NPE in MethodTailInterceptor

[rythos]

"rythos" wrote:
Hey there,

I have a class which has had methods introduced on it. It also has some methods that are being advised. The methods that are being introduced are not affected by the advice. Now inside my advice I'm trying to deal with the new methods, and am having some issues.

Point p = ( Point ) inv.targetObject;
BoundPointInterface bp = ( BoundPointInterface ) inv.targetObject;

bp.add(..)

As soon as I call any method on the mixin class, I get the following NPE. The null object is the Method field in the MethodTailInterceptor. I've tried tracing where it's coming from, but I can't see where any null method could have been added. Any ideas?

Thanks,
Craig

java.lang.NullPointerException
at org.jboss.aop.ClassAdvisor$MethodTailInterceptor.invoke(ClassAdvisor.java:865)
at org.jboss.aop.Invocation.invokeNext(Invocation.java:61)
at org.jboss.aop.ClassAdvisor.invokeMethod(ClassAdvisor.java:729)
at org.jboss.aop.ClassAdvisor.invokeMethod(ClassAdvisor.java:705)
at bean.Point._added_m$0(Point.java)
at bean.Point.addPropertyChangeListener(Point.java)
at bean.jboss.BoundPointInterceptor.invoke(BoundPointInterceptor.java:43)
at org.jboss.aop.Invocation.invokeNext(Invocation.java:61)
at org.jboss.aop.ClassAdvisor.invokeMethod(ClassAdvisor.java:729)
at org.jboss.aop.ClassAdvisor.invokeMethod(ClassAdvisor.java:705)
at bean.Point._added_m$0(Point.java)
at bean.Point.setX(Point.java)
at bean.Point.bean$Point$setRectangular$WithoutAdvisement(Point.java:38)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.aop.ClassAdvisor$MethodTailInterceptor.invoke(ClassAdvisor.java:865)
at org.jboss.aop.Invocation.invokeNext(Invocation.java:61)
at org.jboss.aop.ClassAdvisor.invokeMethod(ClassAdvisor.java:729)
at org.jboss.aop.ClassAdvisor.invokeMethod(ClassAdvisor.java:705)
at bean.Point._added_m$0(Point.java)
at bean.Point.setRectangular(Point.java)
at bean.BeanRun.run(BeanRun.java:38)
at common.GenericRun.start(GenericRun.java:39)
at bean.jboss.Run.main(Run.java:19)

[rythos]

"rythos" wrote:
Found my problem. Forgot to add <mixin>...</mixin> inside the <introduction-pointcut> tags. Didn't notice them in the difference between the interface introduction example, and the mixin class example. Whoops!

[marc.fleury]

"marc fleury" wrote:
rythos,

if you ever get in the codebase let us know. We are always looking for talented contributors

[rythos]

What do you mean get in the codebase? I'm working on a project involving this product, and I'm happy to send someone important any bugs that I can track down during the creation of it. I just put them here cause someone else did ;)

[bill.burke]

If you are interested in contributing let me know. I'm starting to do some serious enhancements to AOP and wouldn't mind a helper :)

Bill

[marc.fleury]

yeah yeah yeah come and help come and help.

marcf

[rythos]

You guys are funny :) I'm on my last term of my comp sci degree which is proving to be quite painful on the homework (reason why I'm here so often). When I eventually come out of this ring of fire if I'm still interested I'll give you a shout. In the mean time I'll just keep pestering with my random problems.

[marc.fleury]

this is how we recruit.

ooommmm we see the eye in you.. oooommmm

nah bullshit, just code a ton and get the stuff working and you are in.

You say you are done soon huh? hmmmmmm

[bill.burke]

JBOss AOP is homework? Can you elaborate?

FYI, we're always looking for new help. Open Source is largely volunteer which is why we encourage anybody who has a clue. You're digging into code, you may have a clue ;)

bill

[rythos]

Well, when the prof says "Make it work", I say "How high?" ;) Which is why I started digging into code.

I'm going to send you an e-mail elaborating on my homework, as I've heard it's a touchy subject and I don't really want to start a forum flame war :) This message is mainly to let random readers know I didn't ignore you after this.