diff --git a/core-java-modules/core-java-arrays-3/pom.xml b/core-java-modules/core-java-arrays-3/pom.xml
index b39a9af653..516d9b2b37 100644
--- a/core-java-modules/core-java-arrays-3/pom.xml
+++ b/core-java-modules/core-java-arrays-3/pom.xml
@@ -1,31 +1,31 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <artifactId>core-java-arrays-3</artifactId>
-    <version>0.1.0-SNAPSHOT</version>
-    <name>core-java-arrays-3</name>
-    <packaging>jar</packaging>
+	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-arrays-3</artifactId>
+	<version>0.1.0-SNAPSHOT</version>
+	<name>core-java-arrays-3</name>
+	<packaging>jar</packaging>
 
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-java</artifactId>
-        <version>0.0.1-SNAPSHOT</version>
-        <relativePath>../../parent-java</relativePath>
-    </parent>
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-java</artifactId>
+		<version>0.0.1-SNAPSHOT</version>
+		<relativePath>../../parent-java</relativePath>
+	</parent>
 
-    <dependencies>
-        <dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-core</artifactId>
-            <version>${assertj.version}</version>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
+	<dependencies>
+		<dependency>
+			<groupId>org.assertj</groupId>
+			<artifactId>assertj-core</artifactId>
+			<version>${assertj.version}</version>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
 
-    <properties>
-        <assertj.version>3.14.0</assertj.version>
-    </properties>
+	<properties>
+		<assertj.version>3.14.0</assertj.version>
+	</properties>
 
 </project>
\ No newline at end of file
diff --git a/core-java-modules/core-java-arrays-3/src/test/java/com/baeldung/arrays/deepequals/ArraysDeepEqualsUnitTest.java b/core-java-modules/core-java-arrays-3/src/test/java/com/baeldung/arrays/deepequals/ArraysDeepEqualsUnitTest.java
index aa577ea7bd..a9b8ed7e3f 100644
--- a/core-java-modules/core-java-arrays-3/src/test/java/com/baeldung/arrays/deepequals/ArraysDeepEqualsUnitTest.java
+++ b/core-java-modules/core-java-arrays-3/src/test/java/com/baeldung/arrays/deepequals/ArraysDeepEqualsUnitTest.java
@@ -9,92 +9,88 @@ import org.junit.jupiter.api.Test;
 
 public class ArraysDeepEqualsUnitTest {
 
-	class Person {
-		private int id;
-		private String name;
-		private int age;
+    class Person {
+        private int id;
+        private String name;
+        private int age;
 
-		Person(int id, String name, int age) {
-			this.id = id;
-			this.name = name;
-			this.age = age;
-		}
+        Person(int id, String name, int age) {
+            this.id = id;
+            this.name = name;
+            this.age = age;
+        }
 
-		@Override
-		public boolean equals(Object obj) {
-			if (this == obj) {
-				return true;
-			}
-			if (obj == null) {
-				return false;
-			}
-			if (!(obj instanceof Person))
-				return false;
-			Person person = (Person) obj;
-			return id == person.id && name.equals(person.name) && age == person.age;
-		}
+        @Override
+        public boolean equals(Object obj) {
+            if (this == obj) {
+                return true;
+            }
+            if (obj == null) {
+                return false;
+            }
+            if (!(obj instanceof Person))
+                return false;
+            Person person = (Person) obj;
+            return id == person.id && name.equals(person.name) && age == person.age;
+        }
 
-		@Override
-		public int hashCode() {
-			return Objects.hash(id, name, age);
-		}
-	}
+        @Override
+        public int hashCode() {
+            return Objects.hash(id, name, age);
+        }
+    }
 
-	@Test
-	void givenTwoUnidimensionalObjectTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnTrue() {
-		Object[] anArray = new Object[] { "string1", "string2", "string3" };
-		Object[] anotherArray = new Object[] { "string1", "string2", "string3" };
+    @Test
+    void givenTwoUnidimensionalObjectTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnTrue() {
+        Object[] anArray = new Object[] { "string1", "string2", "string3" };
+        Object[] anotherArray = new Object[] { "string1", "string2", "string3" };
 
-		assertTrue(Arrays.equals(anArray, anotherArray));
-		assertTrue(Arrays.deepEquals(anArray, anotherArray));
-	}
+        assertTrue(Arrays.equals(anArray, anotherArray));
+        assertTrue(Arrays.deepEquals(anArray, anotherArray));
+    }
 
-	@Test
-	void givenTwoUnidimensionalObjectTypeArraysWithNullElements_whenUsingEqualsAndDeepEquals_thenBothShouldReturnTrue() {
-		Object[] anArray = new Object[] { "string1", null, "string3" };
-		Object[] anotherArray = new Object[] { "string1", null, "string3" };
+    @Test
+    void givenTwoUnidimensionalObjectTypeArraysWithNullElements_whenUsingEqualsAndDeepEquals_thenBothShouldReturnTrue() {
+        Object[] anArray = new Object[] { "string1", null, "string3" };
+        Object[] anotherArray = new Object[] { "string1", null, "string3" };
 
-		assertTrue(Arrays.equals(anArray, anotherArray));
-		assertTrue(Arrays.deepEquals(anArray, anotherArray));
-	}
+        assertTrue(Arrays.equals(anArray, anotherArray));
+        assertTrue(Arrays.deepEquals(anArray, anotherArray));
+    }
 
-	@Test
-	void givenTwoUnidimensionalObjectTypeArraysWithNestedElements_whenUsingEqualsAndDeepEquals_thenShouldReturnDifferently() {
-		Object[] anArray = new Object[] { "string1", null, new String[] { "nestedString1", "nestedString2" } };
-		Object[] anotherArray = new Object[] { "string1", null, new String[] { "nestedString1", "nestedString2" } };
+    @Test
+    void givenTwoUnidimensionalObjectTypeArraysWithNestedElements_whenUsingEqualsAndDeepEquals_thenShouldReturnDifferently() {
+        Object[] anArray = new Object[] { "string1", null, new String[] { "nestedString1", "nestedString2" } };
+        Object[] anotherArray = new Object[] { "string1", null, new String[] { "nestedString1", "nestedString2" } };
 
-		assertFalse(Arrays.equals(anArray, anotherArray));
-		assertTrue(Arrays.deepEquals(anArray, anotherArray));
-	}
+        assertFalse(Arrays.equals(anArray, anotherArray));
+        assertTrue(Arrays.deepEquals(anArray, anotherArray));
+    }
 
-	@Test
-	void givenTwoMultidimensionalPrimitiveTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnDifferently() {
-		int[][] anArray = { { 1, 2, 3 }, { 4, 5, 6, 9 }, { 7 } };
-		int[][] anotherArray = { { 1, 2, 3 }, { 4, 5, 6, 9 }, { 7 } };
+    @Test
+    void givenTwoMultidimensionalPrimitiveTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnDifferently() {
+        int[][] anArray = { { 1, 2, 3 }, { 4, 5, 6, 9 }, { 7 } };
+        int[][] anotherArray = { { 1, 2, 3 }, { 4, 5, 6, 9 }, { 7 } };
 
-		assertFalse(Arrays.equals(anArray, anotherArray));
-		assertTrue(Arrays.deepEquals(anArray, anotherArray));
-	}
+        assertFalse(Arrays.equals(anArray, anotherArray));
+        assertTrue(Arrays.deepEquals(anArray, anotherArray));
+    }
 
-	@Test
-	void givenTwoMultidimensionalObjectTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnDifferently() {
-		Person personArray1[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) },
-				{ new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
-		Person personArray2[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) },
-				{ new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
+    @Test
+    void givenTwoMultidimensionalObjectTypeArrays_whenUsingEqualsAndDeepEquals_thenBothShouldReturnDifferently() {
+        Person personArray1[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
+        Person personArray2[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
 
-		assertFalse(Arrays.equals(personArray1, personArray2));
-		assertTrue(Arrays.deepEquals(personArray1, personArray2));
-	}
+        assertFalse(Arrays.equals(personArray1, personArray2));
+        assertTrue(Arrays.deepEquals(personArray1, personArray2));
+    }
 
-	@Test
-	void givenTwoMultidimensionalObjectTypeArrays_whenUsingDeepEqualsFromObjectsAndArraysClasses_thenBothShouldReturnTrue() {
-		Person personArray1[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) },
-				{ new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
-		Person personArray2[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) },
-				{ new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
+    @Test
+    void givenTwoMultidimensionalObjectTypeArrays_whenUsingDeepEqualsFromObjectsAndArraysClasses_thenBothShouldReturnTrue() {
+        Person personArray1[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
+        Person personArray2[][] = { { new Person(1, "John", 22), new Person(2, "Mike", 23) }, { new Person(3, "Steve", 27), new Person(4, "Gary", 28) } };
 
-		assertTrue(Objects.deepEquals(personArray1, personArray2));
-		assertTrue(Arrays.deepEquals(personArray1, personArray2));
-	}
+        assertTrue(Objects.deepEquals(personArray1, personArray2));
+        assertTrue(Arrays.deepEquals(personArray1, personArray2));
+    }
 }
diff --git a/core-java-modules/pom.xml b/core-java-modules/pom.xml
index 771d5a5d61..60e1dbf3ef 100644
--- a/core-java-modules/pom.xml
+++ b/core-java-modules/pom.xml
@@ -1,124 +1,121 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-    <groupId>com.baeldung.core-java-modules</groupId>
-    <artifactId>core-java-modules</artifactId>
-    <name>core-java-modules</name>
-    <packaging>pom</packaging>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>com.baeldung.core-java-modules</groupId>
+	<artifactId>core-java-modules</artifactId>
+	<name>core-java-modules</name>
+	<packaging>pom</packaging>
 
-    <parent>
-        <groupId>com.baeldung</groupId>
-        <artifactId>parent-modules</artifactId>
-        <version>1.0.0-SNAPSHOT</version>
-    </parent>
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-modules</artifactId>
+		<version>1.0.0-SNAPSHOT</version>
+	</parent>
 
-    <modules>
-        <module>core-java</module>
-        <!-- <module>core-java-10</module> --> <!-- We haven't upgraded to java 10. Fixing in BAEL-10841 -->
-        <!-- <module>core-java-11</module> --> <!-- We haven't upgraded to java 11. Fixing in BAEL-10841 -->
-        <!-- <module>core-java-12</module> --> <!-- We haven't upgraded to java 12. Fixing in BAEL-10841 -->
-        <!-- <module>core-java-13</module> --> <!-- We haven't upgraded to java 12. Fixing in BAEL-10841 -->
-        <module>core-java-8</module>
-        <module>core-java-8-2</module>
+	<modules>
+		<module>core-java</module>
+		<!-- <module>core-java-10</module> --> <!-- We haven't upgraded to java 10. Fixing in BAEL-10841 -->
+		<!-- <module>core-java-11</module> --> <!-- We haven't upgraded to java 11. Fixing in BAEL-10841 -->
+		<!-- <module>core-java-12</module> --> <!-- We haven't upgraded to java 12. Fixing in BAEL-10841 -->
+		<!-- <module>core-java-13</module> --> <!-- We haven't upgraded to java 12. Fixing in BAEL-10841 -->
+		<module>core-java-8</module>
+		<module>core-java-8-2</module>
 
-        <!-- <module>core-java-9</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
-        <!-- <module>core-java-9-improvements</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
-        <!-- <module>core-java-9-jigsaw</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
-        <!-- <module>core-java-9-new-features</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
-        <!-- <module>core-java-9-streams</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
+		<!-- <module>core-java-9</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
+		<!-- <module>core-java-9-improvements</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
+		<!-- <module>core-java-9-jigsaw</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
+		<!-- <module>core-java-9-new-features</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
+		<!-- <module>core-java-9-streams</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
 
-        <module>core-java-annotations</module>
-        <module>core-java-arrays</module>
-        <module>core-java-arrays-2</module>
+		<module>core-java-annotations</module>
+		<module>core-java-arrays</module>
+		<module>core-java-arrays-2</module>
 		<module>core-java-arrays-3</module>
 
-        <module>core-java-collections</module>
-        <module>core-java-collections-2</module>
-        <module>core-java-collections-3</module>
-        <module>core-java-collections-array-list</module>
-        <module>core-java-collections-list</module>
-        <module>core-java-collections-list-2</module>
-        <module>core-java-collections-list-3</module>
-        <module>core-java-collections-set</module>
+		<module>core-java-collections</module>
+		<module>core-java-collections-2</module>
+		<module>core-java-collections-3</module>
+		<module>core-java-collections-array-list</module>
+		<module>core-java-collections-list</module>
+		<module>core-java-collections-list-2</module>
+		<module>core-java-collections-list-3</module>
+		<module>core-java-collections-set</module>
 
-        <module>core-java-concurrency-2</module>
-        <module>core-java-concurrency-advanced</module>
-        <module>core-java-concurrency-advanced-2</module>
-        <module>core-java-concurrency-advanced-3</module>
-        <module>core-java-concurrency-basic</module>
-        <module>core-java-concurrency-basic-2</module>
-        <module>core-java-concurrency-collections</module>
+		<module>core-java-concurrency-2</module>
+		<module>core-java-concurrency-advanced</module>
+		<module>core-java-concurrency-advanced-2</module>
+		<module>core-java-concurrency-advanced-3</module>
+		<module>core-java-concurrency-basic</module>
+		<module>core-java-concurrency-basic-2</module>
+		<module>core-java-concurrency-collections</module>
 
-        <!-- <module>core-java-date-operations-1</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
-        <module>core-java-date-operations-2</module>
-        <!-- We haven't upgraded to java 9.-->
-        <!--
-        <module>core-java-datetime-computations</module>
-        <module>core-java-datetime-conversion</module>
-        <module>core-java-datetime-java8</module>
-        <module>core-java-datetime-string</module>
-        -->
+		<!-- <module>core-java-date-operations-1</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
+		<module>core-java-date-operations-2</module>
+		<!-- We haven't upgraded to java 9. -->
+		<!-- <module>core-java-datetime-computations</module> <module>core-java-datetime-conversion</module> 
+			<module>core-java-datetime-java8</module> <module>core-java-datetime-string</module> -->
 
-        <module>core-java-exceptions</module>
-        <module>core-java-exceptions-2</module>
+		<module>core-java-exceptions</module>
+		<module>core-java-exceptions-2</module>
 
-        <module>core-java-function</module>
+		<module>core-java-function</module>
 
-        <module>core-java-io</module>
-        <module>core-java-io-2</module>
-        <module>core-java-io-apis</module>
-        <module>core-java-io-conversions</module>
+		<module>core-java-io</module>
+		<module>core-java-io-2</module>
+		<module>core-java-io-apis</module>
+		<module>core-java-io-conversions</module>
 
-        <module>core-java-jar</module>
-        <module>core-java-jndi</module>
-        <!-- <module>core-java-jpms</module> --> <!-- We haven't upgraded to java 10. Fixing in BAEL-10841 -->
-        <module>core-java-jvm</module>		
+		<module>core-java-jar</module>
+		<module>core-java-jndi</module>
+		<!-- <module>core-java-jpms</module> --> <!-- We haven't upgraded to java 10. Fixing in BAEL-10841 -->
+		<module>core-java-jvm</module>
 
-        <module>core-java-lambdas</module>
-        <module>core-java-lang</module>
-        <module>core-java-lang-2</module>
-        <module>core-java-lang-math</module>
-        <module>core-java-lang-oop</module>
-        <module>core-java-lang-oop-2</module>
-        <module>core-java-lang-oop-3</module>
-        <module>core-java-lang-oop-4</module>
-        <module>core-java-lang-operators</module>
-        <module>core-java-lang-syntax</module>
-        <module>core-java-lang-syntax-2</module>
+		<module>core-java-lambdas</module>
+		<module>core-java-lang</module>
+		<module>core-java-lang-2</module>
+		<module>core-java-lang-math</module>
+		<module>core-java-lang-oop</module>
+		<module>core-java-lang-oop-2</module>
+		<module>core-java-lang-oop-3</module>
+		<module>core-java-lang-oop-4</module>
+		<module>core-java-lang-operators</module>
+		<module>core-java-lang-syntax</module>
+		<module>core-java-lang-syntax-2</module>
 
-        <module>core-java-networking</module>
-        <module>core-java-networking-2</module>
-        <module>core-java-nio</module>
-        <module>core-java-nio-2</module>
+		<module>core-java-networking</module>
+		<module>core-java-networking-2</module>
+		<module>core-java-nio</module>
+		<module>core-java-nio-2</module>
 
-        <module>core-java-optional</module>
-        <!--<module>core-java-os</module> --> <!-- We haven't upgraded to java 9.-->
+		<module>core-java-optional</module>
+		<!--<module>core-java-os</module> --> <!-- We haven't upgraded to java 9. -->
 
-        <module>core-java-perf</module>
+		<module>core-java-perf</module>
 
-        <module>core-java-reflection</module>
+		<module>core-java-reflection</module>
 
-        <module>core-java-security</module>
-        <module>core-java-streams</module>
-        <module>core-java-streams-2</module>
-        <module>core-java-streams-3</module>
-        <module>core-java-string-algorithms</module>
-        <module>core-java-string-algorithms-2</module>
-        <module>core-java-string-algorithms-3</module>
-        <module>core-java-string-apis</module>
-        <module>core-java-string-conversions</module>
-        <module>core-java-string-conversions-2</module>
-        <module>core-java-string-operations</module>
-        <module>core-java-string-operations-2</module>
-        <module>core-java-strings</module>
-        <module>core-java-sun</module>
+		<module>core-java-security</module>
+		<module>core-java-streams</module>
+		<module>core-java-streams-2</module>
+		<module>core-java-streams-3</module>
+		<module>core-java-string-algorithms</module>
+		<module>core-java-string-algorithms-2</module>
+		<module>core-java-string-algorithms-3</module>
+		<module>core-java-string-apis</module>
+		<module>core-java-string-conversions</module>
+		<module>core-java-string-conversions-2</module>
+		<module>core-java-string-operations</module>
+		<module>core-java-string-operations-2</module>
+		<module>core-java-strings</module>
+		<module>core-java-sun</module>
 
-        <module>core-java-text</module>
-        <!-- <module>core-java-time-measurements</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
+		<module>core-java-text</module>
+		<!-- <module>core-java-time-measurements</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
 
-        <!-- <module>multimodulemavenproject</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
-        <module>pre-jpms</module>
-    </modules>
+		<!-- <module>multimodulemavenproject</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
+		<module>pre-jpms</module>
+	</modules>
 
 </project>