post complex objects to iframe

[Ilya Basin]

Hi. There's a GWT form with editable GXT grid. I need to display a JSP page based on the form data in a separate IFRAME.
I want to encode/decode the form data by means of GWT, and I want to send this data directly to the JSP page without caching it on server.

Here's the code to post the data to iframe:
<form method="POST" action="/mypage.jsp" target="myiframeid"> <input type="hidden" name="serializedString" value="...

to get encoded string:

public interface ISerializerService extends RemoteService {
    /** allow serialize all types */
    Map dummyMethod(Map param);
}
...
public static String toString(Object _object) throws SerializationException  {
    SerializationStreamFactory ssf = GWT.create(ISerializerService.class);
    SerializationStreamWriter streamWriter = ssf.createStreamWriter();
    streamWriter.writeObject(_object);
    return streamWriter.toString();
}

to deserialize

public Object toObject(String serializedString) throws SerializationException {
    RPCRequest req = RPC.decodeRequest(serializedString);
    return req.getParameters()[0];

Problems:

There's no documented way to create RPCRequest on client. You have to write service class and service method name to the SerializationStreamWriter, and this may fail in newer GWT versions

Instead of RPC.decodeRequest(), I could use ServerSerializationStreamReader.readObject(), but it's marked "For internal use only", so it's as bad as previous

GWT claims to support classes that implement both IsSerializable and Serializable, but to decode the latter, you need an instance of StandardSerializationPolicy. It can only be obtained from the instance of RemoteServiceServlet. It's all too complex.