Re: [aspectj-users] cflow(within(C)) vs (within(C) || cflowbelow(within(

[Adrian Powell <aspectj-users@xxxxxxxxxxxxxxxx>]

 Chi-Hua (and others),

Neat problems.  I've some simple ways to dodge the issue, but as I 
played with your code, I kept coming up with more and more weird behavior.

> aspect, TraceClass, and was hoping that the aspect would print out all
> the join points in SomeClass. 
The simple way to do this is to just use:
   pointcut pc : within(SomeClass);

> To avoid infinite recursion, in
> TraceClass I used "!cflow(within(Trace*))" as the pointcut. However, I
> was not getting any output.
If you want to avoid tracing the trace, the best way to do this is to 
just say "!within(TraceClass)".


Now for the fun.  If I replace your pointcut with :

   pointcut pc() : !cflowbelow(within(TraceClass))

Then I get:

java.lang.NoClassDefFoundError
   at test.SomeClass.<clinit>(SomeClass.java)
Exception in thread "main"

But if I just add "&& !within(TraceClass)" or "&& !within(SomeClass)" 
then oddly enough the problem goes away.  So what else is there?  
Mysterious.

To make matters even more fun, I changed the pointcut to be:

   pointcut pc() : cflow(within(Trace*));

and now when I run it, not only do I get the same output as above, but I 
get a dialog box appearing with the title "Java Virtual Machine 
Launcher" saying "Could not find the main class.  Program will exit."

Wowsers.  Anyone know what is going on?

------
package test;
public class SomeClass {
   public static void main(String[] args) {
   }
}
-----
package test;
public aspect TraceClass {
   pointcut pc() : cflow(within(Trace*));  // JVM dialog box error
   // pointcut pc() : !cflowbelow(within(TraceClass));  // 
ExceptionInInitializerError

   before () : pc() {
       System.out.println("-> " +
               thisJoinPointStaticPart.toString());
   }
}
-------

-adrian.