ADF Handling Unexpected Errors

Question

Hi All,
I have a question related to ADF exception handling.
Imagine a button on a ADF jspx page which has a binding to a Application Module method. If the AM method throws a Null Pointer Exception, the normal behavior we notice is that
error message is shown in a pop up to the user.
Our application requirements is that we need to redirect the user to a global error page with a message to contact help desk for any unexpected error.
My question is how to we redirect user to a error page if any unexpected errors occurs in Model project/AM instead of exposing the error to the client in a popup.

Answer 1

Hi Timo,
The link you gave was helpful.
I did the following:
1) We Created a Class that extends DCErrorHandlerImpl to handle the model exceptions. In the reportException, we check if the errors can be handled by app, if not we re throw the exception.
        throw (NullPointerException)e.getCause(); // Inside the report Exception Method..
2) The exception gets propagated to the Controller layer. We have  written a class that extends oracle.adf.view.rich.context.ExceptionHandler. Inside the exception handler class, we check if exception occurred in RENDER_RESPONSE phase, if yes, we do a java script redirect to error page. For any other phase, we rethrow the exception.
3) The exceptions that are re thrown from the ExceptionHandler class are propagated to the method exception handler defined in adfc-config.xml and finally user is redirected to a error page.
The above approach works fine for different scenarios.
But only in case of a bounded task flow running as a region, step 3 does not work fine.
After step2, we see the following in console and user see a java script popup. The exception does not get propagated to the method handler in the adfc-config.xml.
I did not really understand why the exception does not reach the method call activity in adfc.
<LifecycleImpl> <_handleException> ADF_FACES-60098:Faces lifecycle receives unhandled exceptions in phase INVOKE_APPLICATION 5