Re: [aspectj-users] Exception dilemma

[Wim Deblauwe <wim.deblauwe@xxxxxxxxx>]

Would it not be easier, if this is for testing only, to use JMock? You can say in JMock 'make this method throw this exception when I call it'.

regards,

Wim

2009/3/5 Oliver Böhm <boehm@xxxxxxxxxx>

Hi Thomas,

yes, that's exactly what I want - I tried your code and it works. I had a little problem to understand the code but I think the trick here is to use the constructor of the inner class to throw the desired exception.

What I don't understand is the $ sign before the method name ($throw) but I guess this is syntax for inner classes.

thanx for your tip
Oliver



Thomas Richard Darimont schrieb:

Hi Oliver,

so you want to throw an exception after some specific Methods return

How about this:
(Just a quick hack...)

Aspect:
[code]
package de.tutorials.training.aspects;

import java.io.IOException;

public aspect ExampleAspect {
  pointcut applicationCode(): execution(* *..*(..)) && ! within(ExampleAspect);
 //    after() throwing(Throwable t) : applicationCode(){
//    }
    after() returning: applicationCode(){
      Thrower.$throw(new IOException("oh oh"));
  }
    static class Thrower{
      private static Throwable throwable;
            private Thrower() throws Throwable{
          throw throwable;
      }
            public static void $throw(Throwable t){
          throwable = t;
          try {
              Thrower.class.newInstance();
          } catch (InstantiationException e) {
              e.printStackTrace();
          } catch (IllegalAccessException e) {
              e.printStackTrace();
          }
      }
            public static void $throw0(Throwable t){
          //Questionable but okay for "debugging" purposes
          Thread.currentThread().stop(t);
      }
  }
}
[/code]

Example:
[code]
package de.tutorials.training;

public class Main {
  public static void main(String[] args) throws Throwable {
      try {
          m0();
      } catch (Throwable t) {
          t.printStackTrace();
      }
            try {
          m1();
      } catch (Throwable t) {
          t.printStackTrace();
      }

      try {
          m2();
      } catch (Throwable t) {
          t.printStackTrace();
      }
  }

  public static void m0() {}
  public static int m1() { return 0; }
  public static void m2() throws Throwable {}
}
[/code]

Output:
[code]
java.io.IOException: oh oh
  at de.tutorials.training.aspects.ExampleAspect.ajc$afterReturning$de_tutorials_training_aspects_ExampleAspect$1$d15ea11e(ExampleAspect.aj:12)
  at de.tutorials.training.Main.m0(Main.java:29)
  at de.tutorials.training.Main.main(Main.java:10)
java.io.IOException: oh oh
  at de.tutorials.training.aspects.ExampleAspect.ajc$afterReturning$de_tutorials_training_aspects_ExampleAspect$1$d15ea11e(ExampleAspect.aj:12)
  at de.tutorials.training.Main.m1(Main.java:32)
  at de.tutorials.training.Main.main(Main.java:15)
java.io.IOException: oh oh
  at de.tutorials.training.aspects.ExampleAspect.ajc$afterReturning$de_tutorials_training_aspects_ExampleAspect$1$d15ea11e(ExampleAspect.aj:12)
  at de.tutorials.training.Main.m2(Main.java:37)
  at de.tutorials.training.Main.main(Main.java:20)
Exception in thread "main" java.io.IOException: oh oh
  at de.tutorials.training.aspects.ExampleAspect.ajc$afterReturning$de_tutorials_training_aspects_ExampleAspect$1$d15ea11e(ExampleAspect.aj:12)
  at de.tutorials.training.Main.main(Main.java:25)

[/code]

Best regards,
Thomas

Oliver Böhm schrieb:

Hallo,

for testing purpose I want to throw an Exception after a method returns:

   after() returning throws InterruptedException : applicationCode() {
       throw new InterruptedException();
   }

This works as expected for methods which throws InterruptedException. Now I want to make it more general and addresses *all* methods which can throw an checked exception:

   after() returning throws Exception : applicationCode() {
       ...
   }

But here I got an error message ("can't throw checked exception 'java.lang.Exception' at this join point...") which is clear because the pointcut "applicationCode()" addresses e.g. an InterruptException.

Has anybody a hint or tip how I can realize it without defining an advice for each possible checked Exception?

regards
Oliver
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--
Oliver Böhm
http://www.javatux.de

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