code: public void execute()
          throws MojoExecutionException, MojoFailureException
      {
          try
          {
              for ( String name : getModules() )
              {
                  File output = new File( getOutputDirectory(), readModule( name ).getPath() );
                  clean( output );
              }
              clean( new File( getOutputDirectory(), ".gwt-tmp" ) );
          }
          catch ( GwtModuleReaderException e )
          {
              throw new MojoExecutionException( e.getMessage(), e );
          }
      }
docs: {@inheritDoc}
  
  @see org.apache.maven.plugin.Mojo#execute()