RE: [aspectj-users] A strange NullPointerException

["Ron Bodkin" <rbodkin@xxxxxxxxxxxxxx>]

This is caused because the cflow stack operation executes before the aspect
instance field is initialized. If you changed to !cflow(within(Enforcer+) &&
adviceexecution()) it should work. You could probably even use
!staticinitialization(*), although in general it's desirable to limit cflow
tests to a given kind of join point and not capture all join points within a
type... 

-----Original Message-----
From: aspectj-users-bounces@xxxxxxxxxxx
[mailto:aspectj-users-bounces@xxxxxxxxxxx] On Behalf Of Manuel Menezes de
Sequeira
Sent: Wednesday, June 06, 2007 1:17 PM
To: aspectj-users@xxxxxxxxxxx
Subject: [aspectj-users] A strange NullPointerException

Hi all,

I ran into a problem which may be a compiler bug. The code below should 
reproduce the error. If class EnforcementApplier is removed and Enforcer 
is made concrete, no error occurs. If !cflow(within(Enforcer+)) is 
removed from the advice definition, again no error occurs. Any help 
would be appreciated.

Thanks a lot,

Manuel

A.java:

    package tests;

    public class A {
        void foo() {}
       
        public static void main(String[] args) {
            A a = new A();
            a.foo(); // line 8
        }
    }

Enforcer.aj:

    package tests;

    public abstract aspect Enforcer {
        before(): !cflow(within(Enforcer+)) && execution(!static * *(..)) {
        }
    }

EnforcementApplier.aj:

    package tests;

    import tests.Enforcer;

    public aspect EnforcementApplier extends Enforcer {
    }

Using "Eclipse SDK Version: 3.2.2 Build id: M20070212-1330" and "Eclipse 
AspectJ Development Tools Version: 1.4.0 Build id: 20060629124300 
AspectJ version: 1.5.2", the result is:

    Exception in thread "main" java.lang.NoClassDefFoundError:
    org/aspectj/lang/NoAspectBoundException
        at tests.A.foo(A.java)
        at tests.A.main(A.java:8)

Using "Eclipse SDK Version: 3.3.0 Build id: I20070323-1616" and "Eclipse 
AspectJ Development Tools xVersion: 1.5.0.200703300605 AspectJ version: 
1.5.4.200701151324", the result is:

    Exception in thread "main" java.lang.ExceptionInInitializerError
        at tests.A.foo(A.java:4)
        at tests.A.main(A.java:8)
    Caused by: java.lang.NullPointerException
        at tests.Enforcer.<clinit>(Enforcer.aj:1)
        ... 2 more

The result was the same after updating AJDT to "Eclipse AspectJ 
Development Tools Version: 1.5.0.200705301038 AspectJ version: 
1.5.4.200705211336"

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