_whenEmpty_thenShouldTakeAValueFromOr() {
-//        //given
+        //given
-//        String defaultString = "default";
+        String defaultString = "default";
-//        Optional<String> value = Optional.empty();
+        Optional<String> value = Optional.empty();
-//        Optional<String> defaultValue = Optional.of(defaultString);
+        Optional<String> defaultValue = Optional.of(defaultString);
-//
+
-//        //when
+        //when
-//        Optional<String> result = value.or(() -> defaultValue);
+        Optional<String> result = value.or(() -> defaultValue);
-//
+
-//        //then
+        //then
-//        assertThat(result.get()).isEqualTo(defaultString);
+        assertThat(result.get()).isEqualTo(defaultString);
-//    }
+    }
-//}
+}

core-java-modules/core-java-os-2/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>core-java-os</artifactId>
+    <artifactId>core-java-os-2</artifactId>
-    <name>core-java-os</name>
+    <name>core-java-os-2</name>
     <packaging>jar</packaging>
 
     <parent>

core-java-modules/core-java-records/README.md

@@ -1,2 +1,3 @@
 ## Relevant Articles
 - [Overriding hashCode() And equals() For Records](https://www.baeldung.com/java-override-hashcode-equals-records)
+- [Optional as a Record Parameter in Java](https://www.baeldung.com/java-record-optional-param)

core-java-modules/core-java-streams-5/README.md

@@ -5,3 +5,5 @@
 - [Streams vs. Loops in Java](https://www.baeldung.com/java-streams-vs-loops)
 - [Partition a Stream in Java](https://www.baeldung.com/java-partition-stream)
 - [Taking Every N-th Element from Finite and Infinite Streams in Java](https://www.baeldung.com/java-nth-element-finite-infinite-streams)
+- [Modifying Objects Within Stream While Iterating](https://www.baeldung.com/java-stream-modify-objects-during-iteration)
+- [Convert a Stream into a Map or Multimap in Java](https://www.baeldung.com/java-convert-stream-map-multimap)

core-java-modules/core-java-streams-simple/src/main/java/com/baeldung/streams/reduce/entities/User.java

@@ -4,6 +4,7 @@ public class User {
 
     private final String name;
     private final int age;
+    private final Rating rating = new Rating();
 
     public User(String name, int age) {
         this.name = name;
@@ -17,7 +18,11 @@ public class User {
     public int getAge() {
         return age;
     }
-    
+
+    public Rating getRating() {
+        return rating;
+    }
+
     @Override
     public String toString() {
         return "User{" + "name=" + name + ", age=" + age + '}';

core-java-modules/core-java-streams-simple/src/test/java/com/baeldung/streams/collectors/Java8CollectorsUnitTest.java

@@ -3,6 +3,7 @@ package com.baeldung.streams.collectors;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Sets;
+
 import org.junit.Test;
 
 import java.util.*;
@@ -23,142 +24,159 @@ public class Java8CollectorsUnitTest {
     private final List<String> listWithDuplicates = Arrays.asList("a", "bb", "c", "d", "bb");
 
     @Test
-    public void whenCollectingToList_shouldCollectToList() throws Exception {
+    public void whenCollectingToList_shouldCollectToList() {
-        final List<String> result = givenList.stream().collect(toList());
+        final List<String> result = givenList.stream()
+            .collect(toList());
 
         assertThat(result).containsAll(givenList);
     }
 
     @Test
     public void whenCollectingToUnmodifiableList_shouldCollectToUnmodifiableList() {
-        final List<String> result = givenList.stream().collect(toUnmodifiableList());
+        final List<String> result = givenList.stream()
+            .collect(toUnmodifiableList());
 
-        assertThatThrownBy(() -> result.add("foo"))
+        assertThatThrownBy(() -> result.add("foo")).isInstanceOf(UnsupportedOperationException.class);
-          .isInstanceOf(UnsupportedOperationException.class);
     }
 
     @Test
-    public void whenCollectingToSet_shouldCollectToSet() throws Exception {
+    public void whenCollectingToSet_shouldCollectToSet() {
-        final Set<String> result = givenList.stream().collect(toSet());
+        final Set<String> result = givenList.stream()
+            .collect(toSet());
 
         assertThat(result).containsAll(givenList);
     }
 
     @Test
     public void whenCollectingToUnmodifiableSet_shouldCollectToUnmodifiableSet() {
-        final Set<String> result = givenList.stream().collect(toUnmodifiableSet());
+        final Set<String> result = givenList.stream()
+            .collect(toUnmodifiableSet());
 
-        assertThatThrownBy(() -> result.add("foo"))
+        assertThatThrownBy(() -> result.add("foo")).isInstanceOf(UnsupportedOperationException.class);
-          .isInstanceOf(UnsupportedOperationException.class);
     }
 
     @Test
     public void givenContainsDuplicateElements_whenCollectingToSet_shouldAddDuplicateElementsOnlyOnce() throws Exception {
-        final Set<String> result = listWithDuplicates.stream().collect(toSet());
+        final Set<String> result = listWithDuplicates.stream()
+            .collect(toSet());
 
         assertThat(result).hasSize(4);
     }
 
     @Test
-    public void whenCollectingToCollection_shouldCollectToCollection() throws Exception {
+    public void whenCollectingToCollection_shouldCollectToCollection() {
-        final List<String> result = givenList.stream().collect(toCollection(LinkedList::new));
+        final List<String> result = givenList.stream()
+            .collect(toCollection(LinkedList::new));
 
-        assertThat(result).containsAll(givenList).isInstanceOf(LinkedList.class);
+        assertThat(result).containsAll(givenList)
+            .isInstanceOf(LinkedList.class);
     }
 
     @Test
-    public void whenCollectingToImmutableCollection_shouldThrowException() throws Exception {
+    public void whenCollectingToImmutableCollection_shouldThrowException() {
         assertThatThrownBy(() -> {
-            givenList.stream().collect(toCollection(ImmutableList::of));
+            givenList.stream()
+                .collect(toCollection(ImmutableList::of));
         }).isInstanceOf(UnsupportedOperationException.class);
 
     }
 
     @Test
-    public void whenCollectingToMap_shouldCollectToMap() throws Exception {
+    public void whenCollectingToMap_shouldCollectToMap() {
-        final Map<String, Integer> result = givenList.stream().collect(toMap(Function.identity(), String::length));
+        final Map<String, Integer> result = givenList.stream()
+            .collect(toMap(Function.identity(), String::length));
 
-        assertThat(result).containsEntry("a", 1).containsEntry("bb", 2).containsEntry("ccc", 3).containsEntry("dd", 2);
+        assertThat(result).containsEntry("a", 1)
+            .containsEntry("bb", 2)
+            .containsEntry("ccc", 3)
+            .containsEntry("dd", 2);
     }
 
     @Test
     public void whenCollectingToUnmodifiableMap_shouldCollectToUnmodifiableMap() {
         final Map<String, Integer> result = givenList.stream()
-          .collect(toUnmodifiableMap(Function.identity(), String::length));
+            .collect(toUnmodifiableMap(Function.identity(), String::length));
 
-        assertThatThrownBy(() -> result.put("foo", 3))
+        assertThatThrownBy(() -> result.put("foo", 3)).isInstanceOf(UnsupportedOperationException.class);
-                .isInstanceOf(UnsupportedOperationException.class);
     }
 
     @Test
     public void whenCollectingToMapwWithDuplicates_shouldCollectToMapMergingTheIdenticalItems() throws Exception {
-        final Map<String, Integer> result = listWithDuplicates.stream().collect(
+        final Map<String, Integer> result = listWithDuplicates.stream()
-          toMap(
+            .collect(toMap(Function.identity(), String::length, (item, identicalItem) -> item));
-            Function.identity(),
-            String::length,
-            (item, identicalItem) -> item
-          )
-        );
 
-        assertThat(result).containsEntry("a", 1).containsEntry("bb", 2).containsEntry("c", 1).containsEntry("d", 1);
+        assertThat(result).containsEntry("a", 1)
+            .containsEntry("bb", 2)
+            .containsEntry("c", 1)
+            .containsEntry("d", 1);
     }
 
     @Test
-    public void givenContainsDuplicateElements_whenCollectingToMap_shouldThrowException() throws Exception {
+    public void givenContainsDuplicateElements_whenCollectingToMap_shouldThrowException() {
         assertThatThrownBy(() -> {
-            listWithDuplicates.stream().collect(toMap(Function.identity(), String::length));
+            listWithDuplicates.stream()
+                .collect(toMap(Function.identity(), String::length));
         }).isInstanceOf(IllegalStateException.class);
     }
 
     @Test
-    public void whenCollectingAndThen_shouldCollect() throws Exception {
+    public void whenCollectingAndThen_shouldCollect() {
-        final List<String> result = givenList.stream().collect(collectingAndThen(toList(), ImmutableList::copyOf));
+        final List<String> result = givenList.stream()
+            .collect(collectingAndThen(toList(), ImmutableList::copyOf));
 
-        assertThat(result).containsAll(givenList).isInstanceOf(ImmutableList.class);
+        assertThat(result).containsAll(givenList)
+            .isInstanceOf(ImmutableList.class);
     }
 
     @Test
-    public void whenJoining_shouldJoin() throws Exception {
+    public void whenJoining_shouldJoin() {
-        final String result = givenList.stream().collect(joining());
+        final String result = givenList.stream()
+            .collect(joining());
 
         assertThat(result).isEqualTo("abbcccdd");
     }
 
     @Test
-    public void whenJoiningWithSeparator_shouldJoinWithSeparator() throws Exception {
+    public void whenJoiningWithSeparator_shouldJoinWithSeparator() {
-        final String result = givenList.stream().collect(joining(" "));
+        final String result = givenList.stream()
+            .collect(joining(" "));
 
         assertThat(result).isEqualTo("a bb ccc dd");
     }
 
     @Test
-    public void whenJoiningWithSeparatorAndPrefixAndPostfix_shouldJoinWithSeparatorPrePost() throws Exception {
+    public void whenJoiningWithSeparatorAndPrefixAndPostfix_shouldJoinWithSeparatorPrePost() {
-        final String result = givenList.stream().collect(joining(" ", "PRE-", "-POST"));
+        final String result = givenList.stream()
+            .collect(joining(" ", "PRE-", "-POST"));
 
         assertThat(result).isEqualTo("PRE-a bb ccc dd-POST");
     }
 
     @Test
-    public void whenPartitioningBy_shouldPartition() throws Exception {
+    public void whenPartitioningBy_shouldPartition() {
-        final Map<Boolean, List<String>> result = givenList.stream().collect(partitioningBy(s -> s.length() > 2));
+        final Map<Boolean, List<String>> result = givenList.stream()
+            .collect(partitioningBy(s -> s.length() > 2));
 
-        assertThat(result).containsKeys(true, false).satisfies(booleanListMap -> {
+        assertThat(result).containsKeys(true, false)
-            assertThat(booleanListMap.get(true)).contains("ccc");
+            .satisfies(booleanListMap -> {
+                assertThat(booleanListMap.get(true)).contains("ccc");
 
-            assertThat(booleanListMap.get(false)).contains("a", "bb", "dd");
+                assertThat(booleanListMap.get(false)).contains("a", "bb", "dd");
-        });
+            });
     }
 
     @Test
-    public void whenCounting_shouldCount() throws Exception {
+    public void whenCounting_shouldCount() {
-        final Long result = givenList.stream().collect(counting());
+        final Long result = givenList.stream()
+            .collect(counting());
 
         assertThat(result).isEqualTo(4);
     }
 
     @Test
-    public void whenSummarizing_shouldSummarize() throws Exception {
+    public void whenSummarizing_shouldSummarize() {
-        final DoubleSummaryStatistics result = givenList.stream().collect(summarizingDouble(String::length));
+        final DoubleSummaryStatistics result = givenList.stream()
+            .collect(summarizingDouble(String::length));
 
         assertThat(result.getAverage()).isEqualTo(2);
         assertThat(result.getCount()).isEqualTo(4);
@@ -168,38 +186,47 @@ public class Java8CollectorsUnitTest {
     }
 
     @Test
-    public void whenAveraging_shouldAverage() throws Exception {
+    public void whenAveraging_shouldAverage() {
-        final Double result = givenList.stream().collect(averagingDouble(String::length));
+        final Double result = givenList.stream()
+            .collect(averagingDouble(String::length));
 
         assertThat(result).isEqualTo(2);
     }
 
     @Test
-    public void whenSumming_shouldSum() throws Exception {
+    public void whenSumming_shouldSum() {
-        final Double result = givenList.stream().filter(i -> true).collect(summingDouble(String::length));
+        final Double result = givenList.stream()
+            .collect(summingDouble(String::length));
 
         assertThat(result).isEqualTo(8);
     }
 
     @Test
-    public void whenMaxingBy_shouldMaxBy() throws Exception {
+    public void whenMaxingBy_shouldMaxBy() {
-        final Optional<String> result = givenList.stream().collect(maxBy(Comparator.naturalOrder()));
+        final Optional<String> result = givenList.stream()
+            .collect(maxBy(Comparator.naturalOrder()));
 
-        assertThat(result).isPresent().hasValue("dd");
+        assertThat(result).isPresent()
+            .hasValue("dd");
     }
 
     @Test
-    public void whenGroupingBy_shouldGroupBy() throws Exception {
+    public void whenGroupingBy_shouldGroupBy() {
-        final Map<Integer, Set<String>> result = givenList.stream().collect(groupingBy(String::length, toSet()));
+        final Map<Integer, Set<String>> result = givenList.stream()
+            .collect(groupingBy(String::length, toSet()));
 
-        assertThat(result).containsEntry(1, newHashSet("a")).containsEntry(2, newHashSet("bb", "dd")).containsEntry(3, newHashSet("ccc"));
+        assertThat(result).containsEntry(1, newHashSet("a"))
+            .containsEntry(2, newHashSet("bb", "dd"))
+            .containsEntry(3, newHashSet("ccc"));
     }
 
     @Test
-    public void whenCreatingCustomCollector_shouldCollect() throws Exception {
+    public void whenCreatingCustomCollector_shouldCollect() {
-        final ImmutableSet<String> result = givenList.stream().collect(toImmutableSet());
+        final ImmutableSet<String> result = givenList.stream()
+            .collect(toImmutableSet());
 
-        assertThat(result).isInstanceOf(ImmutableSet.class).contains("a", "bb", "ccc", "dd");
+        assertThat(result).isInstanceOf(ImmutableSet.class)
+            .contains("a", "bb", "ccc", "dd");
 
     }
 

core-java-modules/core-java-streams-simple/src/test/java/com/baeldung/streams/reduce/StreamReduceManualTest.java

@@ -1,15 +1,18 @@
-package com.baeldung.streamreduce.tests;
+package com.baeldung.streams.reduce;
+
+import static org.assertj.core.api.Assertions.assertThat;
 
-import com.baeldung.streamreduce.entities.Rating;
-import com.baeldung.streamreduce.entities.Review;
-import com.baeldung.streamreduce.entities.User;
-import com.baeldung.streamreduce.utilities.NumberUtils;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
-import static org.assertj.core.api.Assertions.assertThat;
+
 import org.junit.Test;
 
+import com.baeldung.streams.reduce.entities.Rating;
+import com.baeldung.streams.reduce.entities.Review;
+import com.baeldung.streams.reduce.entities.User;
+import com.baeldung.streams.reduce.utilities.NumberUtils;
+
 public class StreamReduceManualTest {
 
     @Test

core-java-modules/core-java-string-apis-2/README.md

@@ -6,4 +6,6 @@ This module contains articles about string APIs.
 - [Retain Only Digits and Decimal Separator in String](https://www.baeldung.com/java-string-retain-digits-decimal)
 - [Difference Between null and Empty String in Java](https://www.baeldung.com/java-string-null-vs-empty)
 - [Guide to Java String Pool](https://www.baeldung.com/java-string-pool)
-- [Java Localization – Formatting Messages](https://www.baeldung.com/java-localization-messages-formatting)
+- [Java Localization – Formatting Messages](https://www.baeldung.com/java-localization-messages-formatting)
+- [Compare StringBuilder Objects in Java](https://www.baeldung.com/java-stringbuilder-objects-comparison)
+- [Finding the N-th Occurrence of a Substring in a String in Java](https://www.baeldung.com/java-locate-nth-match-substring)

core-java-modules/core-java-string-apis-2/src/main/java/com/baeldung/diffstringstringbuffer/MemoryAddress.java

@@ -0,0 +1,33 @@
+package com.baeldung.diffstringstringbuffer;
+
+import java.lang.reflect.Field;
+
+import sun.misc.Unsafe;
+
+public class MemoryAddress {
+    public long getMemoryAddress(Object object) {
+        Object[] arrayOfObject = new Object[]{object};
+        Unsafe unsafe = null;
+        try {
+            Field field = Unsafe.class.getDeclaredField("theUnsafe");
+            field.setAccessible(true);
+            unsafe = (Unsafe) field.get(null);
+        } catch (NoSuchFieldException | IllegalAccessException e) {
+            e.printStackTrace();
+        }
+        assert unsafe != null;
+        long arrayBaseOffset = unsafe.arrayBaseOffset(Object[].class);
+        int addressSize = unsafe.addressSize();
+        long objectAddress;
+        if (addressSize == 4) {
+            objectAddress = unsafe.getInt(arrayOfObject, arrayBaseOffset);
+        } else {
+            if (addressSize == 8) {
+                objectAddress = unsafe.getLong(arrayOfObject, arrayBaseOffset);
+            } else {
+                throw new Error("Error: Size not supported: " + addressSize);
+            }
+        }
+        return objectAddress;
+    }
+}

core-java-modules/core-java-string-apis-2/src/test/java/com/baeldung/diffstringstringbuffer/StringBufferUnitTest.java

@@ -0,0 +1,18 @@
+package com.baeldung.diffstringstringbuffer;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class StringBufferUnitTest {
+    @Test
+    void whenStringBufferVariableIsReassigned_thenVariableRetainsOriginalMemoryAddress() {
+        MemoryAddress memoryAddress = new MemoryAddress();
+        StringBuffer stringBuffer = new StringBuffer("DownTown");
+        long address1 = memoryAddress.getMemoryAddress(stringBuffer);
+        stringBuffer.insert(0, "Coder");
+        assertEquals(stringBuffer.toString(), "CoderDownTown");
+        long address2 = memoryAddress.getMemoryAddress(stringBuffer);
+        assertEquals(address1, address2);
+    }
+}

core-java-modules/core-java-string-apis-2/src/test/java/com/baeldung/diffstringstringbuffer/StringUnitTest.java

@@ -0,0 +1,29 @@
+package com.baeldung.diffstringstringbuffer;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+
+import org.junit.jupiter.api.Test;
+
+public class StringUnitTest {
+    @Test
+    void whenStringVariableIsReassigned_thenVariableGetsNewMemoryAddress() {
+        MemoryAddress memoryAddress = new MemoryAddress();
+        String s1 = "DownTown";
+        long address1 = memoryAddress.getMemoryAddress(s1);
+        s1 = "Coder";
+        long address2 = memoryAddress.getMemoryAddress(s1);
+        assertNotEquals(address1, address2);
+    }
+
+    @Test
+    void whenStringsAreIncludedInAStringBuffer_thenThoseStringsRemainImmutable() {
+        String s1 = "TopCat";
+        StringBuffer stringBuffer = new StringBuffer("DownTown");
+        stringBuffer.append(s1);
+        stringBuffer.reverse();
+        assertNotEquals(s1, "taCpoT");
+        stringBuffer.delete(0, 3);
+        assertEquals(s1, "TopCat");
+    }
+}

core-java-modules/core-java-string-operations-2/pom.xml

@@ -14,11 +14,6 @@
     </parent>
 
     <dependencies>
-        <dependency>
-            <groupId>javax.validation</groupId>
-            <artifactId>validation-api</artifactId>
-            <version>${validation-api.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
@@ -30,14 +25,9 @@
             <version>${hibernate-validator.version}</version>
         </dependency>
         <dependency>
-            <groupId>javax.el</groupId>
+            <groupId>org.glassfish.expressly</groupId>
-            <artifactId>javax.el-api</artifactId>
+            <artifactId>expressly</artifactId>
-            <version>${javax.el-api.version}</version>
+            <version>${expressly.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.glassfish.web</groupId>
-            <artifactId>javax.el</artifactId>
-            <version>${javax.el.version}</version>
         </dependency>
         <dependency>
             <groupId>org.openjdk.jmh</groupId>
@@ -95,10 +85,8 @@
     </build>
 
     <properties>
-        <validation-api.version>2.0.0.Final</validation-api.version>
+        <hibernate-validator.version>8.0.1.Final</hibernate-validator.version>
-        <hibernate-validator.version>6.0.2.Final</hibernate-validator.version>
+        <expressly.version>5.0.0</expressly.version>
-        <javax.el-api.version>3.0.0</javax.el-api.version>
-        <javax.el.version>2.2.6</javax.el.version>
         <commons-codec.version>1.14</commons-codec.version>
         <spring-core.version>5.3.0</spring-core.version>
     </properties>

core-java-modules/core-java-string-operations-2/src/main/java/com/baeldung/emptystrings/SomeClassWithValidations.java

@@ -1,6 +1,6 @@
 package com.baeldung.emptystrings;
 
-import javax.validation.constraints.Pattern;
+import jakarta.validation.constraints.Pattern;
 
 class SomeClassWithValidations {
 

core-java-modules/core-java-string-operations-2/src/test/java/com/baeldung/emptystrings/EmptyStringsUnitTest.java

@@ -5,10 +5,10 @@ import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
 import org.springframework.util.ObjectUtils;
 
-import javax.validation.ConstraintViolation;
+import jakarta.validation.ConstraintViolation;
-import javax.validation.Validation;
+import jakarta.validation.Validation;
-import javax.validation.Validator;
+import jakarta.validation.Validator;
-import javax.validation.ValidatorFactory;
+import jakarta.validation.ValidatorFactory;
 import java.util.Set;
 
 import static org.hamcrest.Matchers.iterableWithSize;

core-java-modules/core-java-string-operations-7/README.md

@@ -2,3 +2,4 @@
 ### Relevant Articles:
 - [How to Center Text Output in Java](https://www.baeldung.com/java-center-text-output)
 - [Capitalize the First Letter of Each Word in a String](https://www.baeldung.com/java-string-initial-capital-letter-every-word)
+- [Check if a String Contains Only Unicode Letters](https://www.baeldung.com/java-string-all-unicode-characters)

core-java-modules/core-java-sun/shared-mem-test1.bat

@@ -0,0 +1,8 @@
+@rem This bat file starts the consumer and producer (more or less) at the same time
+cd target\classes
+rem start java --add-opens java.base/java.nio=ALL-UNNAMED com.baeldung.sharedmem.ProducerApp c:\lixo\sharedmem.bin 65536
+rem start java --add-opens java.base/java.nio=ALL-UNNAMED com.baeldung.sharedmem.ConsumerApp c:\lixo\sharedmem.bin 65536
+start %JAVA_HOME%\bin\java com.baeldung.sharedmem.ProducerApp c:\lixo\sharedmem.bin 65536
+start %JAVA_HOME%\bin\java com.baeldung.sharedmem.ConsumerApp c:\lixo\sharedmem.bin 65536
+cd ..
+cd ..

core-java-modules/core-java-sun/shared-mem-test2.bat

@@ -0,0 +1,10 @@
+@rem This bat file starts the consumer and producer (more or less) at the same time
+del target\sharedmem.bin
+echo "" > target\sharedmem.bin
+cd target\classes
+rem start java --add-opens java.base/java.nio=ALL-UNNAMED com.baeldung.sharedmem.ProducerAppWithSpinLock ..\sharedmem.bin 65536
+rem start java --add-opens java.base/java.nio=ALL-UNNAMED com.baeldung.sharedmem.ConsumerAppWithSpinLock ..\sharedmem.bin 65536
+start %JAVA_HOME%\bin\java com.baeldung.sharedmem.ProducerAppWithSpinLock ..\sharedmem.bin 65536
+start %JAVA_HOME%\bin\java com.baeldung.sharedmem.ConsumerAppWithSpinLock ..\sharedmem.bin 65536
+cd ..
+cd ..

core-java-modules/core-java-sun/src/main/java/com/baeldung/park/ThreadMonitorInfo.java

@@ -0,0 +1,26 @@
+package com.baeldung.park;
+
+import java.util.concurrent.locks.LockSupport;
+
+public class ThreadMonitorInfo {
+    private static final Object MONITOR = new Object();
+    public static void main(String[] args) throws InterruptedException {
+        final Thread waitingThread = new Thread(() -> {
+            try {
+                synchronized (MONITOR) {
+                    MONITOR.wait();
+                }
+            } catch (InterruptedException e) {
+                throw new RuntimeException(e);
+            }
+        }, "Waiting Thread");
+
+        final Thread parkedThread = new Thread(LockSupport::park, "Parked Thread");
+
+        waitingThread.start();
+        parkedThread.start();
+
+        waitingThread.join();
+        parkedThread.join();
+    }
+}

core-java-modules/core-java-sun/src/main/java/com/baeldung/sharedmem/ConsumerApp.java

@@ -0,0 +1,94 @@
+package com.baeldung.sharedmem;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.nio.MappedByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.file.Files;
+import java.nio.file.StandardOpenOption;
+import java.security.MessageDigest;
+import java.util.Arrays;
+import java.util.EnumSet;
+import java.util.Random;
+
+public class ConsumerApp {
+
+    public static void main(String[] args) throws Exception {
+
+        MessageDigest digest = MessageDigest.getInstance("SHA1");
+        digest.digest(new byte[256]);
+        byte[] dummy = digest.digest();
+        int hashLen = dummy.length;
+
+        System.out.println("Starting consumer iterations...");
+
+        long size = Long.parseLong(args[1]);
+        MappedByteBuffer shm = createSharedMemory(args[0], size + hashLen);
+        long start = System.currentTimeMillis();
+        long iterations = 0;
+        int capacity = shm.capacity();
+
+        long matchCount = 0;
+        long mismatchCount = 0;
+        byte[] expectedHash = new byte[hashLen];
+
+        while (System.currentTimeMillis() - start < 30_000) {
+
+            for (int i = 0; i < capacity - hashLen; i++) {
+                byte value = shm.get(i);
+                digest.update(value);
+            }
+
+            byte[] hash = digest.digest();
+            shm.position(capacity-hashLen);
+            shm.get(expectedHash);
+
+            if (Arrays.equals(hash, expectedHash)) {
+                matchCount++;
+            } else {
+                mismatchCount++;
+            }
+
+            iterations++;
+        }
+
+        System.out.printf("%d iterations run. matches=%d, mismatches=%d\n", iterations, matchCount, mismatchCount);
+        System.out.println("Press <enter> to exit");
+        System.console()
+          .readLine();
+    }
+
+    private static MappedByteBuffer createSharedMemory(String path, long size) {
+
+        try (FileChannel fc = (FileChannel) Files.newByteChannel(
+          new File(path).toPath(),
+          EnumSet.of(
+            StandardOpenOption.CREATE,
+            StandardOpenOption.SPARSE,
+            StandardOpenOption.WRITE,
+            StandardOpenOption.READ))) {
+            return fc.map(FileChannel.MapMode.READ_WRITE, 0, size);
+
+        } catch (IOException ioe) {
+            throw new RuntimeException(ioe);
+        }
+    }
+
+    private static long getBufferAddress(MappedByteBuffer shm) {
+        try {
+            Class<?> cls = shm.getClass();
+            Method maddr = cls.getMethod("address");
+            maddr.setAccessible(true);
+            Long addr = (Long) maddr.invoke(shm);
+            if (addr == null) {
+                throw new RuntimeException("Unable to retrieve buffer's address");
+            }
+            return addr;
+        } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException ex) {
+            throw new RuntimeException(ex);
+        }
+    }
+
+}

core-java-modules/core-java-sun/src/main/java/com/baeldung/sharedmem/ConsumerAppWithSpinLock.java

@@ -0,0 +1,119 @@
+package com.baeldung.sharedmem;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.nio.MappedByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.file.Files;
+import java.nio.file.StandardOpenOption;
+import java.security.MessageDigest;
+import java.util.Arrays;
+import java.util.EnumSet;
+import java.util.Random;
+
+public class ConsumerAppWithSpinLock {
+
+    public static void main(String[] args) {
+        try {
+            // Small wait to ensure the Producer gets the first round. Otherwise the hash will be invalid
+            Thread.sleep(1000);
+            run(args);
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        } finally {
+            System.console()
+              .printf("Press <enter> to continue");
+            System.console()
+              .readLine();
+        }
+    }
+
+    private static void run(String args[]) throws Exception {
+
+        MessageDigest digest = MessageDigest.getInstance("SHA1");
+        digest.digest(new byte[256]);
+        byte[] dummy = digest.digest();
+        int hashLen = dummy.length;
+
+        long size = Long.parseLong(args[1]);
+        MappedByteBuffer shm = createSharedMemory(args[0], size + hashLen);
+        long addr = getBufferAddress(shm);
+
+        System.out.printf("Buffer address: 0x%08x\n", addr);
+
+        Random rnd = new Random();
+
+        long start = System.currentTimeMillis();
+        long iterations = 0;
+        int capacity = shm.capacity();
+        System.out.println("Starting consumer iterations...");
+
+        long matchCount = 0;
+        long mismatchCount = 0;
+        byte[] expectedHash = new byte[hashLen];
+        SpinLock lock = new SpinLock(addr);
+
+        while (System.currentTimeMillis() - start < 30_000) {
+
+            if (!lock.tryLock(5_000)) {
+                throw new RuntimeException("Unable to acquire lock");
+            }
+
+            try {
+                for (int i = 4; i < capacity - hashLen; i++) {
+                    byte value = shm.get(i);
+                    digest.update(value);
+                }
+
+                byte[] hash = digest.digest();
+                shm.position(capacity-hashLen);
+                shm.get(expectedHash);
+
+                if (Arrays.equals(hash, expectedHash)) {
+                    matchCount++;
+                } else {
+                    mismatchCount++;
+                }
+
+                iterations++;
+            } finally {
+                lock.unlock();
+            }
+        }
+
+        System.out.printf("%d iteractions run. matches=%d, mismatches=%d\n", iterations, matchCount, mismatchCount);
+    }
+
+    private static MappedByteBuffer createSharedMemory(String path, long size) {
+
+        try (FileChannel fc = (FileChannel) Files.newByteChannel(
+          new File(path).toPath(),
+          EnumSet.of(
+            StandardOpenOption.CREATE,
+            StandardOpenOption.SPARSE,
+            StandardOpenOption.WRITE,
+            StandardOpenOption.READ))) {
+            return fc.map(FileChannel.MapMode.READ_WRITE, 0, size);
+        } catch (IOException ioe) {
+            throw new RuntimeException(ioe);
+        }
+    }
+
+    private static long getBufferAddress(MappedByteBuffer shm) {
+        try {
+            Class<?> cls = shm.getClass();
+            Method maddr = cls.getMethod("address");
+            maddr.setAccessible(true);
+            Long addr = (Long) maddr.invoke(shm);
+            if (addr == null) {
+                throw new RuntimeException("Unable to retrieve buffer's address");
+            }
+            return addr;
+        } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException ex) {
+            throw new RuntimeException(ex);
+        }
+    }
+
+}

core-java-modules/core-java-sun/src/main/java/com/baeldung/sharedmem/ProducerApp.java

@@ -0,0 +1,89 @@
+package com.baeldung.sharedmem;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.nio.MappedByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.file.Files;
+import java.nio.file.StandardOpenOption;
+import java.security.MessageDigest;
+import java.util.EnumSet;
+import java.util.Random;
+
+public class ProducerApp {
+
+
+    public static void main(String[] args) throws Exception {
+
+        MessageDigest digest = MessageDigest.getInstance("SHA1");
+        digest.digest(new byte[256]);
+        byte[] dummy = digest.digest();
+        int hashLen = dummy.length;
+
+
+        long size = Long.parseLong(args[1]);
+        MappedByteBuffer shm = createSharedMemory(args[0],  size + hashLen);
+
+        System.out.println("Starting producer iterations...");
+
+        long start = System.currentTimeMillis();
+        long iterations = 0;
+        int capacity = shm.capacity();
+        Random rnd = new Random();
+
+        while(System.currentTimeMillis() - start < 30000) {
+
+            for (int i = 0; i < capacity - hashLen; i++) {
+                byte value = (byte) (rnd.nextInt(256) & 0x00ff);
+                digest.update(value);
+                shm.put(i, value);
+            }
+
+            // Write hash at the end
+            byte[] hash = digest.digest();
+            shm.position(capacity - hashLen);
+            shm.put(hash);
+            iterations++;
+        }
+
+        System.out.printf("%d iterations run\n", iterations);
+        System.out.println("Press <enter> to exit");
+        System.console().readLine();
+
+    }
+
+    private static long getBufferAddress(MappedByteBuffer shm) {
+        try {
+            Class<?> cls = shm.getClass();
+            Method maddr = cls.getMethod("address");
+            maddr.setAccessible(true);
+            Long addr = (Long) maddr.invoke(shm);
+            if ( addr == null ) {
+                throw new RuntimeException("Unable to retrieve buffer's address");
+            }
+            return addr;
+        }
+        catch( NoSuchMethodException | InvocationTargetException | IllegalAccessException ex) {
+            throw new RuntimeException(ex);
+        }
+    }
+
+    private static MappedByteBuffer createSharedMemory(String path, long size) {
+
+        try (FileChannel fc = (FileChannel)Files.newByteChannel(new File(path).toPath(),
+          EnumSet.of(
+            StandardOpenOption.CREATE,
+            StandardOpenOption.SPARSE,
+            StandardOpenOption.WRITE,
+            StandardOpenOption.READ))) {
+
+            return fc.map(FileChannel.MapMode.READ_WRITE, 0, size);
+        }
+        catch( IOException ioe) {
+            throw new RuntimeException(ioe);
+        }
+    }
+
+}

core-java-modules/core-java-sun/src/main/java/com/baeldung/sharedmem/ProducerAppWithSpinLock.java

@@ -0,0 +1,117 @@
+package com.baeldung.sharedmem;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.nio.MappedByteBuffer;
+import java.nio.channels.FileChannel;
+import java.nio.file.Files;
+import java.nio.file.StandardOpenOption;
+import java.security.MessageDigest;
+import java.util.EnumSet;
+import java.util.Random;
+
+public class ProducerAppWithSpinLock {
+
+    public static void main(String[] args) {
+        try {
+            run(args);
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        } finally {
+            System.console()
+              .printf("Press <enter> to continue");
+            System.console()
+              .readLine();
+        }
+    }
+
+
+    public static void run(String[] args) throws Exception {
+
+        MessageDigest digest = MessageDigest.getInstance("SHA1");
+        digest.digest(new byte[256]);
+        byte[] dummy = digest.digest();
+        int hashLen = dummy.length;
+
+
+        long size = Long.parseLong(args[1]);
+        MappedByteBuffer shm = createSharedMemory(args[0],  size + hashLen);
+
+        // Cleanup lock area
+        shm.putInt(0,0);
+
+        long addr = getBufferAddress(shm);
+        System.out.printf("Buffer address: 0x%08x\n",addr);
+        Random rnd = new Random();
+
+        long start = System.currentTimeMillis();
+        long iterations = 0;
+        int capacity = shm.capacity();
+        System.out.println("Starting producer iterations...");
+        SpinLock lock = new SpinLock(addr);
+        while(System.currentTimeMillis() - start < 30000) {
+
+            if(!lock.tryLock(5000)) {
+                throw new RuntimeException("Unable to acquire lock");
+            }
+
+            try {
+                // Skip the first 4 bytes, as they're used by the lock
+                for (int i = 4; i < capacity - hashLen; i++) {
+                    byte value = (byte) (rnd.nextInt(256) & 0x00ff);
+                    digest.update(value);
+                    shm.put(i, value);
+                }
+
+                // Write hash at the end
+                byte[] hash = digest.digest();
+                shm.position(capacity-hashLen);
+                shm.put(hash);
+                iterations++;
+            }
+            finally {
+                lock.unlock();
+            }
+        }
+
+        System.out.printf("%d iterations run\n", iterations);
+
+    }
+
+    private static long getBufferAddress(MappedByteBuffer shm) {
+        try {
+            Class<?> cls = shm.getClass();
+            Method maddr = cls.getMethod("address");
+            maddr.setAccessible(true);
+            Long addr = (Long) maddr.invoke(shm);
+            if ( addr == null ) {
+                throw new RuntimeException("Unable to retrieve buffer's address");
+            }
+            return addr;
+        }
+        catch( NoSuchMethodException | InvocationTargetException | IllegalAccessException ex) {
+            throw new RuntimeException(ex);
+        }
+    }
+
+    private static MappedByteBuffer createSharedMemory(String path, long size) {
+
+        try (FileChannel fc = (FileChannel)Files.newByteChannel(new File(path).toPath(),
+          EnumSet.of(
+            StandardOpenOption.CREATE,
+            StandardOpenOption.SPARSE,
+            StandardOpenOption.WRITE,
+            StandardOpenOption.READ))) {
+
+            return  fc.map(FileChannel.MapMode.READ_WRITE, 0, size);
+
+        }
+        catch( IOException ioe) {
+            throw new RuntimeException(ioe);
+        }
+
+    }
+
+}

core-java-modules/core-java-sun/src/main/java/com/baeldung/sharedmem/SpinLock.java

@@ -0,0 +1,43 @@
+package com.baeldung.sharedmem;
+
+//import sun.misc.Unsafe;
+
+import java.lang.reflect.Field;
+
+import sun.misc.Unsafe;
+
+public class SpinLock {
+    private static final Unsafe unsafe;
+
+    static {
+        try {
+            Field f = Unsafe.class.getDeclaredField("theUnsafe");
+            f.setAccessible(true);
+            unsafe = (Unsafe) f.get(null);
+        }
+        catch(NoSuchFieldException | IllegalAccessException ex) {
+            throw new RuntimeException(ex);
+        }
+    }
+
+    private final long addr;
+
+    public SpinLock(long addr) {
+        this.addr = addr;
+    }
+
+    public boolean tryLock(long maxWait) {
+        long deadline = System.currentTimeMillis() + maxWait;
+        while(System.currentTimeMillis() < deadline ) {
+            if ( unsafe.compareAndSwapInt(null,addr,0,1)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public void unlock() {
+        unsafe.putInt(addr,0);
+    }
+
+}

core-java-modules/core-java-sun/src/test/java/com/baeldung/park/PreemptivePermitsBehaviorUnitTest.java

@@ -0,0 +1,27 @@
+package com.baeldung.park;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.time.Duration;
+import java.time.temporal.ChronoUnit;
+import java.util.concurrent.locks.LockSupport;
+import org.junit.jupiter.api.Test;
+
+class PreemptivePermitsBehaviorUnitTest {
+
+    private final Thread parkedThread = new Thread() {
+        @Override
+        public void run() {
+            LockSupport.unpark(this);
+            LockSupport.park();
+        }
+    };
+
+    @Test
+    void givenThreadWhenPreemptivePermitShouldNotPark() {
+        assertTimeoutPreemptively(Duration.of(1, ChronoUnit.SECONDS), () -> {
+            parkedThread.start();
+            parkedThread.join();
+        });
+    }
+}

core-java-modules/core-java-sun/src/test/java/com/baeldung/park/RepeatedPreemptivePermitsBehaviorUnitTest.java

@@ -0,0 +1,43 @@
+package com.baeldung.park;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.TimeoutException;
+import java.util.concurrent.locks.LockSupport;
+import org.junit.jupiter.api.Test;
+
+class RepeatedPreemptivePermitsBehaviorUnitTest {
+
+    private final Thread parkedThread = new Thread() {
+        @Override
+        public void run() {
+            LockSupport.unpark(this);
+            LockSupport.unpark(this);
+            LockSupport.park();
+            LockSupport.park();
+        }
+    };
+
+    @Test
+    void givenThreadWhenRepeatedPreemptivePermitShouldPark() {
+        Callable<Boolean> callable = () -> {
+            parkedThread.start();
+            parkedThread.join();
+            return true;
+        };
+
+        boolean result = false;
+        final Future<Boolean> future = Executors.newSingleThreadExecutor().submit(callable);
+        try {
+            result = future.get(1, TimeUnit.SECONDS);
+        } catch (InterruptedException | ExecutionException | TimeoutException e) {
+            // Expected the thread to be parked
+        }
+        assertFalse(result, "The thread should be parked");
+    }
+}

core-java-modules/core-java-sun/src/test/java/com/baeldung/park/ThreadInterruptedBehaviorUnitTest.java

@@ -0,0 +1,56 @@
+package com.baeldung.park;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.LockSupport;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
+
+class ThreadInterruptedBehaviorUnitTest {
+
+    @Test
+    @Timeout(3)
+    void givenParkedThreadWhenInterruptedShouldNotResetInterruptedFlag() throws InterruptedException {
+        final Thread thread = new Thread(LockSupport::park);
+        thread.start();
+        thread.interrupt();
+        assertTrue(thread.isInterrupted(), "The thread should have the interrupted flag");
+        thread.join();
+    }
+
+    @Test
+    @Timeout(3)
+    void givenParkedThreadWhenNotInterruptedShouldNotHaveInterruptedFlag() throws InterruptedException {
+        final Thread thread = new Thread(LockSupport::park);
+        thread.start();
+        Thread.sleep(TimeUnit.SECONDS.toMillis(1));
+        LockSupport.unpark(thread);
+        assertFalse(thread.isInterrupted(), "The thread shouldn't have the interrupted flag");
+        thread.join();
+    }
+
+    @Test
+    @Timeout(3)
+    void givenWaitingThreadWhenNotInterruptedShouldNotHaveInterruptedFlag() throws InterruptedException {
+
+        final Thread thread = new Thread() {
+            @Override
+            public void run() {
+                synchronized (this) {
+                    try {
+                        this.wait();
+                    } catch (InterruptedException e) {
+                        // The thread was interrupted
+                    }
+                }
+            }
+        };
+
+        thread.start();
+        Thread.sleep(TimeUnit.SECONDS.toMillis(1));
+        thread.interrupt();
+        thread.join();
+        assertFalse(thread.isInterrupted(), "The thread shouldn't have the interrupted flag");
+    }
+}

core-java-modules/core-java-sun/src/test/java/com/baeldung/park/TreadMonitorsBehaviorUnitTest.java

@@ -0,0 +1,51 @@
+package com.baeldung.park;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTimeoutPreemptively;
+
+import java.time.Duration;
+import java.time.temporal.ChronoUnit;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.LockSupport;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.Timeout;
+
+
+class TreadMonitorsBehaviorUnitTest {
+
+    @Test
+    @Timeout(3)
+    void giveThreadWhenNotifyWithoutAcquiringMonitorThrowsException() {
+        final Thread thread = new Thread() {
+            @Override
+            public void run() {
+                synchronized (this) {
+                    try {
+                        this.wait();
+                    } catch (InterruptedException e) {
+                        // The thread was interrupted
+                    }
+                }
+            }
+        };
+
+        assertThrows(IllegalMonitorStateException.class, () -> {
+            thread.start();
+            Thread.sleep(TimeUnit.SECONDS.toMillis(1));
+            thread.notify();
+            thread.join();
+        });
+    }
+
+    @Test
+    @Timeout(3)
+    void giveThreadWhenUnparkWithoutAcquiringMonitor() {
+        final Thread thread = new Thread(LockSupport::park);
+        assertTimeoutPreemptively(Duration.of(2, ChronoUnit.SECONDS), () -> {
+            thread.start();
+            LockSupport.unpark(thread);
+        });
+    }
+}

core-java-modules/pom.xml

@@ -21,7 +21,9 @@
         <!--<module>core-java-8-2</module> -->
         <!--<module>core-java-8-datetime</module> -->
         <!--<module>core-java-8-datetime-2</module> -->
-        <!--<module>core-java-collections-conversions-2</module> -->
+        <module>core-java-collections-conversions-2</module>
+        <module>core-java-collections-conversions-3</module>
+        <module>core-java-concurrency-advanced-5</module>
         <!--<module>core-java-lang</module> -->
         <!--<module>core-java-lang-math-3</module> -->
         <!--<module>core-java-security</module> -->
@@ -32,6 +34,7 @@
         <!-- <module>core-java-modules/core-java-16</module> --> <!-- JAVA-26056 -->
         <!-- <module>core-java-modules/core-java-17</module> --> <!-- JAVA-26056 -->
         <!-- <module>core-java-modules/core-java-19</module> --> <!-- JAVA-26056 -->
+        <module>core-java-numbers-conversions</module>
         <module>core-java-9-improvements</module>
         <module>core-java-9-streams</module>
         <module>core-java-9</module>
@@ -195,9 +198,10 @@
         <module>core-java-records</module>
         <module>core-java-9-jigsaw</module>
         <!--<module>core-java-20</module>--> <!--JAVA-25373-->
+        <!--<module>core-java-conditionals</module>--> <!--JAVA-25373-->
         <module>core-java-collections-set</module>
         <module>core-java-date-operations-1</module>
-        <!--<module>core-java-datetime-conversion</module>--> <!--JAVA-25433-->
+        <module>core-java-datetime-conversion</module>
         <module>core-java-httpclient</module>
         <module>java-native</module>
     </modules>

di-modules/avaje/pom.xml

@@ -3,14 +3,11 @@
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.baeldung</groupId>
-    <artifactId>inject-intro</artifactId>
+    <artifactId>avaje</artifactId>
     <version>0.0.1-SNAPSHOT</version>
-    <name>avaje-inject-intro</name>
+    <name>avaje</name>
-    <properties>
+    <description>Avaje Inject Intro</description>
-        <maven.compiler.source>11</maven.compiler.source>
+
-        <maven.compiler.target>11</maven.compiler.target>
-        <avaje.inject.version>9.5</avaje.inject.version>
-    </properties>
     <dependencies>
         <dependency>
             <groupId>io.avaje</groupId>
@@ -34,4 +31,10 @@
             <optional>true</optional>
         </dependency>
     </dependencies>
+
+    <properties>
+        <maven.compiler.source>11</maven.compiler.source>
+        <maven.compiler.target>11</maven.compiler.target>
+        <avaje.inject.version>9.5</avaje.inject.version>
+    </properties>
 </project>

di-modules/pom.xml

@@ -18,6 +18,7 @@
         <module>dagger</module>
         <module>flyway-cdi-extension</module>
         <module>guice</module>
+        <module>avaje</module>
     </modules>
 
 </project>

ethereum/pom.xml

@@ -192,7 +192,7 @@
         <ethereumj-core.version>1.5.0-RELEASE</ethereumj-core.version>
         <web3j.core.version>3.3.1</web3j.core.version>
         <spring.boot.version>1.5.6.RELEASE</spring.boot.version>
-        <jsonpath.version>2.4.0</jsonpath.version>
+        <jsonpath.version>2.8.0</jsonpath.version>
         <spring-boot-maven-plugin.version>2.0.4.RELEASE</spring-boot-maven-plugin.version>
         <compiler.plugin.version>3.1</compiler.plugin.version>
     </properties>

google-auto-project/pom.xml

@@ -8,7 +8,6 @@
     <name>google-auto-project</name>
     <packaging>pom</packaging>
 
-
     <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>parent-modules</artifactId>

jackson-modules/jackson-annotations/pom.xml

@@ -21,7 +21,7 @@
         <dependency>
             <groupId>io.rest-assured</groupId>
             <artifactId>json-path</artifactId>
-            <version>${rest-assured.version}</version>
+            <version>${json-path.version}</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -59,7 +59,7 @@
 
     <properties>
         <h2.version>2.1.214</h2.version>
-        <rest-assured.version>3.1.1</rest-assured.version>
+        <json-path.version>5.3.2</json-path.version>
         <spring-boot.version>2.5.0</spring-boot.version>
     </properties>
 

java-websocket/pom.xml

@@ -29,7 +29,7 @@
 
     <properties>
         <javax.websocket-api.version>1.1</javax.websocket-api.version>
-        <gson.version>2.8.0</gson.version>
+        <gson.version>2.10.1</gson.version>
     </properties>
 
 </project>

javaxval/pom.xml

@@ -37,7 +37,7 @@
     <!--</plugin> </plugins> </build> -->
 
     <properties>
-        <hibernate-validator.ap.version>6.2.0.Final</hibernate-validator.ap.version>
+        <hibernate-validator.ap.version>8.0.1.Final</hibernate-validator.ap.version>
         <spring.boot.version>3.0.4</spring.boot.version>
     </properties>
 

jersey/README.md

@@ -12,3 +12,4 @@ This module contains articles about Jersey.
 - [Add a Header to a Jersey SSE Client Request](https://www.baeldung.com/jersey-sse-client-request-headers)
 - [Exception Handling With Jersey](https://www.baeldung.com/java-exception-handling-jersey)
 - [@FormDataParam vs. @FormParam in Jersey](https://www.baeldung.com/jersey-formdataparam-vs-formparam)
+- [Add a List as Query Parameter in Jersey](https://www.baeldung.com/java-jersey-list-query-param)

json-modules/gson/pom.xml

@@ -64,8 +64,8 @@
     </build>
 
     <properties>
-        <gson.version>2.8.0</gson.version>
+        <gson.version>2.10.1</gson.version>
-        <joda-time.version>2.9.6</joda-time.version>
+        <joda-time.version>2.12.5</joda-time.version>
     </properties>
 
 </project>

json-modules/gson/src/test/java/com/baeldung/gson/conversion/JsonObjectConversionsUnitTest.java

@@ -1,6 +1,10 @@
 package com.baeldung.gson.conversion;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
 import com.google.gson.*;
+
 import org.junit.Assert;
 import org.junit.jupiter.api.Test;
 
@@ -10,24 +14,29 @@ public class JsonObjectConversionsUnitTest {
     void whenUsingJsonParser_thenConvertToJsonObject() throws Exception {
         // Example 1: Using JsonParser
         String json = "{ \"name\": \"Baeldung\", \"java\": true }";
-        
+
-        JsonObject jsonObject = new JsonParser().parse(json).getAsJsonObject();
+        JsonObject jsonObject = JsonParser.parseString(json)
-        
+            .getAsJsonObject();
-        Assert.assertTrue(jsonObject.isJsonObject());
+
-        Assert.assertTrue(jsonObject.get("name").getAsString().equals("Baeldung"));
+        assertTrue(jsonObject.isJsonObject());
-        Assert.assertTrue(jsonObject.get("java").getAsBoolean() == true);
+        assertEquals("Baeldung", jsonObject.get("name")
+            .getAsString());
+        assertTrue(jsonObject.get("java")
+            .getAsBoolean());
     }
 
     @Test
     void whenUsingGsonInstanceFromJson_thenConvertToJsonObject() throws Exception {
         // Example 2: Using fromJson
         String json = "{ \"name\": \"Baeldung\", \"java\": true }";
-        
+
         JsonObject convertedObject = new Gson().fromJson(json, JsonObject.class);
-        
+
-        Assert.assertTrue(convertedObject.isJsonObject());
+        assertTrue(convertedObject.isJsonObject());
-        Assert.assertTrue(convertedObject.get("name").getAsString().equals("Baeldung"));
+        assertEquals("Baeldung", convertedObject.get("name")
-        Assert.assertTrue(convertedObject.get("java").getAsBoolean() == true);
+            .getAsString());
+        assertTrue(convertedObject.get("java")
+            .getAsBoolean());
     }
 
 }

json-modules/gson/src/test/java/com/baeldung/gson/deserialization/test/GsonDeserializationUnitTest.java

@@ -3,8 +3,9 @@ package com.baeldung.gson.deserialization.test;
 import static org.hamcrest.Matchers.hasItem;
 import static org.hamcrest.Matchers.instanceOf;
 import static org.hamcrest.Matchers.not;
+import static org.hamcrest.MatcherAssert.assertThat;
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertThat;
+
 
 import java.lang.reflect.Type;
 import java.util.ArrayList;
@@ -68,7 +69,7 @@ public class GsonDeserializationUnitTest {
 
         final GenericFoo<Integer> targetObject = new Gson().fromJson(json, typeToken);
 
-        assertEquals(targetObject.theValue, new Integer(1));
+        assertEquals(targetObject.theValue, Integer.valueOf(1));
     }
 
     // tests - multiple elements
@@ -98,8 +99,7 @@ public class GsonDeserializationUnitTest {
     @Test
     public void whenDeserializingJsonIntoElements_thenCorrect() {
         final String jsonSourceObject = "{\"valueInt\":7,\"valueString\":\"seven\"}";
-        final JsonParser jParser = new JsonParser();
+        final JsonElement jElement = JsonParser.parseString(jsonSourceObject);
-        final JsonElement jElement = jParser.parse(jsonSourceObject);
         final JsonObject jObject = jElement.getAsJsonObject();
         final int intValue = jObject.get("valueInt").getAsInt();
         final String stringValue = jObject.get("valueString").getAsString();

json-modules/gson/src/test/java/com/baeldung/gson/jsoncompare/JsonCompareUnitTest.java

@@ -16,79 +16,71 @@ public class JsonCompareUnitTest {
 
     @Test
     public void givenIdenticalSimpleObjects_whenCompared_thenEqual() {
-        JsonParser parser = new JsonParser();
         String string1 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27 }}";
         String string2 = "{\"customer\": {\"id\": \"44521\", \"fullName\": \"Emily Jenkins\",\"age\": 27}}";
 
-        assertTrue(parser.parse(string1)
+        assertTrue(JsonParser.parseString(string1).isJsonObject());
-            .isJsonObject());
+        assertEquals(JsonParser.parseString(string1), JsonParser.parseString(string2));
-        assertEquals(parser.parse(string1), parser.parse(string2));
     }
 
     @Test
     public void givenSameObjectsInDifferentOrder_whenCompared_thenEqual() {
-        JsonParser parser = new JsonParser();
         String string1 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27 }}";
         String string2 = "{\"customer\": {\"id\": \"44521\",\"age\": 27, \"fullName\": \"Emily Jenkins\" }}";
 
-        JsonElement json1 = parser.parse(string1);
+        JsonElement json1 = JsonParser.parseString(string1);
-        JsonElement json2 = parser.parse(string2);
+        JsonElement json2 = JsonParser.parseString(string2);
 
         assertEquals(json1, json2);
     }
 
     @Test
     public void givenIdenticalArrays_whenCompared_thenEqual() {
-        JsonParser parser = new JsonParser();
         String string1 = "[10, 20, 30]";
         String string2 = "[10, 20, 30]";
 
-        assertTrue(parser.parse(string1)
+        assertTrue(JsonParser.parseString(string1)
             .isJsonArray());
-        assertEquals(parser.parse(string1), parser.parse(string2));
+        assertEquals(JsonParser.parseString(string1), JsonParser.parseString(string2));
     }
 
     @Test
     public void givenArraysInDifferentOrder_whenCompared_thenNotEqual() {
-        JsonParser parser = new JsonParser();
         String string1 = "[20, 10, 30]";
         String string2 = "[10, 20, 30]";
 
-        assertNotEquals(parser.parse(string1), parser.parse(string2));
+        assertNotEquals(JsonParser.parseString(string1), JsonParser.parseString(string2));
     }
 
     @Test
     public void givenIdenticalNestedObjects_whenCompared_thenEqual() {
-        JsonParser parser = new JsonParser();
         String string1 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"fav_product\": \"Coke\", \"last_buy\": \"2012-04-23\"}}}";
         String string2 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"last_buy\": \"2012-04-23\", \"fav_product\": \"Coke\"}}}";
 
-        JsonElement json1 = parser.parse(string1);
+        JsonElement json1 = JsonParser.parseString(string1);
-        JsonElement json2 = parser.parse(string2);
+        JsonElement json2 = JsonParser.parseString(string2);
 
         assertEquals(json1, json2);
     }
 
     @Test
     public void givenIdenticalNestedObjectsWithArray_whenCompared_thenEqual() {
-        JsonParser parser = new JsonParser();
         String string1 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"last_buy\": \"2012-04-23\", \"prouducts\": [\"banana\", \"eggs\"]}}}";
         String string2 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"last_buy\": \"2012-04-23\", \"prouducts\": [\"banana\", \"eggs\"]}}}";
 
-        JsonElement json1 = parser.parse(string1);
+        JsonElement json1 = JsonParser.parseString(string1);
-        JsonElement json2 = parser.parse(string2);
+        JsonElement json2 = JsonParser.parseString(string2);
 
         assertEquals(json1, json2);
     }
 
     @Test
     public void givenNestedObjectsDifferentArrayOrder_whenCompared_thenNotEqual() {
-        JsonParser parser = new JsonParser();
         String string1 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"last_buy\": \"2012-04-23\", \"prouducts\": [\"banana\", \"eggs\"]}}}";
         String string2 = "{\"customer\": {\"id\": \"44521\",\"fullName\": \"Emily Jenkins\", \"age\": 27, \"consumption_info\" : {\"last_buy\": \"2012-04-23\", \"prouducts\": [\"eggs\", \"banana\"]}}}";
 
-        JsonElement json1 = parser.parse(string1);
+        JsonElement json1 = JsonParser.parseString(string1);
-        JsonElement json2 = parser.parse(string2);
+        JsonElement json2 = JsonParser.parseString(string2);
 
         assertNotEquals(json1, json2);
     }

json-modules/gson/src/test/java/com/baeldung/gson/primitives/PrimitiveValuesUnitTest.java

@@ -43,8 +43,8 @@ public class PrimitiveValuesUnitTest {
         gson.toJson(model);
     }
 
-    @Test(expected = IllegalArgumentException.class) public void
+    @Test(expected = IllegalArgumentException.class)
-        whenSerializingNaN_thenShouldRaiseAnException() {
+    public void whenSerializingNaN_thenShouldRaiseAnException() {
         FloatExample model = new FloatExample();
         model.value = Float.NaN;
 
@@ -52,7 +52,8 @@ public class PrimitiveValuesUnitTest {
         gson.toJson(model);
     }
 
-    @Test public void whenDeserializingFromJSON_thenShouldParseTheValueInTheString() {
+    @Test
+    public void whenDeserializingFromJSON_thenShouldParseTheValueInTheString() {
         String json = "{\"byteValue\": 17, \"shortValue\": 3, \"intValue\": 3, "
             + "\"longValue\": 3, \"floatValue\": 3.5" + ", \"doubleValue\": 3.5"
             + ", \"booleanValue\": true, \"charValue\": \"a\"}";
@@ -72,14 +73,16 @@ public class PrimitiveValuesUnitTest {
         // @formatter:on
     }
 
-    @Test public void whenDeserializingHighPrecissionNumberIntoFloat_thenShouldPerformRounding() {
+    @Test
+    public void whenDeserializingHighPrecissionNumberIntoFloat_thenShouldPerformRounding() {
         String json = "{\"value\": 12.123425589123456}";
         Gson gson = new Gson();
         FloatExample model = gson.fromJson(json, FloatExample.class);
         assertEquals(12.123426f, model.value, 0.000001);
     }
 
-    @Test public void whenDeserializingHighPrecissiongNumberIntoDouble_thenShouldPerformRounding() {
+    @Test
+    public void whenDeserializingHighPrecissiongNumberIntoDouble_thenShouldPerformRounding() {
         String json = "{\"value\": 12.123425589123556}";
         Gson gson = new Gson();
         DoubleExample model = gson.fromJson(json, DoubleExample.class);
@@ -87,12 +90,12 @@ public class PrimitiveValuesUnitTest {
     }
 
 
-    @Test public void whenDeserializingValueThatOverflows_thenShouldOverflowSilently() {
+    @Test(expected = JsonSyntaxException.class)
+    public void whenDeserializingValueThatOverflows_thenShouldRaiseAnException() {
         Gson gson = new Gson();
         String json = "{\"value\": \"300\"}";
         ByteExample model = gson.fromJson(json, ByteExample.class);
 
-        assertEquals(44, model.value);
     }
 
     @Test public void whenDeserializingRealIntoByte_thenShouldRaiseAnException() {

json-modules/gson/src/test/java/com/baeldung/gson/serialization/GsonSerializeUnitTest.java

@@ -41,8 +41,7 @@ public class GsonSerializeUnitTest {
           .serializeNulls()
           .disableHtmlEscaping()
           .create()
-          .toJson(new JsonParser()
+          .toJson(JsonParser.parseString("{\"imdbId\":null,\"actors\":[{\"<strong>IMDB Code</strong>\":\"nm2199632\",\"<strong>Date Of Birth</strong>\":\"21-09-1982\",\"<strong>N° Film:</strong> \":3,\"filmography\":\"Apocalypto-Beatdown-Wind Walkers\"}]}"));
-            .parse("{\"imdbId\":null,\"actors\":[{\"<strong>IMDB Code</strong>\":\"nm2199632\",\"<strong>Date Of Birth</strong>\":\"21-09-1982\",\"<strong>N° Film:</strong> \":3,\"filmography\":\"Apocalypto-Beatdown-Wind Walkers\"}]}"));
         Assert.assertEquals(gson.toJson(movieWithNullValue), expectedOutput);
     }
 }

json-modules/json-2/pom.xml

@@ -1,7 +1,7 @@
 <?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"
+    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">
+    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>json-2</artifactId>
     <version>0.0.1-SNAPSHOT</version>

json-modules/json-arrays/pom.xml

@@ -38,7 +38,7 @@
 
     <properties>
         <jsonb-api.version>1.0</jsonb-api.version>
-        <gson.version>2.8.5</gson.version>
+        <gson.version>2.10.1</gson.version>
         <javax.version>1.1.2</javax.version>
         <json-unit-assertj.version>2.28.0</json-unit-assertj.version>
     </properties>

json-modules/json-path/pom.xml

@@ -13,7 +13,6 @@
     </parent>
 
     <dependencies>
-        <!-- json-path -->
         <dependency>
             <groupId>com.jayway.jsonpath</groupId>
             <artifactId>json-path</artifactId>
@@ -22,8 +21,7 @@
     </dependencies>
 
     <properties>
-        <!-- json-path -->
+        <json-path.version>2.8.0</json-path.version>
-        <json-path.version>2.4.0</json-path.version>
     </properties>
 
 </project>

json-modules/json/pom.xml

@@ -68,7 +68,7 @@
         <networknt.json.schema.version>1.0.72</networknt.json.schema.version>
         <jsonb-api.version>1.0</jsonb-api.version>
         <yasson.version>1.0.1</yasson.version>
-        <gson.version>2.8.5</gson.version>
+        <gson.version>2.10.1</gson.version>
         <javax.version>1.1.2</javax.version>
         <json-unit-assertj.version>2.28.0</json-unit-assertj.version>
     </properties>

libraries-5/pom.xml

@@ -141,7 +141,7 @@
         <typesafe-akka.version>2.5.11</typesafe-akka.version>
         <streamex.version>0.8.1</streamex.version>
         <docker.version>3.0.14</docker.version>
-        <caffeine.version>2.5.5</caffeine.version>
+        <caffeine.version>3.1.8</caffeine.version>
         <findbugs.version>3.0.2</findbugs.version>
         <fugue.version>4.5.1</fugue.version>
         <jnats.version>1.0</jnats.version>

libraries-6/pom.xml

@@ -108,7 +108,7 @@
         <dependency>
             <groupId>org.agrona</groupId>
             <artifactId>agrona</artifactId>
-            <version>1.17.1</version>
+            <version>${agrona.version}</version>
         </dependency>
     </dependencies>
 
@@ -126,7 +126,7 @@
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
-                <version>1.6.0</version>
+                <version>${exec-maven-plugin.version}</version>
                 <executions>
                     <execution>
                         <phase>generate-sources</phase>
@@ -154,14 +154,14 @@
                     <dependency>
                         <groupId>uk.co.real-logic</groupId>
                         <artifactId>sbe-tool</artifactId>
-                        <version>1.27.0</version>
+                        <version>${sbe-tool.version}</version>
                     </dependency>
                 </dependencies>
             </plugin>
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>build-helper-maven-plugin</artifactId>
-                <version>3.0.0</version>
+                <version>${build-helper-maven-plugin.version}</version>
                 <executions>
                     <execution>
                         <id>add-source</id>
@@ -204,7 +204,11 @@
         <rcaller.version>3.0</rcaller.version>
         <rserve.version>1.8.1</rserve.version>
         <libphonenumber.version>8.12.9</libphonenumber.version>
-        <org.modelmapper.version>2.4.4</org.modelmapper.version>
+        <org.modelmapper.version>3.2.0</org.modelmapper.version>
+        <agrona.version>1.17.1</agrona.version>
+        <exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
+        <sbe-tool.version>1.27.0</sbe-tool.version>
+        <build-helper-maven-plugin.version>3.0.0</build-helper-maven-plugin.version>
     </properties>
 
 </project>

libraries-data-io/pom.xml

@@ -106,7 +106,7 @@
         <google-sheets.version>v4-rev493-1.21.0</google-sheets.version>
         <docx4j.version>6.1.2</docx4j.version>
         <jaxb-runtime.version>2.3.1</jaxb-runtime.version>
-        <gson.version>2.8.7</gson.version>
+        <gson.version>2.10.1</gson.version>
         <yamlbeans.version>1.15</yamlbeans.version>
         <apache-thrift.version>0.14.2</apache-thrift.version>
         <google-protobuf.version>3.17.3</google-protobuf.version>

libraries-data/pom.xml

@@ -210,7 +210,7 @@
         <kafka.version>3.3.1</kafka.version>
         <ignite.version>2.14.0</ignite.version>
         <ignite-spring-data.version>2.9.1</ignite-spring-data.version>
-        <gson.version>2.9.1</gson.version>
+        <gson.version>2.10.1</gson.version>
         <cache.version>1.1.1</cache.version>
         <flink.version>1.5.0</flink.version>
         <hazelcast.version>5.2.0</hazelcast.version>

libraries-http-2/pom.xml

@@ -110,7 +110,7 @@
 
     <properties>
         <okhttp.version>4.9.1</okhttp.version>
-        <gson.version>2.8.5</gson.version>
+        <gson.version>2.10.1</gson.version>
         <mockwebserver.version>4.9.1</mockwebserver.version>
         <jetty.httpclient.version>1.0.3</jetty.httpclient.version>
         <jetty.server.version>9.4.19.v20190610</jetty.server.version>

libraries-http/pom.xml

@@ -103,7 +103,7 @@
     </dependencies>
 
     <properties>
-        <gson.version>2.8.5</gson.version>
+        <gson.version>2.10.1</gson.version>
         <httpclient.version>4.5.3</httpclient.version>
         <com.squareup.okhttp3.version>4.9.1</com.squareup.okhttp3.version>
         <googleclient.version>1.23.0</googleclient.version>

libraries-io/pom.xml

@@ -56,7 +56,7 @@
     <properties>
         <!-- sftp -->
         <jsch.version>0.1.55</jsch.version>
-        <sshj.version>0.27.0</sshj.version>
+        <sshj.version>0.37.0</sshj.version>
         <vfs.version>2.4</vfs.version>
         <zip4j.version>2.9.0</zip4j.version>
         <opencsv.version>5.8</opencsv.version>

libraries-io/src/test/java/com/baeldung/java/io/remote/SftpFileTransferLiveTest.java

@@ -20,14 +20,14 @@ import net.schmizz.sshj.transport.verification.PromiscuousVerifier;
 
 public class SftpFileTransferLiveTest {
 
-    private String remoteHost = "HOST_NAME_HERE";
+    private final String remoteHost = "HOST_NAME_HERE";
-    private String username = "USERNAME_HERE";
+    private final String username = "USERNAME_HERE";
-    private String password = "PASSWORD_HERE";
+    private final String password = "PASSWORD_HERE";
-    private String localFile = "src/main/resources/input.txt";
+    private final String localFile = "src/main/resources/input.txt";
-    private String remoteFile = "welcome.txt";
+    private final String remoteFile = "welcome.txt";
-    private String localDir = "src/main/resources/";
+    private final String localDir = "src/main/resources/";
-    private String remoteDir = "remote_sftp_test/";
+    private final String remoteDir = "remote_sftp_test/";
-    private String knownHostsFileLoc = "/Users/USERNAME/known_hosts_sample";
+    private final String knownHostsFileLoc = "/Users/USERNAME/known_hosts_sample";
 
     @Test
     public void whenUploadFileUsingJsch_thenSuccess() throws JSchException, SftpException {
@@ -100,6 +100,7 @@ public class SftpFileTransferLiveTest {
         client.addHostKeyVerifier(new PromiscuousVerifier());
         client.connect(remoteHost);
         client.authPassword(username, password);
+        client.useCompression();
         return client;
     }