diff --git a/libraries-3/pom.xml b/libraries-3/pom.xml
index dbe6dd194f..fe007dfc4d 100644
--- a/libraries-3/pom.xml
+++ b/libraries-3/pom.xml
@@ -104,23 +104,23 @@
             <artifactId>velocity-engine-core</artifactId>
             <version>${velocity-engine-core.version}</version>
         </dependency>
-		<dependency>
-		    <groupId>com.uber.nullaway</groupId>
-		    <artifactId>nullaway</artifactId>
-		    <version>0.3.0</version>
-		</dependency>
-		<dependency>
-		    <groupId>org.codehaus.plexus</groupId>
-		    <artifactId>plexus-compiler-javac-errorprone</artifactId>
-		    <version>2.8</version>
-		</dependency>
-		<!-- override plexus-compiler-javac-errorprone's dependency on
-		       Error Prone with the latest version -->
-		<dependency>
-		    <groupId>com.google.errorprone</groupId>
-		    <artifactId>error_prone_core</artifactId>
-		    <version>2.1.3</version>
-		</dependency>
+	<dependency>
+            <groupId>com.uber.nullaway</groupId>
+            <artifactId>nullaway</artifactId>
+            <version>0.3.0</version>
+	</dependency>
+	<dependency>
+            <groupId>org.codehaus.plexus</groupId>
+            <artifactId>plexus-compiler-javac-errorprone</artifactId>
+            <version>2.8</version>
+	</dependency>
+	<!-- override plexus-compiler-javac-errorprone's dependency on
+             Error Prone with the latest version -->
+	<dependency>
+            <groupId>com.google.errorprone</groupId>
+            <artifactId>error_prone_core</artifactId>
+            <version>2.1.3</version>
+	</dependency>
     </dependencies>
 
     <repositories>
@@ -158,32 +158,32 @@
                 </dependencies>
             </plugin>
 			
-			<plugin>
-			    <groupId>org.apache.maven.plugins</groupId>
-			    <artifactId>maven-compiler-plugin</artifactId>
-			    <version>3.5</version>
-			    <configuration>
-			        <compilerId>javac-with-errorprone</compilerId>
-			        <forceJavacCompilerUse>true</forceJavacCompilerUse>
-			        <source>1.8</source>
-			        <target>1.8</target>
-			        <showWarnings>true</showWarnings>
-			        <annotationProcessorPaths>
-			            <path>
-			                <groupId>com.uber.nullaway</groupId>
-			                <artifactId>nullaway</artifactId>
-			                <version>0.3.0</version>
-			            </path>
-			        </annotationProcessorPaths>
-			        <compilerArgs>
-			            <!-- NullAway will warn by default, uncomment the next line to make the build fail -->
-			            <!-- <arg>-Xep:NullAway:ERROR</arg> -->
-			            <arg>-XepExcludedPaths:(.*)/test/.*|(.*)/streamex/.*</arg>
-			            <arg>-XepOpt:NullAway:AnnotatedPackages=com.baeldung.nullaway</arg>
-			        </compilerArgs>
-			    </configuration>
-			    <dependencies>
-			        <dependency>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+		<artifactId>maven-compiler-plugin</artifactId>
+		<version>3.5</version>
+		<configuration>
+                    <compilerId>javac-with-errorprone</compilerId>
+                    <forceJavacCompilerUse>true</forceJavacCompilerUse>
+                    <source>1.8</source>
+                    <target>1.8</target>
+                    <showWarnings>true</showWarnings>
+                    <annotationProcessorPaths>
+                        <path>
+                            <groupId>com.uber.nullaway</groupId>
+                            <artifactId>nullaway</artifactId>
+                            <version>0.3.0</version>
+                        </path>
+                    </annotationProcessorPaths>
+                    <compilerArgs>
+                        <!-- NullAway will warn by default, uncomment the next line to make the build fail -->
+                        <!-- <arg>-Xep:NullAway:ERROR</arg> -->
+                        <arg>-XepExcludedPaths:(.*)/test/.*|(.*)/streamex/.*</arg>
+                        <arg>-XepOpt:NullAway:AnnotatedPackages=com.baeldung.nullaway</arg>
+                    </compilerArgs>
+                </configuration>
+                <dependencies>
+                    <dependency>
                         <groupId>org.codehaus.plexus</groupId>
                         <artifactId>plexus-compiler-javac-errorprone</artifactId>
                         <version>2.8</version>