@Override public void addURL(URL url,boolean isScanned){
  if (containsURL(url)) {
    return;
  }
  super.addURL(url,isScanned);
  if (isScanned)   _pendingScanRoots.add(new ScanRoot(url,null));
}

@ Override public void addURL ( URL url , boolean isScanned ) { if ( containsURL ( url ) ) { return ; } super . addURL ( url , isScanned ) ; if ( isScanned ) _pendingScanRoots . add ( new ScanRoot ( url , null ) ) ; }
adds the url to the urlclassloader .
