Re: Cause exceptions from action methods to generate messages

[Robert Parsons]

Awesome! Thanks, I will try that right away. Mathias Brökelmann wrote: It´s quite easy to change the handling for invoking action methods. Simply wrap existing ActionListener Implementation of processAction with an try and catch block: FacesContext context = FacesContext.getInstance(); final ActionListener actionListener = context.getApplication().getActionListener(); ActionListener wrappedActionListener = new ActionListener() { public void processAction(ActionEvent actionEvent) throws AbortProcessingException { try { actionListener.processAction(actionEvent); } catch(Throwable t) { // do generic action exception handling here } } } context.getApplication().setActionListener(wrappedActionListener); You can implement it in a javax.servlet.ServletContextListener.contextInitialized() method. and register the listener in your web.xml file. 2005/11/5, Mike Kienenberger <[EMAIL PROTECTED]>: It doesn't appear that there's an easy way to do this. The events are triggered from UIComponentBase.broadcast() which calls each event.processListener() method which calls ActionListener.processAction() which calls methodBinding.invoke(). Ideally, you'd want to specify a custom methodBinding.invoke() that wrapped the error for you. Facelets does things differently -- maybe there's a way to create alternate MethodBinding rules for ActionSources which create your subclass of MethodBinding rather than the default MethodBinding instances. You could try asking about that on the facelets mailing list. Another possiblity is to use aspect-oriented-programming (AOP) to intercept methodBinding.invoke(). However, I don't use AOP, so I can't tell you anything beyond that it appears to do what you need. On 11/5/05, Robert Parsons <[EMAIL PROTECTED]> wrote: Hi, thanks for the reply. the wording of my question was a little bit off. I was looking for an automatic way for Exceptions that were thrown in any action method to automatically be added as a message (instead of the horrible error screens i get from facelets at the moment). The only other option other than an automatic method would be to wrap a try-catch around all the code of every action I have and generate a message when an exception is caught. Sounds like that might have to be the way I do it. Thanks anyway, -Robert. Volker Weber wrote: Hi, you can add a Message to FacesContect. See: http://java.sun.com/j2ee/javaserverfaces/1.1_01/docs/api/javax/faces/context/FacesContext.html#addMessage(java.lang.String,%20javax.faces.application.FacesMessage) regards Volker Robert Parsons wrote: Hi, Is there an easy way to make exceptions thrown by action methods (on backing beans) to generate messages? Or would this only be possible by modifying the MyFaces code. Thanks heaps, -Robert -- Mathias