src/main/java/org/apache/maven/plugins/linkcheck/SiteInvoker.java - maven-linkcheck-plugin - Git at Google

 package org.apache.maven.plugins.linkcheck;

 /*
  * 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 java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.PrintStream;
 import java.io.Reader;
 import java.io.UnsupportedEncodingException;
 import java.io.Writer;
 import java.util.ArrayList;

 import java.util.Collections;
 import java.util.List;
 import java.util.Properties;

 import org.apache.commons.lang.SystemUtils;
 import org.apache.maven.artifact.repository.ArtifactRepository;

 import org.apache.maven.model.Profile;
 import org.apache.maven.model.Reporting;
 import org.apache.maven.project.MavenProject;

 import org.apache.maven.plugin.logging.Log;
 import org.apache.maven.shared.invoker.DefaultInvocationRequest;
 import org.apache.maven.shared.invoker.DefaultInvoker;
 import org.apache.maven.shared.invoker.InvocationOutputHandler;
 import org.apache.maven.shared.invoker.InvocationRequest;
 import org.apache.maven.shared.invoker.InvocationResult;
 import org.apache.maven.shared.invoker.Invoker;
 import org.apache.maven.shared.invoker.MavenInvocationException;
 import org.apache.maven.shared.invoker.PrintStreamHandler;

 import org.codehaus.plexus.util.FileUtils;
 import org.codehaus.plexus.util.IOUtil;
 import org.codehaus.plexus.util.ReaderFactory;
 import org.codehaus.plexus.util.StringUtils;
 import org.codehaus.plexus.util.WriterFactory;
 import org.codehaus.plexus.util.cli.CommandLineUtils;

 /**
  * @author ltheussl
  * @since 1.1
  */
 public class SiteInvoker
 {
     private final ArtifactRepository localRepository;

     private final Log log;

     public SiteInvoker( ArtifactRepository localRepository, Log log )
     {
         this.localRepository = localRepository;
         this.log = log;
     }

     /**
      * Invoke Maven for the <code>site</code> phase for a temporary Maven project using
      * <code>tmpReportingOutputDirectory</code> as <code>${project.reporting.outputDirectory}</code>.
      * This is a workaround to be sure that all site files have been correctly generated. <br/>
      * <b>Note 1</b>: the Maven Home should be defined in the <code>maven.home</code> Java system property
      * or defined in <code>M2_HOME</code> system env variables.
      * <b>Note 2</be>: we can't use <code>siteOutputDirectory</code> param from site plugin because some plugins
      * <code>${project.reporting.outputDirectory}</code> in their conf.
      *
      * @param project the MavenProject to invoke the site on. Not null.
      * @param tmpReportingOutputDirectory not null
      * @throws IOException if any
      */
     public void invokeSite( MavenProject project, File tmpReportingOutputDirectory )
         throws IOException
     {
         String mavenHome = getMavenHome();
         if ( StringUtils.isEmpty( mavenHome ) )
         {
             // CHECKSTYLE_OFF: LineLength
             getLog().error( "Could NOT invoke Maven because no Maven Home is defined. "
                                 + "You need to set the M2_HOME system env variable or a 'maven.home' Java system property." );
             // CHECKSTYLE_ON: LineLength
             return;
         }

         // invoker site parameters
         List goals = Collections.singletonList( "site" );
         Properties properties = new Properties();
         properties.put( "linkcheck.skip", "true" ); // to stop recursion

         File invokerLog =
             FileUtils.createTempFile( "invoker-site-plugin", ".txt", new File( project.getBuild().getDirectory() ) );

         // clone project and set a new reporting output dir
         MavenProject clone;
         try
         {
             clone = (MavenProject) project.clone();
         }
         catch ( CloneNotSupportedException e )
         {
             IOException ioe = new IOException( "CloneNotSupportedException: " + e.getMessage() );
             ioe.setStackTrace( e.getStackTrace() );
             throw ioe;
         }

         // MLINKCHECK-1
         if ( clone.getOriginalModel().getReporting() == null )
         {
             clone.getOriginalModel().setReporting( new Reporting() );
         }

         clone.getOriginalModel().getReporting().setOutputDirectory( tmpReportingOutputDirectory.getAbsolutePath() );
         List profileIds = getActiveProfileIds( clone );

         // create the original model as tmp pom file for the invoker
         File tmpProjectFile = FileUtils.createTempFile( "pom", ".xml", project.getBasedir() );
         Writer writer = null;
         try
         {
             writer = WriterFactory.newXmlWriter( tmpProjectFile );
             clone.writeOriginalModel( writer );
             writer.close();
             writer = null;
         }
         finally
         {
             IOUtil.close( writer );
         }

         // invoke it
         try
         {
             invoke( tmpProjectFile, invokerLog, mavenHome, goals, profileIds, properties );
         }
         finally
         {
             if ( !getLog().isDebugEnabled() )
             {
                 tmpProjectFile.delete();
             }
         }
     }

     private static List getActiveProfileIds( MavenProject clone )
     {
         List profileIds = new ArrayList();

         for ( Object o : clone.getActiveProfiles() )
         {
             profileIds.add( ( (Profile) o ).getId() );
         }

         return profileIds;
     }

     /**
      * @param projectFile not null, should be in the ${project.basedir}
      * @param invokerLog not null
      * @param mavenHome not null
      * @param goals the list of goals
      * @param properties the properties for the invoker
      */
     private void invoke( File projectFile, File invokerLog, String mavenHome, List goals, List activeProfiles,
                          Properties properties )
     {
         Invoker invoker = new DefaultInvoker();
         invoker.setMavenHome( new File( mavenHome ) );
         File localRepoDir = new File( localRepository.getBasedir() );
         invoker.setLocalRepositoryDirectory( localRepoDir );

         InvocationRequest request = new DefaultInvocationRequest();
         request.setLocalRepositoryDirectory( localRepoDir );
         // request.setUserSettingsFile( settingsFile );
         request.setInteractive( false );
         request.setShowErrors( getLog().isErrorEnabled() );
         request.setDebug( getLog().isDebugEnabled() );
         // request.setShowVersion( false );
         request.setBaseDirectory( projectFile.getParentFile() );
         request.setPomFile( projectFile );
         request.setGoals( goals );
         request.setProperties( properties );
         request.setProfiles( activeProfiles );

         File javaHome = getJavaHome();
         if ( javaHome != null )
         {
             request.setJavaHome( javaHome );
         }

         InvocationResult invocationResult;
         try
         {
             if ( getLog().isDebugEnabled() )
             {
                 getLog().debug( "Invoking Maven for the goals: " + goals + " with properties=" + properties );
             }
             invocationResult = invoke( invoker, request, invokerLog, goals, properties, null );
         }
         catch ( MavenInvocationException e )
         {
             getLog().error( "Error when invoking Maven, consult the invoker log." );
             getLog().debug( e );
             return;
         }

         String invokerLogContent = null;
         Reader reader = null;
         try
         {
             reader = ReaderFactory.newReader( invokerLog, "UTF-8" );
             invokerLogContent = IOUtil.toString( reader );
             reader.close();
             reader = null;
         }
         catch ( IOException e )
         {
             getLog().error( "IOException: " + e.getMessage() );
             getLog().debug( e );
         }
         finally
         {
             IOUtil.close( reader );
         }

         if ( invokerLogContent != null && invokerLogContent.contains( "Error occurred during initialization of VM" ) )
         {
             getLog().info( "Error occurred during initialization of VM, try to use an empty MAVEN_OPTS." );

             if ( getLog().isDebugEnabled() )
             {
                 getLog().debug( "Reinvoking Maven for the goals: " + goals + " with an empty MAVEN_OPTS" );
             }

             try
             {
                 invocationResult = invoke( invoker, request, invokerLog, goals, properties, "" );
             }
             catch ( MavenInvocationException e )
             {
                 getLog().error( "Error when reinvoking Maven, consult the invoker log." );
                 getLog().debug( e );
                 return;
             }
         }

         if ( invocationResult.getExitCode() != 0 )
         {
             if ( getLog().isErrorEnabled() )
             {
                 getLog().error( "Error when invoking Maven, consult the invoker log file: "
                                     + invokerLog.getAbsolutePath() );
             }
         }
     }

     /**
      * @param invoker not null
      * @param request not null
      * @param invokerLog not null
      * @param goals the list of goals
      * @param properties the properties for the invoker
      * @param mavenOpts could be null
      * @return the invocation result
      * @throws MavenInvocationException if any
      */
     private InvocationResult invoke( Invoker invoker, InvocationRequest request, File invokerLog, List goals,
                                      Properties properties, String mavenOpts )
         throws MavenInvocationException
     {
         PrintStream ps;
         OutputStream os = null;
         if ( invokerLog != null )
         {
             if ( getLog().isDebugEnabled() )
             {
                 getLog().debug( "Using " + invokerLog.getAbsolutePath() + " to log the invoker" );
             }

             try
             {
                 if ( !invokerLog.exists() )
                 {
                     invokerLog.getParentFile().mkdirs();
                 }
                 os = new FileOutputStream( invokerLog );
                 ps = new PrintStream( os, true, "UTF-8" );
             }
             catch ( FileNotFoundException e )
             {
                 if ( getLog().isErrorEnabled() )
                 {
                     getLog().error( "FileNotFoundException: " + e.getMessage()
                                         + ". Using System.out to log the invoker." );
                 }
                 ps = System.out;
             }
             catch ( UnsupportedEncodingException e )
             {
                 if ( getLog().isErrorEnabled() )
                 {
                     getLog().error( "UnsupportedEncodingException: " + e.getMessage()
                                         + ". Using System.out to log the invoker." );
                 }
                 ps = System.out;
             }
         }
         else
         {
             getLog().debug( "Using System.out to log the invoker." );

             ps = System.out;
         }

         if ( mavenOpts != null )
         {
             request.setMavenOpts( mavenOpts );
         }

         InvocationOutputHandler outputHandler = new PrintStreamHandler( ps, false );
         request.setOutputHandler( outputHandler );
         request.setErrorHandler( outputHandler );

         outputHandler.consumeLine( "Invoking Maven for the goals: " + goals + " with properties=" + properties );
         outputHandler.consumeLine( "" );
         outputHandler.consumeLine( "M2_HOME=" + getMavenHome() );
         outputHandler.consumeLine( "MAVEN_OPTS=" + getMavenOpts() );
         outputHandler.consumeLine( "JAVA_HOME=" + getJavaHome() );
         outputHandler.consumeLine( "JAVA_OPTS=" + getJavaOpts() );
         outputHandler.consumeLine( "" );

         try
         {
             return invoker.execute( request );
         }
         finally
         {
             IOUtil.close( os );
             ps = null;
         }
     }

     /**
      * @return the Maven home defined in the <code>maven.home</code> system property or defined
      *         in <code>M2_HOME</code> system env variables or null if never setted.
      * @see #invoke(Invoker, InvocationRequest, File, List, Properties, String)
      */
     private String getMavenHome()
     {
         String mavenHome = System.getProperty( "maven.home" );
         if ( mavenHome == null )
         {
             try
             {
                 mavenHome = CommandLineUtils.getSystemEnvVars().getProperty( "M2_HOME" );
             }
             catch ( IOException e )
             {
                 getLog().error( "IOException: " + e.getMessage() );
                 getLog().debug( e );
             }
         }

         File m2Home = new File( mavenHome );
         if ( !m2Home.exists() )
         {
             getLog().error( "Cannot find Maven application directory. Either specify \'maven.home\' "
                                 + "system property, or M2_HOME environment variable." );
         }

         return mavenHome;
     }

     /**
      * @return the <code>MAVEN_OPTS</code> env variable value or null if not setted.
      * @see #invoke(Invoker, InvocationRequest, File, List, Properties, String)
      */
     private String getMavenOpts()
     {
         String mavenOpts = null;
         try
         {
             mavenOpts = CommandLineUtils.getSystemEnvVars().getProperty( "MAVEN_OPTS" );
         }
         catch ( IOException e )
         {
             getLog().error( "IOException: " + e.getMessage() );
             getLog().debug( e );
         }

         return mavenOpts;
     }

     /**
      * @return the <code>JAVA_HOME</code> from System.getProperty( "java.home" )
      *         By default, <code>System.getProperty( "java.home" ) = JRE_HOME</code> and <code>JRE_HOME</code> should be
      *         in the <code>JDK_HOME</code> or null if not setted.
      * @see #invoke(Invoker, InvocationRequest, File, List, Properties, String)
      */
     private File getJavaHome()
     {
         File javaHome;
         if ( SystemUtils.IS_OS_MAC_OSX )
         {
             javaHome = SystemUtils.getJavaHome();
         }
         else
         {
             javaHome = new File( SystemUtils.getJavaHome(), ".." );
         }

         if ( javaHome == null || !javaHome.exists() )
         {
             try
             {
                 javaHome = new File( CommandLineUtils.getSystemEnvVars().getProperty( "JAVA_HOME" ) );
             }
             catch ( IOException e )
             {
                 getLog().error( "IOException: " + e.getMessage() );
                 getLog().debug( e );
             }
         }

         if ( javaHome == null || !javaHome.exists() )
         {
             getLog().error( "Cannot find Java application directory. Either specify \'java.home\' "
                                 + "system property, or JAVA_HOME environment variable." );
         }

         return javaHome;
     }

     /**
      * @return the <code>JAVA_OPTS</code> env variable value or null if not setted.
      * @see #invoke(Invoker, InvocationRequest, File, List, Properties, String)
      */
     private String getJavaOpts()
     {
         String javaOpts = null;
         try
         {
             javaOpts = CommandLineUtils.getSystemEnvVars().getProperty( "JAVA_OPTS" );
         }
         catch ( IOException e )
         {
             getLog().error( "IOException: " + e.getMessage() );
             getLog().debug( e );
         }

         return javaOpts;
     }

     private Log getLog()
     {
         return log;
     }
 }
	package org.apache.maven.plugins.linkcheck;

	/*
	* 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 java.io.FileNotFoundException;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.OutputStream;
	import java.io.PrintStream;
	import java.io.Reader;
	import java.io.UnsupportedEncodingException;
	import java.io.Writer;
	import java.util.ArrayList;

	import java.util.Collections;
	import java.util.List;
	import java.util.Properties;

	import org.apache.commons.lang.SystemUtils;
	import org.apache.maven.artifact.repository.ArtifactRepository;

	import org.apache.maven.model.Profile;
	import org.apache.maven.model.Reporting;
	import org.apache.maven.project.MavenProject;

	import org.apache.maven.plugin.logging.Log;
	import org.apache.maven.shared.invoker.DefaultInvocationRequest;
	import org.apache.maven.shared.invoker.DefaultInvoker;
	import org.apache.maven.shared.invoker.InvocationOutputHandler;
	import org.apache.maven.shared.invoker.InvocationRequest;
	import org.apache.maven.shared.invoker.InvocationResult;
	import org.apache.maven.shared.invoker.Invoker;
	import org.apache.maven.shared.invoker.MavenInvocationException;
	import org.apache.maven.shared.invoker.PrintStreamHandler;

	import org.codehaus.plexus.util.FileUtils;
	import org.codehaus.plexus.util.IOUtil;
	import org.codehaus.plexus.util.ReaderFactory;
	import org.codehaus.plexus.util.StringUtils;
	import org.codehaus.plexus.util.WriterFactory;
	import org.codehaus.plexus.util.cli.CommandLineUtils;

	/**
	* @author ltheussl
	* @since 1.1
	*/
	public class SiteInvoker
	{
	private final ArtifactRepository localRepository;

	private final Log log;

	public SiteInvoker( ArtifactRepository localRepository, Log log )
	{
	this.localRepository = localRepository;
	this.log = log;
	}

	/**
	* Invoke Maven for the <code>site</code> phase for a temporary Maven project using
	* <code>tmpReportingOutputDirectory</code> as <code>${project.reporting.outputDirectory}</code>.
	* This is a workaround to be sure that all site files have been correctly generated. <br/>
	* <b>Note 1</b>: the Maven Home should be defined in the <code>maven.home</code> Java system property
	* or defined in <code>M2_HOME</code> system env variables.
	* <b>Note 2</be>: we can't use <code>siteOutputDirectory</code> param from site plugin because some plugins
	* <code>${project.reporting.outputDirectory}</code> in their conf.
	*
	* @param project the MavenProject to invoke the site on. Not null.
	* @param tmpReportingOutputDirectory not null
	* @throws IOException if any
	*/
	public void invokeSite( MavenProject project, File tmpReportingOutputDirectory )
	throws IOException
	{
	String mavenHome = getMavenHome();
	if ( StringUtils.isEmpty( mavenHome ) )
	{
	// CHECKSTYLE_OFF: LineLength
	getLog().error( "Could NOT invoke Maven because no Maven Home is defined. "
	+ "You need to set the M2_HOME system env variable or a 'maven.home' Java system property." );
	// CHECKSTYLE_ON: LineLength
	return;
	}

	// invoker site parameters
	List goals = Collections.singletonList( "site" );
	Properties properties = new Properties();
	properties.put( "linkcheck.skip", "true" ); // to stop recursion

	File invokerLog =
	FileUtils.createTempFile( "invoker-site-plugin", ".txt", new File( project.getBuild().getDirectory() ) );

	// clone project and set a new reporting output dir
	MavenProject clone;
	try
	{
	clone = (MavenProject) project.clone();
	}
	catch ( CloneNotSupportedException e )
	{
	IOException ioe = new IOException( "CloneNotSupportedException: " + e.getMessage() );
	ioe.setStackTrace( e.getStackTrace() );
	throw ioe;
	}

	// MLINKCHECK-1
	if ( clone.getOriginalModel().getReporting() == null )
	{
	clone.getOriginalModel().setReporting( new Reporting() );
	}

	clone.getOriginalModel().getReporting().setOutputDirectory( tmpReportingOutputDirectory.getAbsolutePath() );
	List profileIds = getActiveProfileIds( clone );

	// create the original model as tmp pom file for the invoker
	File tmpProjectFile = FileUtils.createTempFile( "pom", ".xml", project.getBasedir() );
	Writer writer = null;
	try
	{
	writer = WriterFactory.newXmlWriter( tmpProjectFile );
	clone.writeOriginalModel( writer );
	writer.close();
	writer = null;
	}
	finally
	{
	IOUtil.close( writer );
	}

	// invoke it
	try
	{
	invoke( tmpProjectFile, invokerLog, mavenHome, goals, profileIds, properties );
	}
	finally
	{
	if ( !getLog().isDebugEnabled() )
	{
	tmpProjectFile.delete();
	}
	}
	}

	private static List getActiveProfileIds( MavenProject clone )
	{
	List profileIds = new ArrayList();

	for ( Object o : clone.getActiveProfiles() )
	{
	profileIds.add( ( (Profile) o ).getId() );
	}

	return profileIds;
	}

	/**
	* @param projectFile not null, should be in the ${project.basedir}
	* @param invokerLog not null
	* @param mavenHome not null
	* @param goals the list of goals
	* @param properties the properties for the invoker
	*/
	private void invoke( File projectFile, File invokerLog, String mavenHome, List goals, List activeProfiles,
	Properties properties )
	{
	Invoker invoker = new DefaultInvoker();
	invoker.setMavenHome( new File( mavenHome ) );
	File localRepoDir = new File( localRepository.getBasedir() );
	invoker.setLocalRepositoryDirectory( localRepoDir );

	InvocationRequest request = new DefaultInvocationRequest();
	request.setLocalRepositoryDirectory( localRepoDir );
	// request.setUserSettingsFile( settingsFile );
	request.setInteractive( false );
	request.setShowErrors( getLog().isErrorEnabled() );
	request.setDebug( getLog().isDebugEnabled() );
	// request.setShowVersion( false );
	request.setBaseDirectory( projectFile.getParentFile() );
	request.setPomFile( projectFile );
	request.setGoals( goals );
	request.setProperties( properties );
	request.setProfiles( activeProfiles );

	File javaHome = getJavaHome();
	if ( javaHome != null )
	{
	request.setJavaHome( javaHome );
	}

	InvocationResult invocationResult;
	try
	{
	if ( getLog().isDebugEnabled() )
	{
	getLog().debug( "Invoking Maven for the goals: " + goals + " with properties=" + properties );
	}
	invocationResult = invoke( invoker, request, invokerLog, goals, properties, null );
	}
	catch ( MavenInvocationException e )
	{
	getLog().error( "Error when invoking Maven, consult the invoker log." );
	getLog().debug( e );
	return;
	}

	String invokerLogContent = null;
	Reader reader = null;
	try
	{
	reader = ReaderFactory.newReader( invokerLog, "UTF-8" );
	invokerLogContent = IOUtil.toString( reader );
	reader.close();
	reader = null;
	}
	catch ( IOException e )
	{
	getLog().error( "IOException: " + e.getMessage() );
	getLog().debug( e );
	}
	finally
	{
	IOUtil.close( reader );
	}

	if ( invokerLogContent != null && invokerLogContent.contains( "Error occurred during initialization of VM" ) )
	{
	getLog().info( "Error occurred during initialization of VM, try to use an empty MAVEN_OPTS." );

	if ( getLog().isDebugEnabled() )
	{
	getLog().debug( "Reinvoking Maven for the goals: " + goals + " with an empty MAVEN_OPTS" );
	}

	try
	{
	invocationResult = invoke( invoker, request, invokerLog, goals, properties, "" );
	}
	catch ( MavenInvocationException e )
	{
	getLog().error( "Error when reinvoking Maven, consult the invoker log." );
	getLog().debug( e );
	return;
	}
	}

	if ( invocationResult.getExitCode() != 0 )
	{
	if ( getLog().isErrorEnabled() )
	{
	getLog().error( "Error when invoking Maven, consult the invoker log file: "
	+ invokerLog.getAbsolutePath() );
	}
	}
	}

	/**
	* @param invoker not null
	* @param request not null
	* @param invokerLog not null
	* @param goals the list of goals
	* @param properties the properties for the invoker
	* @param mavenOpts could be null
	* @return the invocation result
	* @throws MavenInvocationException if any
	*/
	private InvocationResult invoke( Invoker invoker, InvocationRequest request, File invokerLog, List goals,
	Properties properties, String mavenOpts )
	throws MavenInvocationException
	{
	PrintStream ps;
	OutputStream os = null;
	if ( invokerLog != null )
	{
	if ( getLog().isDebugEnabled() )
	{
	getLog().debug( "Using " + invokerLog.getAbsolutePath() + " to log the invoker" );
	}

	try
	{
	if ( !invokerLog.exists() )
	{
	invokerLog.getParentFile().mkdirs();
	}
	os = new FileOutputStream( invokerLog );
	ps = new PrintStream( os, true, "UTF-8" );
	}
	catch ( FileNotFoundException e )
	{
	if ( getLog().isErrorEnabled() )
	{
	getLog().error( "FileNotFoundException: " + e.getMessage()
	+ ". Using System.out to log the invoker." );
	}
	ps = System.out;
	}
	catch ( UnsupportedEncodingException e )
	{
	if ( getLog().isErrorEnabled() )
	{
	getLog().error( "UnsupportedEncodingException: " + e.getMessage()
	+ ". Using System.out to log the invoker." );
	}
	ps = System.out;
	}
	}
	else
	{
	getLog().debug( "Using System.out to log the invoker." );

	ps = System.out;
	}

	if ( mavenOpts != null )
	{
	request.setMavenOpts( mavenOpts );
	}

	InvocationOutputHandler outputHandler = new PrintStreamHandler( ps, false );
	request.setOutputHandler( outputHandler );
	request.setErrorHandler( outputHandler );

	outputHandler.consumeLine( "Invoking Maven for the goals: " + goals + " with properties=" + properties );
	outputHandler.consumeLine( "" );
	outputHandler.consumeLine( "M2_HOME=" + getMavenHome() );
	outputHandler.consumeLine( "MAVEN_OPTS=" + getMavenOpts() );
	outputHandler.consumeLine( "JAVA_HOME=" + getJavaHome() );
	outputHandler.consumeLine( "JAVA_OPTS=" + getJavaOpts() );
	outputHandler.consumeLine( "" );

	try
	{
	return invoker.execute( request );
	}
	finally
	{
	IOUtil.close( os );
	ps = null;
	}
	}

	/**
	* @return the Maven home defined in the <code>maven.home</code> system property or defined
	* in <code>M2_HOME</code> system env variables or null if never setted.
	* @see #invoke(Invoker, InvocationRequest, File, List, Properties, String)
	*/
	private String getMavenHome()
	{
	String mavenHome = System.getProperty( "maven.home" );
	if ( mavenHome == null )
	{
	try
	{
	mavenHome = CommandLineUtils.getSystemEnvVars().getProperty( "M2_HOME" );
	}
	catch ( IOException e )
	{
	getLog().error( "IOException: " + e.getMessage() );
	getLog().debug( e );
	}
	}

	File m2Home = new File( mavenHome );
	if ( !m2Home.exists() )
	{
	getLog().error( "Cannot find Maven application directory. Either specify \'maven.home\' "
	+ "system property, or M2_HOME environment variable." );
	}

	return mavenHome;
	}

	/**
	* @return the <code>MAVEN_OPTS</code> env variable value or null if not setted.
	* @see #invoke(Invoker, InvocationRequest, File, List, Properties, String)
	*/
	private String getMavenOpts()
	{
	String mavenOpts = null;
	try
	{
	mavenOpts = CommandLineUtils.getSystemEnvVars().getProperty( "MAVEN_OPTS" );
	}
	catch ( IOException e )
	{
	getLog().error( "IOException: " + e.getMessage() );
	getLog().debug( e );
	}

	return mavenOpts;
	}

	/**
	* @return the <code>JAVA_HOME</code> from System.getProperty( "java.home" )
	* By default, <code>System.getProperty( "java.home" ) = JRE_HOME</code> and <code>JRE_HOME</code> should be
	* in the <code>JDK_HOME</code> or null if not setted.
	* @see #invoke(Invoker, InvocationRequest, File, List, Properties, String)
	*/
	private File getJavaHome()
	{
	File javaHome;
	if ( SystemUtils.IS_OS_MAC_OSX )
	{
	javaHome = SystemUtils.getJavaHome();
	}
	else
	{
	javaHome = new File( SystemUtils.getJavaHome(), ".." );
	}

	if ( javaHome == null \|\| !javaHome.exists() )
	{
	try
	{
	javaHome = new File( CommandLineUtils.getSystemEnvVars().getProperty( "JAVA_HOME" ) );
	}
	catch ( IOException e )
	{
	getLog().error( "IOException: " + e.getMessage() );
	getLog().debug( e );
	}
	}

	if ( javaHome == null \|\| !javaHome.exists() )
	{
	getLog().error( "Cannot find Java application directory. Either specify \'java.home\' "
	+ "system property, or JAVA_HOME environment variable." );
	}

	return javaHome;
	}

	/**
	* @return the <code>JAVA_OPTS</code> env variable value or null if not setted.
	* @see #invoke(Invoker, InvocationRequest, File, List, Properties, String)
	*/
	private String getJavaOpts()
	{
	String javaOpts = null;
	try
	{
	javaOpts = CommandLineUtils.getSystemEnvVars().getProperty( "JAVA_OPTS" );
	}
	catch ( IOException e )
	{
	getLog().error( "IOException: " + e.getMessage() );
	getLog().debug( e );
	}

	return javaOpts;
	}

	private Log getLog()
	{
	return log;
	}
	}