Hey everyone,
I am trying to determine the location where an exception is caught in
the client side of a bit of code.
With a little testing I have found that throwing an exception in a RPC
call will be caught by the onFailure clause of that specific call,
however, since I would like to use the exceptions higher up, it feels
like they should be caught by the try-catch-block around the actual
invocation.
The example code below should clarify what I mean. The remote method
test will simply throw an Exception when called.
...
// Setup
ExTestServiceAsync serviceProxy = (ExTestServiceAsync) GWT.create
(ExTestService.class);
((ServiceDefTarget)serviceProxy).setServiceEntryPoint
(GWT.getModuleBaseURL() + "ExTestService");
AsyncCallback<String> callback = new AsyncCallback<String>() {
public void onFailure (Throwable caught) {
GWT.log("RPC error", caught); // <-- This is what is triggered
and
what shows in the GWT log window.
}
public void onSuccess (String result) {
GWT.log("RPC Succes: ", null);
}
};
...
// Make the call
try {
serviceProxy.test(true, callback);
} catch (Exception e) {
GWT.log("Exception while attempting RPC.", null); <-- This is where I
would like the exception to be caught.
}
...
As you can see, the exception that is thrown is caught in the wrong
place IMHO. It feels like the onFailure should only fire when the RPC
mechanism has a problem (something that GWT should generate) and an
exception that is thrown by programmer code should be handled in the
catch block of the actual call.
I understand that this will most likely yield tons of problems with
the whole asynchronous thing (in fact I am sure one excludes the
other), but the actual call still needs to have a try-catch-block
which seems never to be called.
Am I making a fundamental flaw in my logic or is this an unresolved
issue?
Patrick
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