How to pass exception from Server to Client side in GWT RPC

Question

I am creating a RPC call using Async method in GWT. I have to check if there is any error on my Server side. Can I catch the exceptions of the server side on the Client side in GWT RPC?

Answer 1

The exceptions have to be declared in a throws clause in your RemoteService interface's methods, and have to be serializable by GWT-RPC under the same conditions as any other transported class.

You'll receive the exception in your AsyncCallback's onFailure. See also the javadoc for AsyncCallback.

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EDIT: actually, it happens that I just said the same thing that the doc already says: http://www.gwtproject.org/doc/latest/DevGuideServerCommunication.html#DevGuideHandlingExceptions

Answer 2

Yes, you can. Just make sure that your exception implements Serializable:

public class LoginException extends Exception implements Serializable {

    public LoginException() {
    }
}