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From "Shailesh Arvind Vaishampayan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (WW-4234) Ability to catch service layer exceptions at one place and allow adding action messages/errors before results are rendered
Date Sat, 26 Oct 2013 17:14:30 GMT
Shailesh Arvind Vaishampayan created WW-4234:
------------------------------------------------

             Summary: Ability to catch service layer exceptions at one place and allow adding
action messages/errors before results are rendered
                 Key: WW-4234
                 URL: https://issues.apache.org/jira/browse/WW-4234
             Project: Struts 2
          Issue Type: New Feature
    Affects Versions: 2.3.15.3
            Reporter: Shailesh Arvind Vaishampayan


I am working with an application involoving Struts2 in web layer and Spring in business layer.
I also have BusinessException class which will be used by all business services to create
business related validation failures which must go up to web layer and should be show to users
as validation message. I can easily do this by writing in my Action class:

      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 preResultListener. But I cannot use interceptor like below which catches business
exceptions 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 actoinmessages now.
           }
         }                                               
   } 
Second approach of of preResultListener is to add action messages just like above in preResultListener's
method as result is yet to be rendered and i can safely change that. However not sure if preResultListener
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.?
There has to be something out of the box so that actions are not cluttered with try-catch
blocks




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