Getting the java.lang.reflect.Method from a ProceedingJoinPoint?

Question

The question is short and simple: Is there a way to get the Method object from an apsectj ProceedingJoinPoint?

Currently I am doing

Class[] parameterTypes = new Class[joinPoint.getArgs().length];
Object[] args = joinPoint.getArgs();
for(int i=0; i<args.length; i++) {
    if(args[i] != null) {
        parameterTypes[i] = args[i].getClass();
    }
    else {
        parameterTypes[i] = null;
    }
}

String methodName = joinPoint.getSignature().getName();
Method method = joinPoint.getSignature()
    .getDeclaringType().getMethod(methodName, parameterTypes);

but I don't think this is the way to go ...

Answer 1

Your method is not wrong, but there's a better one. You have to cast to MethodSignature

MethodSignature signature = (MethodSignature) joinPoint.getSignature();
Method method = signature.getMethod();

Answer 2

You should be careful because Method method = signature.getMethod() will return the method of the interface, you should add this to be sure to get the method of the implementation class:

    if (method.getDeclaringClass().isInterface()) {
        try {
            method= jointPoint.getTarget().getClass().getDeclaredMethod(jointPoint.getSignature().getName(),
                    method.getParameterTypes());
        } catch (final SecurityException exception) {
            //...
        } catch (final NoSuchMethodException exception) {
            //...                
        }
    }

(The code in catch is voluntary empty, you better add code to manage the exception)

With this you'll have the implementation if you want to access method or parameter annotations if this one are not in the interface