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Error performing rpcRequest

Posts: 11
Android Eclipse IDE Java
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GWT: 2.4.0
SmartGWT: 2.4 (simple, not pro/EE - I'm just a hobbist).
Google Chrome: 17.0.963.46 (the latest version)

I have a ListGrid with custom DataSource (based on
On loading the page with this grid - it tries to fetch data.
It creates service, runs executeFetch and recieves an error.

ProjectInfo - just a simple object created for DataSource tesing (only long, String, Data). Service works with DB via ProjectInfoDao with HebarnateTemplate.
Tried to make it with gilead and without - doesn't matter.
Simple RPC service (just recieve a String from server) works fine.
"Extends", "implements", "web.xml", "appContext.xml" - are checked - everyting is done the same way as on simple (working) RPC service.

I saw in code examples that response have the following style:

And I have response (in Chrome):

1. How I can remove "__gwt_ObjectId: <id>" from response in Chrome Dev Mode?
2. (the most important) What's the reason of these errors? I can't find, why it raises this error on processing this RPC-call.
It is sorta covered in the JavaRanch Style Guide.
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