public void clearCache(){
  ZipFile zipFile=_zipFileRef.getAndSet(null);
  if (zipFile != null)   try {
    zipFile.close();
  }
 catch (  Exception e) {
  }
}

public void clearCache ( ) { ZipFile zipFile = _zipFileRef . getAndSet ( null ) ; if ( zipFile != null ) try { zipFile . close ( ) ; } catch ( Exception e ) { } }
clears any cached jarfile .
