[aspectj-users] Modifying parameters in more than one aspect providing a

[Joel <java@xxxxxxxx>]

Hello list members,

I have two aspects each of which modify method arguments. When both
aspects are applied to the same method, I would expect execution of
the aspects to be chained and I would expect that the arguments
modified in the first aspect to be available to the second aspect via
joinPoint.getArgs(); However, it appears that each aspect gets only
the original arguments; the second aspect never sees the modified
values. I've contrived an example:

The test class:

public class AspectTest extends TestCase {
    @Moo
    private void foo(String boo, String foo) {
        System.out.println(boo + foo);
    }

    public void testAspect() {
        foo("You should", " never see this");
    }
}

The method foo() is advised by two aspects:

@Aspect
public class MooImpl {

    @Pointcut("execution(@Moo * *(..))")
    public void methodPointcut() {}

    @Around("methodPointcut()")
    public Object afterMethodInControllerClass(ProceedingJoinPoint
joinPoint) throws Throwable {
        System.out.println("MooImpl is being called");
        Object[] args = joinPoint.getArgs();
        args[0] = "don't";
        return joinPoint.proceed(args);
    }
}
and...

@Aspect
public class DoubleMooImpl {

    @Pointcut("execution(@Moo * *(..))")
    public void methodPointcut() {}

    @Around("methodPointcut()")
    public Object afterMethodInControllerClass(ProceedingJoinPoint
joinPoint) throws Throwable {
        System.out.println("DoubleMooImpl is being called");
        Object[] args = joinPoint.getArgs();
        args[1] = " run and hide";
        return joinPoint.proceed(args);
    }
}

I would expect the output to be:

MooImpl is being called
DoubleMooImpl is being called
don't run and hide
...but is:

MooImpl is being called
DoubleMooImpl is being called
You should run and hide

Am I using the correct approach to modify arguments via around advice?

Note I have asked this question on Stack Overflow. Interested peeps
can find it here:
http://stackoverflow.com/questions/12843998/modifying-parameters-in-more-than-one-aspect-providing-around-advice

Thanks for taking the time to read this!