aspectj Problem

public aspect PersistenceAspect {


	/**
	 * Pointcut which executes on 
	 * 
	 *  * Methods with @Persistence annotation
	 *  * Subclasses of BaseService
	 */
	pointcut invoker(BaseService service) : execution (@Persistence * BaseService.*(..)) && target(service);

	/**
	 * Before advice
	 * 
	 */
	before(BaseService service) : invoker(service) {
		System.out.print("invoking persistence method");
	}
}