code: @Override
      public void execute()
              throws MojoExecutionException
      {
          if ( skip )
          {
              getLog().info( "Skipping JAR unsigning for file: " + jarPath.getAbsolutePath() );
              return;
          }
          if ( jarPath.isDirectory() )
          {
              for ( File jar : jarPath.listFiles() )
              {
                  if ( JarSignerUtil.isZipFile( jar ) )
                  {
                      signTool.unsign( jar, verbose );
                  }
                  else
                  {
                      getLog().info( "Skipping JAR unsigning for file: " + jar.getAbsolutePath() );
                  }
              }
          }
          else
          {
              signTool.unsign( this.jarPath, verbose );
          }
      }
docs: ----------------------------------------------------------------------