code: public void setWebxml( File descr )
          throws ArchiverException
      {
          deploymentDescriptor = descr;
          if ( !deploymentDescriptor.exists() )
          {
              throw new ArchiverException( "Deployment descriptor: " + deploymentDescriptor + " does not exist." );
          }
  
          addFile( descr, "WEB-INF" + File.separatorChar + "web.xml" );
      }
docs: set the deployment descriptor to use (WEB-INF/web.xml);
  required unless <tt>update=true</tt>