Execute checkstyle during build and apply recommended code format

pom.xml

@@ -142,6 +142,15 @@
     </dependency>
   </dependencies>
 
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-checkstyle-plugin</artifactId>
+      </plugin>
+    </plugins>
+  </build>
+
   <profiles>
     <profile>
       <id>run-its</id>

src/main/java/org/codehaus/mojo/tidy/CheckMojo.java

@@ -28,7 +28,7 @@
  * Checks that the <code>pom.xml</code> is tidy. Fails the build if <code>mvn tidy:pom</code> would
  * create a different <code>pom.xml</code> than the current one.
  */
-@Mojo( name = "check", defaultPhase = LifecyclePhase.VERIFY, threadSafe = true)
+@Mojo( name = "check", defaultPhase = LifecyclePhase.VERIFY, threadSafe = true )
 public class CheckMojo
     extends TidyMojo
 {

src/main/java/org/codehaus/mojo/tidy/TidyMojo.java

@@ -45,7 +45,7 @@ public abstract class TidyMojo
     /**
      * The Maven Project.
      */
-    @Parameter(defaultValue = "${project}", required = true, readonly = true)
+    @Parameter( defaultValue = "${project}", required = true, readonly = true )
     protected MavenProject project;
 
     /**

src/main/java/org/codehaus/mojo/tidy/task/EnsureOrderAndIndent.java

@@ -23,6 +23,7 @@
 import javax.xml.stream.XMLEventReader;
 import javax.xml.stream.XMLStreamException;
 import javax.xml.stream.events.XMLEvent;
+
 import java.util.ArrayList;
 import java.util.List;
 
@@ -59,7 +60,8 @@ class EnsureOrderAndIndent
         new SectionSorter( "build/extensions/extension", new NodeGroup( "groupId", "artifactId", "version" ) ),
         new SectionSorter( "/project/parent", new NodeGroup( "groupId", "artifactId", "version", "relativePath" ) ),
         new SectionSorter( "plugin", new NodeGroup( "groupId", "artifactId", "version" ) ),
-        new SectionSorter( "/project/distributionManagement/relocation", new NodeGroup( "groupId", "artifactId", "version" ) ) );
+        new SectionSorter( "/project/distributionManagement/relocation",
+                           new NodeGroup( "groupId", "artifactId", "version" ) ) );
 
     @Override
     public String tidyPom( String pom, Format format )
@@ -237,7 +239,8 @@ private String formatSection( XMLEventReader reader, String pom, Format format,
                         }
                         addTextIfNotEmpty( output, indent, getPrecedingText( pom, starts[i], ends ), format );
                         addTextIfNotEmpty( output, indent, pom.substring( starts[i], ends[i] ), format );
-                        firstGroupStarted = groupStarted = true;
+                        firstGroupStarted = true;
+                        groupStarted = true;
                     }
                     ++i;
                 }

src/test/java/org/codehaus/mojo/tidy/task/PomTidyFixesTest.java

@@ -29,28 +29,32 @@
 import org.junit.runners.Parameterized.Parameter;
 import org.junit.runners.Parameterized.Parameters;
 
-@RunWith(Parameterized.class)
-public class PomTidyFixesTest {
-
-	protected static final String PATH = "fixes/order-and-indent-start-element-of-scope/";
-
-	@Parameters(name = "{0}")
-	public static Iterable<String> tests() {
-		return asList(
-				"property-ending-with-plugin.pom.xml",
-				"property-ending-with-dependency.pom.xml"
-		);
-	}
-
-	@Parameter(0)
-	public String name;
-
-	@Test
-	public void shouldThrowNoError()
-			throws Exception {
-		final String pom = IOUtil.toString(getClass().getResourceAsStream(PATH + name));
-		String tidyPom = new PomTidy().tidy(pom);
-		assertEquals(pom, tidyPom, "nothing to tidy here");
-	}
+@RunWith( Parameterized.class )
+public class PomTidyFixesTest
+{
+
+    protected static final String PATH = "fixes/order-and-indent-start-element-of-scope/";
+
+    @Parameters( name = "{0}" )
+    public static Iterable<String> tests()
+    {
+        return asList(
+            "property-ending-with-plugin.pom.xml",
+            "property-ending-with-dependency.pom.xml"
+        );
+    }
+
+    @SuppressWarnings( "checkstyle:VisibilityModifier" )
+    @Parameter( 0 )
+    public String name;
+
+    @Test
+    public void shouldThrowNoError()
+        throws Exception
+    {
+        final String pom = IOUtil.toString( getClass().getResourceAsStream( PATH + name ) );
+        String tidyPom = new PomTidy().tidy( pom );
+        assertEquals( pom, tidyPom, "nothing to tidy here" );
+    }
 
 }

src/test/java/org/codehaus/mojo/tidy/task/PomTidyTest.java

@@ -44,6 +44,7 @@ public static Iterable<String> tests()
                        "pom-with-reporting", "project-single-line" );
     }
 
+    @SuppressWarnings( "checkstyle:VisibilityModifier" )
     @Parameter( 0 )
     public String name;