Grails and Spring AOP

Hi,

I am desperately trying to make Spring AOP work in my Grails project. I define
an advice on a service method, which works fine, but as soon as the pointcut
matches and the advice is executed, Grails throws an exception:

"java.lang.IllegalArgumentException: object is not an instance of declaring
class"

I guess this has something to do with Groovy and meta objects? Not sure.

Since I have seen Graeme saying on this mailing list that Spring AOP works just
fine in Grails, I am wondering what I am doing wrong.

Thanks,
Matthias

PS:
Here is my resources.xml, it's just for testing purposes right now (MyAspect is
annotated with @Aspect and defines a public method "foo"):

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans 
            http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
       http://www.springframework.org/schema/aop 
            http://www.springframework.org/schema/aop/spring-aop-2.5.xsd">          
             
    <aop:config>
       
      <aop:aspect id="theAspect" ref="testAspect">
   
        <aop:pointcut id="exec"
              expression="execution(* org.myapp.services.MyService.*(..))" />
             
        <aop:before pointcut-ref="exec" method="foo" />
       
      </aop:aspect>
   
    </aop:config>
   
    <bean id="testAspect" class="org.myapp.MyAspect">
    </bean>
   
</beans>


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