[jboss-user] [JBoss Seam] - Re: Exception handling with interceptors

[jteb]

I've been using Interceptors for this kind of work. However one can only define EJB3 interceptors at the class level.

What I do is a workaround, which I find rather nasty, but since I haven't thought of another way yet and this works, I'll point it out.

I define an annotation which has Interceptors defined on it, with targets TYPE and METHOD. I put it on the class where I want a method to be intercepted and put it on the method(s) to be intercepted inside that class as well.

In the aroundInvoke, I do a check on that same annotation being present on the calling method. Something like the following:


  |   @AroundInvoke
  |   public Object aroundInvoke(InvocationContext ctx) {
  |     Object result = null;
  |     if(ctx.getMethod().getAnnotation(SomeAnnotation.class) != null) {
  |       try {
  |         result = ....
  |         // The rest of your code  
  |       }
  |       catch( ... ) {
  |       }
  |     }
  |     return result;
  |   }
  | 

Might not be the most elegant method, but it works for me.

I hope that helps you!

Regards,
Jan

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