Need more details. Which version of gwt are you using?
For gwt 1.7 I had to do this.
It is possible your problem is due to your failure to declare
typeargs.
Whenever you use your own serializable classes you have to @annotate
its structure in the comment section of the code to inform gwt
compiler about your datatype.
For example, to allow you to pass Hashmap<String, String> as
parameter, and expecting List<GameResult> to be returned, you have to
@annotate the following in your gwt java source.
/**
* @gwt.TypeArgs toServerData <java.util.HashMap
<java.lang.String,java.lang.String>>
* @gwt.TypeArgs <com.xxx.testapp.client.GameResult>
**/
public interface MyGame
{
List serviceResponse(
HashMap<String, String> toServerData);
}
For gwt 1.6, 1.7, a section of this document would describe use of
typeargs annotation.
http://code.google.com/webtoolkit/doc/1.6/DevGuideServerCommunication.html.
However, I am unable to locate the same documentation for gwt 2.0. Not
sure if it typeargs are still required. but you could try.
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