diff --git a/maven-modules/maven-simple/maven-dependency/pom.xml b/maven-modules/maven-simple/maven-dependency/pom.xml
index ac4902e1ad..628c1b62d4 100644
--- a/maven-modules/maven-simple/maven-dependency/pom.xml
+++ b/maven-modules/maven-simple/maven-dependency/pom.xml
@@ -1,37 +1,37 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xmlns="http://maven.apache.org/POM/4.0.0"
-	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>maven-dependency</artifactId>
-	<version>1.0.0-SNAPSHOT</version>
-	<packaging>pom</packaging>
+    xmlns="http://maven.apache.org/POM/4.0.0"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>maven-dependency</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <packaging>pom</packaging>
 
-	<parent>
-		<groupId>com.baeldung</groupId>
-		<artifactId>maven-simple</artifactId>
-		<version>0.0.1-SNAPSHOT</version>
-	</parent>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>maven-simple</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
 
-	<dependencyManagement>
-		<dependencies>
-			<dependency>
-				<groupId>org.apache.commons</groupId>
-				<artifactId>commons-lang3</artifactId>
-				<version>${commons-lang3.version}</version>
-			</dependency>
-		</dependencies>
-	</dependencyManagement>
+    <dependencyManagement>
+        <dependencies>
+            <dependency>
+                <groupId>org.apache.commons</groupId>
+                <artifactId>commons-lang3</artifactId>
+                <version>${commons-lang3.version}</version>
+            </dependency>
+        </dependencies>
+    </dependencyManagement>
 
-	<dependencies>
-		<dependency>
-			<groupId>org.junit.vintage</groupId>
-			<artifactId>junit-vintage-engine</artifactId>
-		</dependency>
-		<dependency>
-			<groupId>org.apache.commons</groupId>
-			<artifactId>commons-lang3</artifactId>
-		</dependency>
-	</dependencies>
+    <dependencies>
+        <dependency>
+            <groupId>org.junit.vintage</groupId>
+            <artifactId>junit-vintage-engine</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+        </dependency>
+    </dependencies>
 
 </project>
\ No newline at end of file
diff --git a/maven-modules/maven-simple/maven-profiles/pom.xml b/maven-modules/maven-simple/maven-profiles/pom.xml
index 1168350de9..322dada104 100644
--- a/maven-modules/maven-simple/maven-profiles/pom.xml
+++ b/maven-modules/maven-simple/maven-profiles/pom.xml
@@ -1,96 +1,96 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-	<modelVersion>4.0.0</modelVersion>
-	<groupId>com.baeldung</groupId>
-	<artifactId>maven-profiles</artifactId>
-	<version>0.0.1-SNAPSHOT</version>
-	<name>maven-profiles</name>
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>com.baeldung</groupId>
+    <artifactId>maven-profiles</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>maven-profiles</name>
 
-	<profiles>
-		<profile>
-			<id>no-tests</id>
-			<properties>
-				<maven.test.skip>true</maven.test.skip>
-			</properties>
-		</profile>
-		<profile>
-			<id>integration-tests</id>
-			<activation>
-				<activeByDefault>true</activeByDefault>
-			</activation>
-		</profile>
-		<profile>
-			<id>mutation-tests</id>
-		</profile>
-		<profile>
-			<id>active-on-jdk-11</id>
-			<activation>
-				<jdk>11</jdk>
-			</activation>
-		</profile>
-		<profile>
-			<id>active-on-windows-10</id>
-			<activation>
-				<os>
-					<name>windows 10</name>
-					<family>Windows</family>
-					<arch>amd64</arch>
-					<version>10.0</version>
-				</os>
-			</activation>
-		</profile>
-		<profile>
-			<id>active-on-property-environment</id>
-			<activation>
-				<property>
-					<name>environment</name>
-					<value>!test</value>
-				</property>
-			</activation>
-		</profile>
-		<profile>
-			<id>active-on-missing-file</id>
-			<activation>
-				<file>
-					<missing>target/testreport.html</missing>
-				</file>
-			</activation>
-		</profile>
-		<profile>
-			<id>active-on-present-file</id>
-			<activation>
-				<file>
-					<exists>target/artifact.jar</exists>
-				</file>
-			</activation>
-		</profile>
-		<profile>
-			<id>show-active-profiles</id>
-			<build>
-				<plugins>
-					<plugin>
-						<groupId>org.apache.maven.plugins</groupId>
-						<artifactId>maven-help-plugin</artifactId>
-						<version>${help.plugin.version}</version>
-						<executions>
-							<execution>
-								<id>show-profiles</id>
-								<phase>compile</phase>
-								<goals>
-									<goal>active-profiles</goal>
-								</goals>
-							</execution>
-						</executions>
-					</plugin>
-				</plugins>
-			</build>
-		</profile>
-	</profiles>
+    <profiles>
+        <profile>
+            <id>no-tests</id>
+            <properties>
+                <maven.test.skip>true</maven.test.skip>
+            </properties>
+        </profile>
+        <profile>
+            <id>integration-tests</id>
+            <activation>
+                <activeByDefault>true</activeByDefault>
+            </activation>
+        </profile>
+        <profile>
+            <id>mutation-tests</id>
+        </profile>
+        <profile>
+            <id>active-on-jdk-11</id>
+            <activation>
+                <jdk>11</jdk>
+            </activation>
+        </profile>
+        <profile>
+            <id>active-on-windows-10</id>
+            <activation>
+                <os>
+                    <name>windows 10</name>
+                    <family>Windows</family>
+                    <arch>amd64</arch>
+                    <version>10.0</version>
+                </os>
+            </activation>
+        </profile>
+        <profile>
+            <id>active-on-property-environment</id>
+            <activation>
+                <property>
+                    <name>environment</name>
+                    <value>!test</value>
+                </property>
+            </activation>
+        </profile>
+        <profile>
+            <id>active-on-missing-file</id>
+            <activation>
+                <file>
+                    <missing>target/testreport.html</missing>
+                </file>
+            </activation>
+        </profile>
+        <profile>
+            <id>active-on-present-file</id>
+            <activation>
+                <file>
+                    <exists>target/artifact.jar</exists>
+                </file>
+            </activation>
+        </profile>
+        <profile>
+            <id>show-active-profiles</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-help-plugin</artifactId>
+                        <version>${help.plugin.version}</version>
+                        <executions>
+                            <execution>
+                                <id>show-profiles</id>
+                                <phase>compile</phase>
+                                <goals>
+                                    <goal>active-profiles</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
 
-	<properties>
-		<help.plugin.version>3.2.0</help.plugin.version>
-	</properties>
+    <properties>
+        <help.plugin.version>3.2.0</help.plugin.version>
+    </properties>
 
 </project>
\ No newline at end of file
diff --git a/maven-modules/maven-simple/parent-project/core/pom.xml b/maven-modules/maven-simple/parent-project/core/pom.xml
index 5ae3f6a0bb..ec25c9ace5 100644
--- a/maven-modules/maven-simple/parent-project/core/pom.xml
+++ b/maven-modules/maven-simple/parent-project/core/pom.xml
@@ -1,16 +1,16 @@
 <?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>org.baeldung</groupId>
-	<artifactId>core</artifactId>
-	<name>core</name>
+    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>org.baeldung</groupId>
+    <artifactId>core</artifactId>
+    <name>core</name>
 
-	<parent>
-		<artifactId>parent-project</artifactId>
-		<groupId>com.baeldung</groupId>
-		<version>1.0-SNAPSHOT</version>
-	</parent>
+    <parent>
+        <artifactId>parent-project</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
 
 </project>
diff --git a/maven-modules/maven-simple/parent-project/pom.xml b/maven-modules/maven-simple/parent-project/pom.xml
index 7d541a3353..a68f8e63bc 100644
--- a/maven-modules/maven-simple/parent-project/pom.xml
+++ b/maven-modules/maven-simple/parent-project/pom.xml
@@ -1,22 +1,22 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
-	<modelVersion>4.0.0</modelVersion>
-	<artifactId>parent-project</artifactId>
-	<version>1.0-SNAPSHOT</version>
-	<name>parent-project</name>
-	<packaging>pom</packaging>
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    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>
+    <artifactId>parent-project</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>parent-project</name>
+    <packaging>pom</packaging>
 
-	<parent>
-		<groupId>com.baeldung</groupId>
-		<artifactId>maven-simple</artifactId>
-		<version>0.0.1-SNAPSHOT</version>
-	</parent>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>maven-simple</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
 
-	<modules>
-		<module>core</module>
-		<module>service</module>
-		<module>webapp</module>
-	</modules>
+    <modules>
+        <module>core</module>
+        <module>service</module>
+        <module>webapp</module>
+    </modules>
 </project>
diff --git a/maven-modules/maven-simple/parent-project/service/pom.xml b/maven-modules/maven-simple/parent-project/service/pom.xml
index b20b3ad1d2..1953ec8638 100644
--- a/maven-modules/maven-simple/parent-project/service/pom.xml
+++ b/maven-modules/maven-simple/parent-project/service/pom.xml
@@ -1,16 +1,16 @@
 <?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>org.baeldung</groupId>
-	<artifactId>service</artifactId>
-	<name>service</name>
+    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>org.baeldung</groupId>
+    <artifactId>service</artifactId>
+    <name>service</name>
 
-	<parent>
-		<artifactId>parent-project</artifactId>
-		<groupId>com.baeldung</groupId>
-		<version>1.0-SNAPSHOT</version>
-	</parent>
+    <parent>
+        <artifactId>parent-project</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
 
 </project>
diff --git a/maven-modules/maven-simple/parent-project/webapp/pom.xml b/maven-modules/maven-simple/parent-project/webapp/pom.xml
index 05594d0995..bd13c5aeb8 100644
--- a/maven-modules/maven-simple/parent-project/webapp/pom.xml
+++ b/maven-modules/maven-simple/parent-project/webapp/pom.xml
@@ -1,16 +1,16 @@
 <?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>org.baeldung</groupId>
-	<artifactId>webapp</artifactId>
-	<name>webapp</name>
+    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>org.baeldung</groupId>
+    <artifactId>webapp</artifactId>
+    <name>webapp</name>
 
-	<parent>
-		<artifactId>parent-project</artifactId>
-		<groupId>com.baeldung</groupId>
-		<version>1.0-SNAPSHOT</version>
-	</parent>
+    <parent>
+        <artifactId>parent-project</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
 
 </project>
diff --git a/maven-modules/maven-simple/plugin-management/pom.xml b/maven-modules/maven-simple/plugin-management/pom.xml
index 9ca65dd549..2fb2d5ed41 100644
--- a/maven-modules/maven-simple/plugin-management/pom.xml
+++ b/maven-modules/maven-simple/plugin-management/pom.xml
@@ -1,63 +1,63 @@
 <?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>plugin-management</artifactId>
-	<packaging>pom</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>plugin-management</artifactId>
+    <packaging>pom</packaging>
 
-	<parent>
-		<artifactId>maven-simple</artifactId>
-		<groupId>com.baeldung</groupId>
-		<version>0.0.1-SNAPSHOT</version>
-	</parent>
+    <parent>
+        <artifactId>maven-simple</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
 
-	<modules>
-		<module>submodule-1</module>
-		<module>submodule-2</module>
-	</modules>
+    <modules>
+        <module>submodule-1</module>
+        <module>submodule-2</module>
+    </modules>
 
-	<build>
-		<pluginManagement>
-			<plugins>
-				<plugin>
-					<groupId>org.codehaus.mojo</groupId>
-					<artifactId>build-helper-maven-plugin</artifactId>
-					<version>${maven.bulid.helper.plugin}</version>
-					<executions>
-						<execution>
-							<id>add-resource</id>
-							<phase>generate-resources</phase>
-							<goals>
-								<goal>add-resource</goal>
-							</goals>
-							<configuration>
-								<resources>
-									<resource>
-										<directory>src/resources</directory>
-										<targetPath>json</targetPath>
-									</resource>
-								</resources>
-							</configuration>
-						</execution>
-					</executions>
-				</plugin>
-				<plugin>
-					<groupId>org.apache.maven.plugins</groupId>
-					<artifactId>maven-compiler-plugin</artifactId>
-					<version>${maven.compiler.plugin}</version>
-					<configuration>
-						<source>1.8</source>
-						<target>1.8</target>
-					</configuration>
-				</plugin>
-			</plugins>
-		</pluginManagement>
-	</build>
+    <build>
+        <pluginManagement>
+            <plugins>
+                <plugin>
+                    <groupId>org.codehaus.mojo</groupId>
+                    <artifactId>build-helper-maven-plugin</artifactId>
+                    <version>${maven.bulid.helper.plugin}</version>
+                    <executions>
+                        <execution>
+                            <id>add-resource</id>
+                            <phase>generate-resources</phase>
+                            <goals>
+                                <goal>add-resource</goal>
+                            </goals>
+                            <configuration>
+                                <resources>
+                                    <resource>
+                                        <directory>src/resources</directory>
+                                        <targetPath>json</targetPath>
+                                    </resource>
+                                </resources>
+                            </configuration>
+                        </execution>
+                    </executions>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <version>${maven.compiler.plugin}</version>
+                    <configuration>
+                        <source>1.8</source>
+                        <target>1.8</target>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </pluginManagement>
+    </build>
 
-	<properties>
-		<maven.compiler.plugin>3.8.1</maven.compiler.plugin>
-		<maven.bulid.helper.plugin>3.2.0</maven.bulid.helper.plugin>
-	</properties>
+    <properties>
+        <maven.compiler.plugin>3.8.1</maven.compiler.plugin>
+        <maven.bulid.helper.plugin>3.2.0</maven.bulid.helper.plugin>
+    </properties>
 
 </project>
\ No newline at end of file
diff --git a/maven-modules/maven-simple/plugin-management/submodule-2/pom.xml b/maven-modules/maven-simple/plugin-management/submodule-2/pom.xml
index df460ec159..e50d3cc26d 100644
--- a/maven-modules/maven-simple/plugin-management/submodule-2/pom.xml
+++ b/maven-modules/maven-simple/plugin-management/submodule-2/pom.xml
@@ -1,14 +1,14 @@
 <?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>submodule-2</artifactId>
+    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>submodule-2</artifactId>
 
-	<parent>
-		<artifactId>plugin-management</artifactId>
-		<groupId>com.baeldung</groupId>
-		<version>0.0.1-SNAPSHOT</version>
-	</parent>
+    <parent>
+        <artifactId>plugin-management</artifactId>
+        <groupId>com.baeldung</groupId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
 
 </project>
\ No newline at end of file
diff --git a/maven-modules/maven-simple/pom.xml b/maven-modules/maven-simple/pom.xml
index 78e4e8df46..938e2240f8 100644
--- a/maven-modules/maven-simple/pom.xml
+++ b/maven-modules/maven-simple/pom.xml
@@ -1,23 +1,23 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 <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>maven-simple</artifactId>
-	<name>maven-simple</name>
-	<packaging>pom</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>maven-simple</artifactId>
+    <name>maven-simple</name>
+    <packaging>pom</packaging>
 
-	<parent>
-		<groupId>com.baeldung</groupId>
-		<artifactId>maven-modules</artifactId>
-		<version>0.0.1-SNAPSHOT</version>
-	</parent>
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>maven-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
 
-	<modules>
-		<module>maven-profiles</module>
-		<module>plugin-management</module>
-		<module>maven-dependency</module>
-		<module>parent-project</module>
-	</modules>
+    <modules>
+        <module>maven-profiles</module>
+        <module>plugin-management</module>
+        <module>maven-dependency</module>
+        <module>parent-project</module>
+    </modules>
 
 </project>
\ No newline at end of file