diff --git a/maven-modules/maven-build-optimization/pom.xml b/maven-modules/maven-build-optimization/pom.xml
index f0da31ceda..69533b4ef2 100644
--- a/maven-modules/maven-build-optimization/pom.xml
+++ b/maven-modules/maven-build-optimization/pom.xml
@@ -7,8 +7,8 @@
     <version>0.0.1-SNAPSHOT</version>
     <name>maven-build-optimization</name>
     <packaging>pom</packaging>
-	
-	<parent>
+
+    <parent>
         <groupId>com.baeldung</groupId>
         <artifactId>maven-modules</artifactId>
         <version>0.0.1-SNAPSHOT</version>
@@ -53,10 +53,10 @@
             </build>
         </profile>
     </profiles>
-	
+
     <properties>
         <failsafe.version>3.1.2</failsafe.version>
-        <profiler.version>1.7</profiler.version>	
-    </properties>	
+        <profiler.version>1.7</profiler.version>
+    </properties>
 
 </project>
\ No newline at end of file
diff --git a/maven-modules/resume-from/business/pom.xml b/maven-modules/resume-from/business/pom.xml
index 189be12a0f..6c5db6cbe1 100644
--- a/maven-modules/resume-from/business/pom.xml
+++ b/maven-modules/resume-from/business/pom.xml
@@ -1,7 +1,7 @@
 <?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">
+    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>business</artifactId>
     <version>1.0-SNAPSHOT</version>
@@ -24,5 +24,4 @@
         <maven.compiler.target>11</maven.compiler.target>
     </properties>
 
-
 </project>
\ No newline at end of file
diff --git a/maven-modules/resume-from/pom.xml b/maven-modules/resume-from/pom.xml
index 972395cbf2..d653d00d3b 100644
--- a/maven-modules/resume-from/pom.xml
+++ b/maven-modules/resume-from/pom.xml
@@ -1,7 +1,7 @@
 <?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">
+    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>
     <groupId>com.baeldung</groupId>
     <artifactId>resume-from</artifactId>
diff --git a/messaging-modules/pom.xml b/messaging-modules/pom.xml
index 6fd14f7c64..27524637ab 100644
--- a/messaging-modules/pom.xml
+++ b/messaging-modules/pom.xml
@@ -22,7 +22,7 @@
         <module>spring-amqp</module>
         <module>spring-apache-camel</module>
         <module>spring-jms</module>
-		<module>postgres-notify</module>
+        <module>postgres-notify</module>
     </modules>
 
 </project>
\ No newline at end of file
diff --git a/messaging-modules/postgres-notify/pom.xml b/messaging-modules/postgres-notify/pom.xml
index 174d66b7f5..876519f40c 100644
--- a/messaging-modules/postgres-notify/pom.xml
+++ b/messaging-modules/postgres-notify/pom.xml
@@ -42,37 +42,36 @@
             <artifactId>lombok</artifactId>
             <optional>true</optional>
         </dependency>
-        
+
     </dependencies>
 
+    <properties>
+        <java.version>1.8</java.version>
+    </properties>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+            </plugin>
+        </plugins>
+    </build>
 
-	<properties>
-		<java.version>1.8</java.version>
-	</properties>
-	<build>
-		<plugins>
-			<plugin>
-				<groupId>org.springframework.boot</groupId>
-				<artifactId>spring-boot-maven-plugin</artifactId>
-			</plugin>
-		</plugins>
-	</build>
-	
-	<profiles>
-		<profile>
-			<id>instance1</id>
-			<build>
-				<plugins>
-					<plugin>
-						<groupId>org.springframework.boot</groupId>
-						<artifactId>spring-boot-maven-plugin</artifactId>
-						<configuration>
-							<jvmArguments>-Dserver.port=8081</jvmArguments>						
-						</configuration>						
-					</plugin>
-				</plugins>
-			</build>
-		</profile>
-		
-	</profiles>
+    <profiles>
+        <profile>
+            <id>instance1</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.springframework.boot</groupId>
+                        <artifactId>spring-boot-maven-plugin</artifactId>
+                        <configuration>
+                            <jvmArguments>-Dserver.port=8081</jvmArguments>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+
+    </profiles>
 </project>
\ No newline at end of file
diff --git a/persistence-modules/pom.xml b/persistence-modules/pom.xml
index 24a55491d3..ee4699ecd8 100644
--- a/persistence-modules/pom.xml
+++ b/persistence-modules/pom.xml
@@ -85,7 +85,7 @@
         <module>spring-data-jpa-query-3</module>
         <module>spring-data-jpa-repo</module>
         <module>spring-data-jpa-repo-2</module>
-		<module>spring-data-jpa-repo-4</module>
+        <module>spring-data-jpa-repo-4</module>
         <module>spring-data-jdbc</module>
         <module>spring-data-keyvalue</module>
         <module>spring-data-mongodb</module>
diff --git a/persistence-modules/spring-boot-persistence-4/pom.xml b/persistence-modules/spring-boot-persistence-4/pom.xml
index 99c39e205d..7a6c2d2b17 100644
--- a/persistence-modules/spring-boot-persistence-4/pom.xml
+++ b/persistence-modules/spring-boot-persistence-4/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"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    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>
     <groupId>com.baeldung.boot.persistence</groupId>
     <artifactId>spring-boot-persistence-4</artifactId>
diff --git a/persistence-modules/spring-data-shardingsphere/pom.xml b/persistence-modules/spring-data-shardingsphere/pom.xml
index 1f37bed4cc..c1ca313038 100644
--- a/persistence-modules/spring-data-shardingsphere/pom.xml
+++ b/persistence-modules/spring-data-shardingsphere/pom.xml
@@ -1,7 +1,7 @@
 <?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">
+    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>spring-data-shardingsphere</artifactId>
     <version>1.0</version>
diff --git a/persistence-modules/spring-data-yugabytedb/pom.xml b/persistence-modules/spring-data-yugabytedb/pom.xml
index cf85988ac3..d7f7576cfe 100644
--- a/persistence-modules/spring-data-yugabytedb/pom.xml
+++ b/persistence-modules/spring-data-yugabytedb/pom.xml
@@ -1,7 +1,7 @@
 <?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">
+    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>spring-data-yugabytedb</artifactId>
     <version>1.0</version>