Re: Managed Bean can't catch checked exception

[Bill Dudney]

This is really weird Matt.
There is nothing that I know of that would be causing your code not to  
catch the exception. Are you getting the DataIntegrityException?

Also have you steped it through the debugger?
TTFN,
-bd-
On Nov 29, 2004, at 9:00 AM, Matt Raible wrote:
I'm experiencing a strange issue.  I am calling a Spring-managed bean  
from my managed-bean and for some reason, the bean won't catch a  
checked exception.  Here's the method that throws the exception:

   public void saveUser(User user) throws UserExistsException {
       try {
           dao.saveUser(user);
       } catch (DataIntegrityViolationException e) {
           throw new UserExistsException("User '" + user.getUsername()  
+
                                         "' already exists!");
       }
   }

In my bean I have:
       try {
           userManager.saveUser(user);
       } catch (UserExistsException ue) {
           log.warn(ue.getMessage());
           // for some reason - MyFaces doesn't seem to catch this  
exception
       } catch (DataIntegrityViolationException e) {
           log.warn(e.getMessage());
           addError("errors.existing.user",
                    new Object[] { user.getUsername(), user.getEmail()  
});

           return "editProfile";
       }
Is there some sort of rule that says "only catch Runtime Exceptions"?   
Also, is there anything in MyFaces/JSF for exception handling?   
Spring/Struts/WebWork all allow me to configure a specific page to go  
to when a particular exception is thrown.  I'd rather not do it in  
web.xml since I tend to use that for more generic exceptions.  Here's  
how I do it with Struts:

1.  struts-config.xml:
   <global-exceptions>
      <exception key="error.required"  
type="org.springframework.dao.DataAccessException"
                 path="/dataAccessFailure.jsp"/>
   </global-exceptions>

2.  dataAccessFailure.jsp:
<%@ include file="/taglibs.jsp" %>
<h3>Data Access Failure</h3>
<p>
   <c:out  
value="${requestScope['org.apache.struts.action.EXCEPTION'].message}"/ 
>
</p>

<!--
<%
Exception ex = (Exception)  
request.getAttribute("org.apache.struts.action.EXCEPTION");
ex.printStackTrace(new java.io.PrintWriter(out));
%>
-->

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Thanks,
Matt