2013/10/29 Vaishampayan, Shailesh Arvind <svaishampa...@inautix.co.in>:
> ClientAction extends ActionSupport throws Exception{
>
> ....
>
> try{
>
> clientService.searchClient();
>
> }catch(InvalidClientSearchCriteriaException e){
>
> addActionMessage("Invlid Search Criteria");
>
> }
>
> ...
>
> And similar code in every action class. However i dont want to pollute my
> action classes with try catch blocks. Instead it would be much better if i
> can write on try catch block at one place and catch all the exceptions there
> as BusinessExceptions and create messages /errors from embedded
> messages/errors in those exceptions. One approach i could think of was to use
> interceptor or preresult listener. But I cannot use interceptor like below
> which catches BusinessExceptions thrown from action classes...
>
> ExceptionInterceptor extends AbstractInterceptor(ActionInvocation
> ivocation,...){
>
> try{
>
> invocation.invoke();
>
> }catch(Exception e){
>
> if(e instanceof BusinessException){
>
> ActionSupport as = (ActionSupport)invocation.getAction();
>
> String message = extractMessagefromException()//--custom
> method to extract message embedded in exception.
>
> as.addActionMessages(message);
>
> //-- above will not work result has already been rendered right? and
> hence it wouldn't matter if i add action messages now.
>
> }
>
> }
>
> }
>
> Second approach of using pre-result listener is to add action messages just
> like above in pre-result listener's method, as result is yet to be rendered
> and I can safely change that. However I am not sure if pre-result listener
> will ever execute, if exception is thrown in action ? And even if it does,
> how i can get the exception object thrown by the action ?
Result wasn't rendered yet but you must return some result from the
interceptor, e.g.:
try{
return invocation.invoke();
} catch (Exception) {
// handle BusinessException
return "success";
}
It just an example, you must adjust it to your needs.
Regards
--
Łukasz
+ 48 606 323 122 http://www.lenart.org.pl/
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