In the struts-config.xml file, add an exception
element to this action. You can also put it in the
global-exceptions section if more than one action will
utilize this exception handler.
Here's an example action mapping using an exception
element:
action
path=/signin
type=com.cavaness.beer4all.security.LoginAction
scope=request
name=loginForm
validate=true
input=/signin.jsp
exception
handler=com.foo.MyExceptionHandler
key=error.invalidlogin
path=/signin.jsp
scope=request
type=com.cavaness.beer4all.common.exceptions.InvalidLogi
nException/
forward name=Success path=/index.jsp
redirect=true/
forward name=Failure path=/signin.jsp/
/action
Notice the exception element. The handler attribute is
the fully-qualified class name of your handler. As you
have done, it must extend the default handler. The type
attribute specifes the fully-qualified exception class
for when you want to call this exception handler. You
can put java.lang.Exception if you want this handler
to process all exceptions thrown during this Action.
Hope that helps,
Chuck
I have a class that extents the default struts ExceptionHandler ( see below).
Now, when an exception occurs in the 'Action' class..., how do i make
sure that
the 'execute()' in 'MyExceptionHandler' is executed instaed of the
default ExceptionHandler?
public class MyExceptionHandler extends ExceptionHandler {
private MyChainedException tCE = null;=
/**
* Constructor for an external message
* @param tce of type MyChainedException
*
*/
public MyExceptionHandler(MyChainedException tce) {
this.tCE = tce;
}
public ActionForward execute(Exception ex,
ExceptionConfig config,
ActionMapping mapping,
ActionForm formInstance,
HttpServletRequest request,
HttpServletResponse response)
throws ServletException {
ActionForward forward = null;
ActionError error = null;
String property = null;
/* Get the path for the forward either from the exception element
* or from the input attribute.
*/
String path = null;
if (config.getPath() != null) {
path = config.getPath();
}else{
path = mapping.getInput();
}
// Construct the forward object
forward = new ActionForward(path);
/* Figure out what type of exception has been thrown. The Struts
* AppException is not being used in this example.
*/
if( tCE instanceof MyChainedException) {
// This is the specialized behavior
Throwable t = tCE.getCause();
String messageKey = t.getClass().getName();
error = new ActionError( messageKey );
}
// Store the ActionError into the proper scope
// The storeException method is defined in the parent class
storeException(request, property, error, forward, =
config.getScope());
return forward;
}
}
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