code: public void clearPages(ClassLoader cl) {
  	Iterator<PageSource> it = this.pageSources.values().iterator();
  	PageSourceImpl entry;
  	while (it.hasNext()) {
  	    entry = (PageSourceImpl) it.next();
  	    if (cl != null) entry.clear(cl);
  	    else entry.clear();
  	}
      }
docs: remove all Page from Pool using this classloader
  
  @param cl