Re: inner class problem

There's a key difference between the inner classes in your examples. In your second (working) example the inner class is static as opposed to non-static in your first less working example. Instances of non-static inner classes gets a synthetic reference to the enclosing object when instantiated. Could your instrumentation miss something there?

/Arvid

On 9 dec 2010, at 17:33, Nikolas Nehmer <[email protected]> wrote:

> Hi all,
> 
> I have a problem regarding the following example:
> 
> public class Demo2 {
> 
>    InnerClass i;
>    int x;
> 
>    Demo2() {
>        i = new InnerClass();
>    }
> 
>    public static void main(String[] args) {
>        Demo2 demo = new Demo2();
>    }
> 
>    class InnerClass {
> 
>        InnerClass() {
>        }
>    }
> }
> 
> 
> My instrumentation adds some logging calls, i.e. in case of variable assignments like i = new InnerClass(); it calls a static logging facility. So far so good, but ins this special case, the inner class is just not instrumented. I'm using load-time instrumentation based on a Java agent. If I just add some debug System.out.printlns to the agent (instead of the instrumentation calls), either Demo2 and Demo2$InnerClass are passed to the agent. If I add the instrumentation, only the outer class is instrumented, the inner class is not even passed to the agent! Nevertheless the app is running - i.e. Demo2 is instantiated, the inner class is instantiated and for the outer class my logging calls are executed. The application terminates normally.
> To sumarize:
> - The instrumented app runs without exception!
> - For the outer class the instrumentation works! i.e. for i = new InnerClass(); a logging call is added
> - For the inner class there is NO call to the agent's transform(...) method!
> 
> Any ideas why the transform method might not be called for the inner class?
> 
> Btw. the following example works completely!!! The only difference is splitting up the example in two classes!
> 
> public class Demo {
>   public static void main(String[] args) {
>       MyComponent comp = new MyComponent();
>   }
> }
> 
> public class MyComponent {
>   InnerClass i;
> 
>   public MyComponent() {
>        i = new InnerClass();
>   }
> 
>   static class InnerClass {}
> }
> 
> 
> Best regards
> Nikolas
> 
> -- 
> Dipl.-Inf. Nikolas Nehmer,
> Dept. of Computer Science. University of Kaiserslautern
> P.O. Box 3049, 67653 Kaiserslautern, Germany.
> room 36/308, phone: +49 (0) 631 - 205 2644, fax: +49 (0) 631 - 205 3299
> mail: [email protected]
> 
> 
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