GWT RPC Exceptions

So... Most of GWT's documentation is pretty good, but the part about RPC exceptions is kind of lacking.

I found some posts such as:

http://groups.google.com/group/Google-Web-Toolkit/browse_thread/thread/c048700dcaee7b2a
http://astithas.blogspot.com/2007/08/case-of-disappeared-exception-message.html
http://blog.platinumsolutions.com/node/198


But all of them mentioned the now deprecated SerializableException. According to the API this was deprecated because Exception implements Serializable, and thus a normal exception should work fine... (http://google-web-toolkit.googlecode.com/svn/javadoc/1.5/com/google/gwt/user/client/rpc/SerializableException.html)

Unfortunately I was still getting the "the call failed on the server see server log for details" message from exceptions that reached the client.

Anyway, the solution I reached was very, very, simple. My ServiceImpl class throws a standard RuntimeException ("throw new RuntimeException("Epic Fail");"). But this is what I was already doing that didn't work. I had to add "throws Exception" to the method, and thus the client side service interface as well. Worked like a charm after that.


public interface SomeService extends RemoteService {
void doSomething(Object someObject) throws exception;
}

public interface SomeServiceAsync {
void doSomething(Object someObject, AsyncCallback callback);
}

public class SomeServiceImpl extends RemoteServiceServlet implements SomService {
public void doSomething(Object someObject) throws Exception {
if(epic.fail())
throw new RuntimeException("Epic Fail");
else
doSomethingCool();
}
}