hello, additional information:
if you would like to handle exceptions which occurred during the "invoke application" phase, there's a simple solution: use an application action listener in addition: you can use aop to handle exceptions (e.g. have a look at the aop support of spring). regards, gerhard 2008/6/4 Kuhn, Harald <[EMAIL PROTECTED]>: > Hi, > > I struckled with the same problems (definition of JSF error pages in > web.xml). > On further debugging I realized that the problem lies in the postback > handling of JSF: > > Lets say a postback zu View a.xhtml causes any error in some backing > bean. > Then the flow is as followed: > > 1) JSF Lifecyle of view a.xhtml starts > 2) Exception is thrown (i.e. during InvokeApplication) > 3) if no JSF error handlers are defined this exception pops up to tomcat > (Servlet-API) error handling > 4) tomcat searches for error page in web.xml > 5) tomcat forwards to the error-page > 6) as the error page is also JSF, the JSF lifecycle for the error page > is started > 7) In Phase RestoreView JSF checks if it is a postback > As it is just a forward it is the same request as for 1) > Therefore there is a postback token on the request and the view > corresponding to this token is restored. > As this token is from the inital request/postback of view > a.xhtml, this view is restored. > 8) as the JSF lifecycle continoues with view a.xhtml the exception is > reached a second time > 9) as there are errors during error-handling, tomcat shows the standard > stacktrace. > > A solution that worked for our requirement is: > > a) Create a custom FACES-Servlet that implements interface > DelegatedFacesServlet and delegates to the original FacesServlet > b) Register this servlet in your web.xml > > The error handling works like this: > 1) Catch all exception in the service-Method of the servlet > 2) store the exception inside a session bean (or maybe page-flow is > sufficent as well) > 3) redirect to error page > 4) error page is loaded by browser and displays the stored exception > from session bean. > > In this solution the error page is loaded by the browser and therefore > it is an initial request and no postback any more. > > Hope this helps > > Harald > > > -----Original Message----- > From: haric [mailto:[EMAIL PROTECTED] > Sent: Tuesday, June 03, 2008 7:11 PM > To: [email protected] > Subject: Handling Server Errors > > > > I am trying to write my own exception handler as per the details at > http://wiki.apache.org/myfaces/Handling_Server_Errors > > I tried to override handleException(fc,ex) method as following > public void handleException(FacesContext fc, Exception ex) throws > Throwable > { > log.error("Exception occured...", ex); > if(ex is of sometype){ > NavigationHandler nh = > fc.getApplication().getNavigationHandler(); > nh.handleNavigation(fc, null, "exceptionNavigation"); > fc.renderResponse(); > } else { > throw ex; > } > } > > in web.xml > ---------- > <error-page> > <error-code>500</error-code> > <location>/errorDisplay.xhtml</location> > </error-page> > > navigation rule > -------------- > <navigation-rule> > <navigation-case> > <from-outcome>exceptionNavigation</from-outcome> > <to-view-id>/errorPages/errorHtml.html</to-view-id> > </navigation-case> > </navigation-rule> > > The handleException() method gets invoked but never redirects to > errorHtml.html for if case, and it also fails for else case. If I get > the > error 500 and as per web.xml it should redirect errorDisplay.xhtml > instead > it shows whole stack trace on the web page. > > The functionality I am looking is: > - Catch the exception in handleException() method > - log the error > - If error is certain type redirect to static html/jsf page using > navigation > handler > - else throw the exception > - handle 500/404 and other exceptions using web.xml error pages > configuration > - if possible populate a bean with error messages or add messages to > FacesContext and redirect a standard jsf file where we display > <h:messages> > > > I appreciate help on this. > -- > View this message in context: > http://www.nabble.com/Handling-Server-Errors-tp17628641p17628641.html > Sent from the MyFaces - Users mailing list archive at Nabble.com. > > -- http://www.irian.at Your JSF powerhouse - JSF Consulting, Development and Courses in English and German Professional Support for Apache MyFaces
