Merge pull request #58 from eugenp/master

update

algorithms-sorting-2/src/main/java/com/baeldung/algorithms/quicksort/DutchNationalFlagPartioning.java

@@ -5,21 +5,21 @@ import static com.baeldung.algorithms.quicksort.SortingUtils.swap;
 
 public class DutchNationalFlagPartioning {
 
-    public static Partition partition(int[] a, int begin, int end) {
+    public static Partition partition(int[] input, int begin, int end) {
         int lt = begin, current = begin, gt = end;
-        int partitioningValue = a[begin];
+        int partitioningValue = input[begin];
 
         while (current <= gt) {
-            int compareCurrent = compare(a[current], partitioningValue);
+            int compareCurrent = compare(input[current], partitioningValue);
             switch (compareCurrent) {
                 case -1:
-                    swap(a, current++, lt++);
+                    swap(input, current++, lt++);
                     break;
                 case 0:
                     current++;
                     break;
                 case 1:
-                    swap(a, current, gt--);
+                    swap(input, current, gt--);
                     break;
             }
         }

core-java-modules/core-java-14/README.md

@@ -9,3 +9,4 @@ This module contains articles about Java 14.
 - [Pattern Matching for instanceof in Java 14](https://www.baeldung.com/java-pattern-matching-instanceof)
 - [Helpful NullPointerExceptions in Java 14](https://www.baeldung.com/java-14-nullpointerexception)
 - [Foreign Memory Access API in Java 14](https://www.baeldung.com/java-foreign-memory-access)
+- [Java 14 Record Keyword](https://www.baeldung.com/java-record-keyword)

core-java-modules/core-java-9-improvements/README.md

@@ -5,7 +5,7 @@ This module contains articles about the improvements to core Java features intro
 ### Relevant Articles:
 
 - [New Stream Collectors in Java 9](http://www.baeldung.com/java9-stream-collectors)
-- [Java 9 Convenience Factory Methods for Collections](https://www.baeldung.com/java-9-collections-factory-methods)
+- [Java Convenience Factory Methods for Collections](https://www.baeldung.com/java-9-collections-factory-methods)
 - [Java 9 Stream API Improvements](https://www.baeldung.com/java-9-stream-api)
 - [Java 9 java.util.Objects Additions](https://www.baeldung.com/java-9-objects-new)
 - [Java 9 CompletableFuture API Improvements](https://www.baeldung.com/java-9-completablefuture)

core-java-modules/core-java-concurrency-advanced-3/README.md

@@ -13,4 +13,5 @@ This module contains articles about advanced topics about multithreading with co
 - [Java Thread Deadlock and Livelock](https://www.baeldung.com/java-deadlock-livelock)
 - [Guide to AtomicStampedReference in Java](https://www.baeldung.com/java-atomicstampedreference)
 - [The ABA Problem in Concurrency](https://www.baeldung.com/cs/aba-concurrency)
+- [Introduction to Lock-Free Data Structures](https://www.baeldung.com/lock-free-programming)
 - [[<-- previous]](/core-java-modules/core-java-concurrency-advanced-2)

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

@@ -13,3 +13,4 @@ This module contains articles about concurrent Java collections
 - [Guide to the Java TransferQueue](http://www.baeldung.com/java-transfer-queue)
 - [Guide to the ConcurrentSkipListMap](http://www.baeldung.com/java-concurrent-skip-list-map)
 - [Guide to CopyOnWriteArrayList](http://www.baeldung.com/java-copy-on-write-arraylist)
+- [LinkedBlockingQueue vs ConcurrentLinkedQueue](https://www.baeldung.com/java-queue-linkedblocking-concurrentlinked)

core-java-modules/core-java-exceptions-2/src/test/java/com/baeldung/exceptions/TooManyOpenFilesExceptionLiveTest.java

@@ -0,0 +1,82 @@
+package com.baeldung.exceptions;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertFalse;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.AfterEach;
+
+
+public class TooManyOpenFilesExceptionLiveTest {
+
+    private File tempFile;
+
+    @BeforeEach
+    public void setUp() throws IOException {
+        tempFile = File.createTempFile("testForException", "tmp");
+    }
+
+    @AfterEach
+    public void tearDown() {
+        System.gc();
+        tempFile.delete();
+    }
+
+    @Test
+    public void whenNotClosingResoures_thenIOExceptionShouldBeThrown() {
+        try {
+            for (int x = 0; x < 1000000; x++) {
+                FileInputStream leakyHandle = new FileInputStream(tempFile);
+            }
+            Assertions.fail("Method Should Have Failed");
+        } catch (IOException e) {
+            assertTrue(e.getMessage().toLowerCase().contains("too many open files"));
+        } catch (Exception e) {
+            Assertions.fail("Unexpected exception");
+        }
+    }
+
+    @Test
+    public void whenClosingResoures_thenIOExceptionShouldNotBeThrown() {
+        try {
+            for (int x = 0; x < 1000000; x++) {
+                FileInputStream nonLeakyHandle = null;
+                try {
+                    nonLeakyHandle = new FileInputStream(tempFile);
+                } finally {
+                    if (nonLeakyHandle != null) {
+                        nonLeakyHandle.close();
+                    }
+                }
+            }
+        } catch (IOException e) {
+            assertFalse(e.getMessage().toLowerCase().contains("too many open files"));
+            Assertions.fail("Method Should Not Have Failed");
+        } catch (Exception e) {
+            Assertions.fail("Unexpected exception");
+        }
+    }
+
+    @Test
+    public void whenUsingTryWithResoures_thenIOExceptionShouldNotBeThrown() {
+        try {
+            for (int x = 0; x < 1000000; x++) {
+                try (FileInputStream nonLeakyHandle = new FileInputStream(tempFile)) {
+                    //Do something with the file
+                }
+            }
+        } catch (IOException e) {
+            assertFalse(e.getMessage().toLowerCase().contains("too many open files"));
+            Assertions.fail("Method Should Not Have Failed");
+        } catch (Exception e) {
+            Assertions.fail("Unexpected exception");
+        }
+    }
+}

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

@@ -51,14 +51,31 @@
             <scope>system</scope>
             <systemPath>${java.home}/../lib/tools.jar</systemPath>
         </dependency>
+        <dependency>
+            <groupId>org.ow2.asm</groupId>
+            <artifactId>asm</artifactId>
+            <version>${asm.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.ow2.asm</groupId>
+            <artifactId>asm-util</artifactId>
+            <version>${asm.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.bcel</groupId>
+            <artifactId>bcel</artifactId>
+            <version>${bcel.version}</version>
+        </dependency>    
     </dependencies>
 
     <properties>
         <assertj.version>3.6.1</assertj.version>
         <!-- instrumentation -->
-        <javaassist.version>3.21.0-GA</javaassist.version>
+        <javaassist.version>3.27.0-GA</javaassist.version>
         <esapi.version>2.1.0.1</esapi.version>
         <sun.tools.version>1.8.0</sun.tools.version>
+        <asm.version>8.0.1</asm.version>
+        <bcel.version>6.5.0</bcel.version>
     </properties>
 
 </project>

core-java-modules/core-java-jvm/src/test/java/com/baeldung/bytecode/ViewBytecodeUnitTest.java

@@ -0,0 +1,51 @@
+package com.baeldung.bytecode;
+
+import static org.junit.Assert.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+
+import org.apache.bcel.Repository;
+import org.apache.bcel.classfile.JavaClass;
+import org.junit.Test;
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.util.TraceClassVisitor;
+import javassist.ClassPool;
+import javassist.NotFoundException;
+import javassist.bytecode.ClassFile;
+
+public class ViewBytecodeUnitTest {
+    
+    @Test
+    public void whenUsingASM_thenReadBytecode() throws IOException {
+        ClassReader reader = new ClassReader("java.lang.Object");
+        StringWriter sw = new StringWriter();
+        TraceClassVisitor tcv = new TraceClassVisitor(new PrintWriter(sw));
+        reader.accept(tcv, 0); 
+        
+        assertTrue(sw.toString().contains("public class java/lang/Object")); 
+    }
+    
+    @Test
+    public void whenUsingBCEL_thenReadBytecode() throws ClassNotFoundException {
+        JavaClass objectClazz = Repository.lookupClass("java.lang.Object");
+        
+        assertEquals(objectClazz.getClassName(), "java.lang.Object");   
+        assertEquals(objectClazz.getMethods().length, 14);
+        assertTrue(objectClazz.toString().contains("public class java.lang.Object"));
+    }
+    
+    @Test
+    public void whenUsingJavassist_thenReadBytecode() throws NotFoundException {
+        ClassPool cp = ClassPool.getDefault();
+        ClassFile cf = cp.get("java.lang.Object").getClassFile();
+        
+        assertEquals(cf.getName(), "java.lang.Object");
+        assertEquals(cf.getMethods().size(), 14);
+    }
+    
+}
+
+

core-java-modules/core-java-lang-math/README.md

@@ -6,7 +6,6 @@
 - [Java 8 Math New Methods](https://www.baeldung.com/java-8-math)
 - [Java 8 Unsigned Arithmetic Support](https://www.baeldung.com/java-unsigned-arithmetic)
 - [How to Separate Double into Integer and Decimal Parts](https://www.baeldung.com/java-separate-double-into-integer-decimal-parts)
-- [The strictfp Keyword in Java](https://www.baeldung.com/java-strictfp)
 - [Basic Calculator in Java](https://www.baeldung.com/java-basic-calculator)
 - [Overflow and Underflow in Java](https://www.baeldung.com/java-overflow-underflow)
 - [Obtaining a Power Set of a Set in Java](https://www.baeldung.com/java-power-set-of-a-set)

core-java-modules/core-java-lang-operators/README.md

@@ -12,3 +12,4 @@ This module contains articles about Java operators
 - [The XOR Operator in Java](https://www.baeldung.com/java-xor-operator)
 - [Java Bitwise Operators](https://www.baeldung.com/java-bitwise-operators)
 - [Bitwise & vs Logical && Operators](https://www.baeldung.com/java-bitwise-vs-logical-and)
+- [Finding an Object’s Class in Java](https://www.baeldung.com/java-finding-class)

core-java-modules/core-java-string-conversions/src/test/java/com/baeldung/stringtoint/StringToIntOrIntegerUnitTest.java

@@ -17,6 +17,15 @@ public class StringToIntOrIntegerUnitTest {
         assertThat(result).isEqualTo(42);
     }
 
+    @Test
+    public void givenBinaryString_whenParsingInt_shouldConvertToInt() {
+        String givenString = "101010";
+
+        int result = Integer.parseInt(givenString, 2);
+
+        assertThat(result).isEqualTo(42);
+    }
+
     @Test
     public void givenString_whenCallingIntegerValueOf_shouldConvertToInt() {
         String givenString = "42";
@@ -27,6 +36,15 @@ public class StringToIntOrIntegerUnitTest {
     }
 
     @Test
+    public void givenBinaryString_whenCallingIntegerValueOf_shouldConvertToInt() {
+        String givenString = "101010";
+
+        Integer result = Integer.valueOf(givenString, 2);
+
+        assertThat(result).isEqualTo(new Integer(42));
+    }
+  
+    @Test 
     public void givenString_whenCallingValueOf_shouldCacheSomeValues() {
         for (int i = -128; i <= 127; i++) {
             String value = i + "";

core-kotlin-modules/core-kotlin-lang-2/README.md

@@ -11,4 +11,5 @@ This module contains articles about core features in the Kotlin language.
 - [Lazy Initialization in Kotlin](https://www.baeldung.com/kotlin-lazy-initialization)
 - [Comprehensive Guide to Null Safety in Kotlin](https://www.baeldung.com/kotlin-null-safety)
 - [Kotlin Scope Functions](https://www.baeldung.com/kotlin-scope-functions)
+- [Checking Whether a lateinit var Is Initialized in Kotlin](https://www.baeldung.com/kotlin/checking-lateinit)
 - [[<-- Prev]](/core-kotlin-modules/core-kotlin-lang)

drools/README.MD

@@ -5,5 +5,4 @@ This module contains articles about Drools
 ### Relevant Articles:
 
 - [Introduction to Drools](https://www.baeldung.com/drools)
-- [Drools Using Rules from Excel Files](https://www.baeldung.com/drools-excel)
 - [An Example of Backward Chaining in Drools](https://www.baeldung.com/drools-backward-chaining)

guava-collections-map/pom.xml

@@ -16,12 +16,39 @@
 
     <build>
         <finalName>guava-collections-map</finalName>
+
         <resources>
             <resource>
                 <directory>src/main/resources</directory>
                 <filtering>true</filtering>
             </resource>
         </resources>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.22.2</version>
+            </plugin>
+        </plugins>
     </build>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <properties>
+        <junit-jupiter.version>5.6.2</junit-jupiter.version>
+    </properties>
 </project>

guava-collections-set/pom.xml

@@ -13,8 +13,32 @@
         <relativePath>../parent-java</relativePath>
     </parent>
 
+    <build>
+        <finalName>guava-collections-set</finalName>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.22.2</version>
+            </plugin>
+        </plugins>
+    </build>
+
     <dependencies>
         <!-- test scoped -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
@@ -23,13 +47,10 @@
         </dependency>
     </dependencies>
 
-    <build>
-        <finalName>guava-collections-set</finalName>
-    </build>
-
     <properties>
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>
+        <junit-jupiter.version>5.6.2</junit-jupiter.version>
     </properties>
 
 </project>

guava-collections/pom.xml

@@ -15,6 +15,25 @@
         <relativePath>../parent-java</relativePath>
     </parent>
 
+    <build>
+        <finalName>guava-collections</finalName>
+
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.22.2</version>
+            </plugin>
+        </plugins>
+    </build>
+
     <dependencies>
         <!-- utils -->
         <dependency>
@@ -27,7 +46,20 @@
             <artifactId>commons-lang3</artifactId>
             <version>${commons-lang3.version}</version>
         </dependency>
+
         <!-- test scoped -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
@@ -44,16 +76,6 @@
         </dependency>
     </dependencies>
 
-    <build>
-        <finalName>guava-collections</finalName>
-        <resources>
-            <resource>
-                <directory>src/main/resources</directory>
-                <filtering>true</filtering>
-            </resource>
-        </resources>
-    </build>
-
     <properties>
         <!-- util -->
         <commons-collections4.version>4.1</commons-collections4.version>
@@ -61,6 +83,7 @@
         <!-- testing -->
         <assertj.version>3.6.1</assertj.version>
         <java-hamcrest.version>2.0.0.0</java-hamcrest.version>
+        <junit-jupiter.version>5.6.2</junit-jupiter.version>
     </properties>
 
 </project>

guava-io/pom.xml

@@ -4,6 +4,9 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>guava-io</artifactId>
     <version>0.1.0-SNAPSHOT</version>
+    <properties>
+        <junit-jupiter.version>5.6.2</junit-jupiter.version>
+    </properties>
     <name>guava-io</name>
 
     <parent>
@@ -15,12 +18,35 @@
 
     <build>
         <finalName>guava-io</finalName>
+
         <resources>
             <resource>
                 <directory>src/main/resources</directory>
                 <filtering>true</filtering>
             </resource>
         </resources>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.22.2</version>
+            </plugin>
+        </plugins>
     </build>
 
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
 </project>

guava-io/src/test/java/com/baeldung/guava/GuavaIOUnitTest.java

@@ -11,8 +11,11 @@ import java.io.FileOutputStream;
 import java.io.FileReader;
 import java.io.IOException;
 import java.net.URL;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 import java.util.List;
 
+import org.junit.After;
 import org.junit.Test;
 
 import com.google.common.base.Charsets;
@@ -31,6 +34,21 @@ import com.google.common.io.Resources;
 
 public class GuavaIOUnitTest {
 
+    @After
+    public void afterEach() throws Exception {
+        deleteProducedFiles();
+    }
+
+    private void deleteProducedFiles() throws IOException {
+        deleteIfExists("test.out");
+        deleteIfExists("test_copy.in");
+        deleteIfExists("test_le.txt");
+    }
+
+    private void deleteIfExists(String fileName) throws IOException {
+        java.nio.file.Files.deleteIfExists(Paths.get("src", "test", "resources", fileName));
+    }
+
     @Test
     public void whenWriteUsingFiles_thenWritten() throws IOException {
         final String expectedValue = "Hello world";
@@ -206,5 +224,4 @@ public class GuavaIOUnitTest {
 
         assertEquals(value, result);
     }
-
 }

guava-io/src/test/resources/test1.in

@@ -0,0 +1 @@
+Hello world

guava-io/src/test/resources/test1_1.in

@@ -0,0 +1 @@
+Test

guava-io/src/test/resources/test2.in

@@ -0,0 +1,4 @@
+John
+Jane
+Adam
+Tom

guava-modules/guava-18/pom.xml

@@ -8,9 +8,9 @@
 
     <parent>
         <groupId>com.baeldung</groupId>
-        <artifactId>parent-java</artifactId>
+        <artifactId>guava-modules</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../parent-java</relativePath>
+        <relativePath>../</relativePath>
     </parent>
 
     <properties>

guava-modules/guava-19/pom.xml

@@ -8,9 +8,9 @@
 
     <parent>
         <groupId>com.baeldung</groupId>
-        <artifactId>parent-java</artifactId>
+        <artifactId>guava-modules</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../parent-java</relativePath>
+        <relativePath>../</relativePath>
     </parent>
 
     <properties>

guava-modules/guava-21/pom.xml

@@ -8,9 +8,9 @@
 
     <parent>
         <groupId>com.baeldung</groupId>
-        <artifactId>parent-java</artifactId>
+        <artifactId>guava-modules</artifactId>
         <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../parent-java</relativePath>
+        <relativePath>../</relativePath>
     </parent>
 
     <dependencies>

guava-modules/pom.xml

@@ -4,13 +4,16 @@
     <modelVersion>4.0.0</modelVersion>
     <artifactId>guava-modules</artifactId>
     <name>guava-modules</name>
+    <properties>
+        <junit-jupiter.version>5.6.2</junit-jupiter.version>
+    </properties>
     <packaging>pom</packaging>
 
     <parent>
         <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
-        <relativePath>..</relativePath>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
     </parent>
 
     <modules>
@@ -19,4 +22,28 @@
         <module>guava-21</module>
     </modules>
 
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.22.2</version>
+            </plugin>
+        </plugins>
+    </build>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
 </project>

guava/pom.xml

@@ -15,13 +15,45 @@
         <relativePath>../parent-java</relativePath>
     </parent>
 
+    <build>
+        <finalName>guava</finalName>
+
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.22.2</version>
+            </plugin>
+        </plugins>
+    </build>
+
     <dependencies>
         <dependency>
             <groupId>org.apache.commons</groupId>
             <artifactId>commons-lang3</artifactId>
             <version>${commons-lang3.version}</version>
         </dependency>
+
         <!-- test scoped -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
@@ -30,18 +62,9 @@
         </dependency>
     </dependencies>
 
-    <build>
-        <finalName>guava</finalName>
-        <resources>
-            <resource>
-                <directory>src/main/resources</directory>
-                <filtering>true</filtering>
-            </resource>
-        </resources>
-    </build>
-
     <properties>
         <!-- testing -->
+        <junit-jupiter.version>5.6.2</junit-jupiter.version>
         <assertj.version>3.6.1</assertj.version>
     </properties>
 

jackson-modules/pom.xml

@@ -23,6 +23,16 @@
         <module>jackson-exceptions</module>
     </modules>
 
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.22.2</version>
+            </plugin>
+        </plugins>
+    </build>
+
     <dependencies>
         <dependency>
             <groupId>com.fasterxml.jackson.core</groupId>
@@ -35,6 +45,22 @@
             <artifactId>jackson-dataformat-xml</artifactId>
             <version>${jackson.version}</version>
         </dependency>
+
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 
+    <properties>
+        <junit-jupiter.version>5.6.2</junit-jupiter.version>
+    </properties>
 </project>

jackson-simple/pom.xml

@@ -13,6 +13,25 @@
         <relativePath>../parent-java</relativePath>
     </parent>
 
+    <build>
+        <finalName>jackson-simple</finalName>
+
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.22.2</version>
+            </plugin>
+        </plugins>
+    </build>
+
     <dependencies>
         <!--jackson for xml -->
         <dependency>
@@ -20,7 +39,20 @@
             <artifactId>jackson-dataformat-xml</artifactId>
             <version>${jackson.version}</version>
         </dependency>
+
         <!-- test scoped -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+            <version>${junit-jupiter.version}</version>
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>org.assertj</groupId>
             <artifactId>assertj-core</artifactId>
@@ -29,18 +61,9 @@
         </dependency>
     </dependencies>
 
-    <build>
-        <finalName>jackson-simple</finalName>
-        <resources>
-            <resource>
-                <directory>src/main/resources</directory>
-                <filtering>true</filtering>
-            </resource>
-        </resources>
-    </build>
-
     <properties>
         <!-- testing -->
+        <junit-jupiter.version>5.6.2</junit-jupiter.version>
         <assertj.version>3.11.0</assertj.version>
     </properties>
 

libraries-3/README.md

@@ -16,5 +16,4 @@ Remember, for advanced libraries like [Jackson](/jackson) and [JUnit](/testing-m
 - [Introduction to Takes](https://www.baeldung.com/java-takes)
 - [Using NullAway to Avoid NullPointerExceptions](https://www.baeldung.com/java-nullaway)
 - [Introduction to Alibaba Arthas](https://www.baeldung.com/java-alibaba-arthas-intro)
-- [Quick Guide to Spring Cloud Circuit Breaker](https://www.baeldung.com/spring-cloud-circuit-breaker)
 - More articles [[<-- prev]](/libraries-2) [[next -->]](/libraries-4)