Your implementation on the server very likely throws a
NullPointerException. The message "Server Error:" is prefixed by the
DefaultExceptionHandler. You can replace the latter with a custom
version that logs all exceptions. Therefore you have to provide a
custom version of the RequestFactoryServlet. Here's an example:
public class CustomRequestFactoryServlet extends RequestFactoryServlet
{
static class LoquaciousExceptionHandler implements ExceptionHandler
{
private static final Logger LOG =
LoggerFactory.getLogger( LoquaciousExceptionHandler.class );
@Override
public ServerFailure createServerFailure( Throwable throwable ) {
LOG.error( "Server error", throwable );
return new ServerFailure( throwable.getMessage(),
throwable.getClass().getName(), null, true );
}
}
public CustomRequestFactoryServlet() {
super( new LoquaciousExceptionHandler() );
}
}
More information:
http://cleancodematters.wordpress.com/2011/05/29/improved-exceptionhandling-with-gwts-requestfactory/
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