extObjectInputStream(InputStream in) throws IOException, StreamCorruptedException 
{
        super(in);
}

 protected Class resolveClass(ObjectStreamClass v) throws IOException, ClassNotFoundException 
{
        try {
            /*
             * Calling the super.resolveClass() first
             * will let us pick up bug fixes in the super
             * class (e.g., 4171142).
             */
            return super.resolveClass(v);
        } catch (ClassNotFoundException cnfe) {
            /*
             * This is a workaround for bug 4224921.
             */
            ClassLoader loader = Thread.currentThread().getContextClassLoader();
            if (loader == null) {
                if (systemClassLoader == null) {
                    systemClassLoader = ClassLoader.getSystemClassLoader();
                }
                loader = systemClassLoader;
                if (loader == null) {
                    throw new ClassNotFoundException(v.getName());
                }
            }
            return Class.forName(v.getName(), false, loader);
        }
}