Re: [aspectwerkz-user] Pointcut problem in dynamic weaving

Hi

Could you send me (privately) a test case or little application that
shows both problems
- for the verify error with the static initalization
- for the issue when hotdeploying an aspect that is using some cflow() pointcut

Usually you need to send:
- the main class
- the aspect
- the xml file
(and avoid having third parties dependancies so that I can replay it
as soon as I receive the code sample)

Thanks
Alex

On 7/8/05, Sebastien Vallon <[email protected]> wrote:
> 
> Hi everybody, 
> I have two problems with pointcut and dynamic weaving. I think both are
> related but I'll try to explain anyway.
> 
> In my application I defined a pointcut on a certain method: Pointcut
> workingMethod. Inside the around advice related to this pointcut I want to
> deploy an aspect I want to be executed immediately. Meaning my aspect was
> defined as @After("WorkingMethod"). But when I try to load this aspect
> dynamically I have this error message:
> 
> Exception in thread "main" java.lang.VerifyError: (class:
> core/C_1__1709278340_1090156494___AW_JoinPoint, method:
> aw$staticinitialization signature: ()V) Illegal constant pool index
>     at core.C.work(Unknown Source)
>     at Main.main(Unknown Source)
>     Result: 1
> 
> I suppose this error is due to the fact that at the time I try to load the
> dynamic aspect, the execution point is already in the method itself,
> preventing to add another aspect related to this method.
> 
> Am I right ? is there a solution to this problem ?
> 
> To overcome this problem I created an empty object with an empty method.
> This method is called in the around aspect. Here is the code I wrote:
> 
>     @Around("workingMethod")
>     public Object framework(JoinPoint joinPoint) throws Throwable {
> 
>         if( !deployed ){
>             hdlAfter = Deployer.deploy(aspects.TempAspect.class);
>         }else{
>             Deployer.undeploy(hdlAfter);
>         }
>         deployed = !deployed;
> 
>         
>         final Object result = joinPoint.proceed();
> 
>         
>         CallToAspect callTheAspect = new CallToAspect();
>         callTheAspect.callToAspect();
> 
>         
>         return result;
>     }
> 
> My dynamic aspects are now set to execute after the callToAspect() method.
> This works. However as I may have numerous dynamic aspects I need to
> identify the ones I want to execute. I was therefore thinking at adding a
> cflow() to my dynamic aspect pointcut. 
> It used to be @Expression("execution(void callToAspect())") but I would like
> it to be @Expression("execution(void callToAspect()) &&
> cflow(execution(core.C.work()))") for instance. I tested it in static mode
> and it works. The around aspect is considered as part of the cflow() of the
> method. But in dynamic mode it fails. Here is the exception:
> 
> Exception in thread "main" java.lang.NoClassDefFoundError:
> org/codehaus/aspectwerkz/cflow/Cflow_9800697
>     at
> framework.CallToAspect_1_541186724_2069866918___AW_JoinPoint.invoke(Unknown
> Source)
>     at framework.CallToAspect.callToAspect(Unknown Source)
>     at framework.Framework.framework(Unknown Source)
>     at
> core.Work_1_1525100228_3656070___AW_JoinPoint.proceed(Unknown
> Source)
>     at
> core.Work_1_1525100228_3656070___AW_JoinPoint.invoke(Unknown
> Source)
>     at core.Work.work(Unknown Source)
>     at core.A.foo(Unknown Source)
>     at Main.main(Unknown Source)
> 
> Does anyone have an idea to solve either one or both of this problems ?
> 
> Thanks,
> 
> Sebastien