public  void close(JarFile jarFile) 
{
        URL urlRemoved = (URL) urlCache.remove(jarFile);
        if( urlRemoved != null) {
                fileCache.remove(urlRemoved);
        }
}

Callback method of the URLJarFileCloseController to indicate that the JarFile is close. This way we can remove the JarFile from the cache

 public JarFile get(URL url) throws IOException 
{
        return get(url, true);
}

 JarFile get(URL url,
    boolean useCaches) throws IOException 
{
        if (url.getProtocol().equalsIgnoreCase("file")) {
            // Deal with UNC pathnames specially. See 4180841
            String host = url.getHost();
            if (host != null && !host.equals("") &&
                !host.equalsIgnoreCase("localhost")) {
                url = new URL("file", "", "//" + host + url.getPath());
            }
        }
        JarFile result = null;
        JarFile local_result = null;
        if (useCaches) {
            synchronized (this) {
                result = getCachedJarFile(url);
            }
            if (result == null) {
                local_result = URLJarFile.getJarFile(url, this);
                synchronized (this) {
                    result = getCachedJarFile(url);
                    if (result == null) {
                        fileCache.put(url, local_result);
                        urlCache.put(local_result, url);
                        result = local_result;
                    } else {
                        if (local_result != null) {
                            local_result.close();
                        }
                    }
                }
            }
        } else {
            result = URLJarFile.getJarFile(url, this);
        }
        if (result == null)
            throw new FileNotFoundException(url.toString());
        return result;
}

 URLConnection getConnection(JarFile jarFile) throws IOException 
{
         
        URL u = (URL)urlCache.get(jarFile);
        if (u != null)
            return u.openConnection();
        return null;
}