AbortProcessingException leaves stack trace in server log, how to disable this? - jsf

Question

There is a commandButton on a page that asynchronously invokes some service, and when user clicks a button I want to verify service availability by checking special config from database. This config can be updated every minute. So if the service is not available, action of commandButton should not be executed.
So, as per Differences between action and actionListener, I'm checking service availability in actionListener and throw AbortProcessingException in case service is not available. So action will be skipped.
This works fine, but it leaves a stack trace in server's log. I don't want such behavior. Is it possible to handle the exception in such way that this will not leave mark in server logs, just like when ValidatorException is thrown? I'm using OmniFaces FullAjaxExceptionHandler, if that's relevant.

Answer 1

You can suppress the logging with a custom exception handler. As you're currently using OmniFaces FullAjaxExceptionHandler, you'd better extend it. In the handle() method, check if there's an exception and if it's an instance of AbortProcessingException. If so, then just ignore it and return directly from the exception handler.
public class YourExceptionHandler extends FullAjaxExceptionHandler {
public YourExceptionHandler(ExceptionHandler wrapped) {
super(wrapped);
}
#Override
public void handle() throws FacesException {
Iterator<ExceptionQueuedEvent> events = getUnhandledExceptionQueuedEvents().iterator();
if (events.hasNext() && events.next().getContext().getException() instanceof AbortProcessingException) {
return; // Ignore (and don't log).
}
super.handle(); // Continue to FullAjaxExceptionHandler.
}
}
Create a factory around it:
public class YourExceptionHandlerFactory extends ExceptionHandlerFactory {
private ExceptionHandlerFactory wrapped;
public YourExceptionHandlerFactory(ExceptionHandlerFactory wrapped) {
this.wrapped = wrapped;
}
#Override
public ExceptionHandler getExceptionHandler() {
return new YourExceptionHandler(getWrapped().getExceptionHandler());
}
#Override
public ExceptionHandlerFactory getWrapped() {
return wrapped;
}
}
In order to get this to run, register it as factory in faces-config.xml the usual way, replacing the FullAjaxExceptionHandlerFactory:
<factory>
<exception-handler-factory>com.example.YourExceptionHandlerFactory</exception-handler-factory>
</factory>