Showing Action Exception as Ajax Errors

[Alireza Fattahi <af...@yahoo.com>]

Hi,

We are using struts2 JSONValidationWithInterceptor. This interceptor grabs the errors from validation and convert them to json message
How can we have same feature! An interceptor which grabs the action exceptions and serialize them as json errors.

I try below interceptor. When an exception happens it works, when there are no errors and I should pass {} to response it is not working!
_______________________________________________

String target=Action.NONE;
        try {
             target=invocation.invoke();
             response.getWriter().print("{}");                
            response.setContentType("application/json");
             return target;
        }

        catch (BussinessException ex) {
            StringBuilder sb = new StringBuilder();
            sb.append("{ ");
            sb.append("\"errors\": [\"");
            sb.append("Bussiness Exception Happend");
            sb.append("\"]}");
            response.setContentType("application/json");
            response.getWriter().print(sb.toString());    
            return Action.NONE;
         
        }


 
~Regards,
~~Alireza Fattahi

Antwort: Showing Action Exception as Ajax Errors

[Christoph Nenning <Ch...@lex-com.net>]

> Hi,
> 
> We are using struts2 JSONValidationWithInterceptor. This interceptor
> grabs the errors from validation and convert them to json message
> How can we have same feature! An interceptor which grabs the action 
> exceptions and serialize them as json errors.
> 
> I try below interceptor. When an exception happens it works, when 
> there are no errors and I should pass {} to response it is not working!
> _______________________________________________
> 
> String target=Action.NONE;
>         try {
>              target=invocation.invoke();
>              response.getWriter().print("{}");                
>             response.setContentType("application/json");
>              return target;
>         }
> 

invocation.invoke() does these things:
- execute remaining interceptors
- execute action
- execute result (e.g. rendering a JSP)
- execute remaining interceptors again (what they do after 
invocation.invoke())


So, when no exception is thrown the response has already been created and 
the lines
  response.getWriter().print("{}");
  response.setContentType("application/json");
have no effect.


You can try to change the action to return Action.NONE

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