private void closeJar(String path){
  if (jarfiles.containsKey(path)) {
    JarHolder theJar=(JarHolder)jarfiles.get(path);
    theJar.close();
  }
}

private void closeJar ( String path ) { if ( jarfiles . containsKey ( path ) ) { JarHolder theJar = ( JarHolder ) jarfiles . get ( path ) ; theJar . close ( ) ; } }
closes a jar file and set its urlconnection to null .
