Enable spotless plugin - automatic code formatting

pom.xml

@@ -33,10 +33,8 @@
 
   <name>Maven Flatten Plugin</name>
 
-  <description>
-    Plugin to generate flattened POM (reduced and resolved information required for consumers of maven repositories)
-    and to use (install, sign, deploy) it instead of original pom.xml.
-  </description>
+  <description>Plugin to generate flattened POM (reduced and resolved information required for consumers of maven repositories)
+    and to use (install, sign, deploy) it instead of original pom.xml.</description>
 
   <url>https://www.mojohaus.org/flatten-maven-plugin/</url>
 
@@ -64,10 +62,10 @@
       <id>rfscholte</id>
       <name>Robert Scholte</name>
       <email>rfscholte@apache.org</email>
-      <timezone>Europe/Amsterdam</timezone>
       <roles>
         <role>developer</role>
       </roles>
+      <timezone>Europe/Amsterdam</timezone>
     </developer>
     <developer>
       <id>khmarbaise</id>
@@ -80,10 +78,10 @@
       <id>sjaranowski</id>
       <name>Slawomir Jaranowski</name>
       <email>sjaranowski@apache.org</email>
-      <timezone>Europe/Warsaw</timezone>
       <roles>
         <role>developer</role>
       </roles>
+      <timezone>Europe/Warsaw</timezone>
     </developer>
   </developers>
 
@@ -124,12 +122,13 @@
   <scm>
     <connection>scm:git:https://github.com/mojohaus/flatten-maven-plugin.git</connection>
     <developerConnection>scm:git:ssh://git@github.com/mojohaus/flatten-maven-plugin.git</developerConnection>
-    <url>https://github.com/mojohaus/flatten-maven-plugin/tree/master</url>
     <tag>HEAD</tag>
+    <url>https://github.com/mojohaus/flatten-maven-plugin/tree/master</url>
   </scm>
 
   <properties>
     <mavenVersion>3.2.5</mavenVersion>
+    <recommendedJavaBuildVersion>11</recommendedJavaBuildVersion>
     <project.build.outputTimestamp>2022-08-16T21:49:15Z</project.build.outputTimestamp>
   </properties>
 
@@ -227,6 +226,9 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-checkstyle-plugin</artifactId>
+        <configuration>
+          <configLocation>${checkstyle.spotless.config}</configLocation>
+        </configuration>
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
@@ -242,7 +244,6 @@
     </plugins>
   </build>
 
-
   <reporting>
     <plugins>
       <plugin>
@@ -259,22 +260,27 @@
   </reporting>
 
   <profiles>
+    <profile>
+      <id>java11+</id>
+      <activation>
+        <jdk>[11,)</jdk>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>com.diffplug.spotless</groupId>
+            <artifactId>spotless-maven-plugin</artifactId>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
     <profile>
       <id>run-its</id>
       <build>
         <plugins>
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-invoker-plugin</artifactId>
-            <executions>
-              <execution>
-                <goals>
-                  <goal>install</goal>
-                  <goal>integration-test</goal>
-                  <goal>verify</goal>
-                </goals>
-              </execution>
-            </executions>
             <configuration>
               <debug>true</debug>
               <cloneProjectsTo>${project.build.directory}/it</cloneProjectsTo>
@@ -293,19 +299,20 @@
               <postBuildHookScript>verify</postBuildHookScript>
               <preBuildHookScript>setup</preBuildHookScript>
             </configuration>
-          </plugin>
-
-          <plugin>
-            <groupId>org.codehaus.mojo</groupId>
-            <artifactId>mrm-maven-plugin</artifactId>
             <executions>
               <execution>
                 <goals>
-                  <goal>start</goal>
-                  <goal>stop</goal>
+                  <goal>install</goal>
+                  <goal>integration-test</goal>
+                  <goal>verify</goal>
                 </goals>
               </execution>
             </executions>
+          </plugin>
+
+          <plugin>
+            <groupId>org.codehaus.mojo</groupId>
+            <artifactId>mrm-maven-plugin</artifactId>
             <configuration>
               <propertyName>repository.proxy.url</propertyName>
               <repositories>
@@ -318,6 +325,14 @@
                 <proxyRepo />
               </repositories>
             </configuration>
+            <executions>
+              <execution>
+                <goals>
+                  <goal>start</goal>
+                  <goal>stop</goal>
+                </goals>
+              </execution>
+            </executions>
           </plugin>
         </plugins>
       </build>

src/main/java/org/codehaus/mojo/flatten/AbstractFlattenMojo.java

@@ -1,81 +1,74 @@
-package org.codehaus.mojo.flatten;
-
-/*
- * Licensed to the Apache Software Foundation (ASF) under one
- * or more contributor license agreements.  See the NOTICE file
- * distributed with this work for additional information
- * regarding copyright ownership.  The ASF licenses this file
- * to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance
- * with the License.  You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing,
- * software distributed under the License is distributed on an
- * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
- * KIND, either express or implied.  See the License for the
- * specific language governing permissions and limitations
- * under the License.
- */
-
-import java.io.File;
-
-import org.apache.maven.plugin.AbstractMojo;
-import org.apache.maven.plugins.annotations.Parameter;
-
-/**
- * This is the abstract base class for {@link AbstractMojo MOJOs} that realize the different goals of this plugin.
- *
- * @author Joerg Hohwiller (hohwille at users.sourceforge.net)
- */
-public abstract class AbstractFlattenMojo
-    extends AbstractMojo
-{
-
-    /**
-     * The directory where the generated flattened POM file will be written to.
-     */
-    @Parameter( defaultValue = "${project.basedir}" )
-    private File outputDirectory;
-
-    /**
-     * The filename of the generated flattened POM file.
-     */
-    @Parameter( property = "flattenedPomFilename", defaultValue = ".flattened-pom.xml" )
-    private String flattenedPomFilename;
-
-    /**
-     * The constructor.
-     */
-    public AbstractFlattenMojo()
-    {
-
-        super();
-    }
-
-    /**
-     * @return the filename of the generated flattened POM file.
-     */
-    public String getFlattenedPomFilename()
-    {
-        return this.flattenedPomFilename;
-    }
-
-    /**
-     * @return the directory where the generated flattened POM file will be written to.
-     */
-    public File getOutputDirectory()
-    {
-        return this.outputDirectory;
-    }
-
-    /**
-     * @return a {@link File} instance pointing to the flattened POM.
-     */
-    protected File getFlattenedPomFile()
-    {
-        return new File( getOutputDirectory(), getFlattenedPomFilename() );
-    }
-
-}
+package org.codehaus.mojo.flatten;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.File;
+
+import org.apache.maven.plugin.AbstractMojo;
+import org.apache.maven.plugins.annotations.Parameter;
+
+/**
+ * This is the abstract base class for {@link AbstractMojo MOJOs} that realize the different goals of this plugin.
+ *
+ * @author Joerg Hohwiller (hohwille at users.sourceforge.net)
+ */
+public abstract class AbstractFlattenMojo extends AbstractMojo {
+
+    /**
+     * The directory where the generated flattened POM file will be written to.
+     */
+    @Parameter(defaultValue = "${project.basedir}")
+    private File outputDirectory;
+
+    /**
+     * The filename of the generated flattened POM file.
+     */
+    @Parameter(property = "flattenedPomFilename", defaultValue = ".flattened-pom.xml")
+    private String flattenedPomFilename;
+
+    /**
+     * The constructor.
+     */
+    public AbstractFlattenMojo() {
+
+        super();
+    }
+
+    /**
+     * @return the filename of the generated flattened POM file.
+     */
+    public String getFlattenedPomFilename() {
+        return this.flattenedPomFilename;
+    }
+
+    /**
+     * @return the directory where the generated flattened POM file will be written to.
+     */
+    public File getOutputDirectory() {
+        return this.outputDirectory;
+    }
+
+    /**
+     * @return a {@link File} instance pointing to the flattened POM.
+     */
+    protected File getFlattenedPomFile() {
+        return new File(getOutputDirectory(), getFlattenedPomFilename());
+    }
+}