[aspectj-users] About AspectJ pointcut

[Kawtip Nippon <kawtip@xxxxxxxxx>]

Dear all,
 
     I'd like to ask about AspectJ pointcut. From this quotation from aspectj tutorials...
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When matching method-execution join points, if the execution pointcut method signature specifies a declaring type, the pointcut will only match methods declared in that type, or methods that override methods declared in or inherited by that type. So the pointcut
  execution(public void Middle.*()) 
picks out all method executions for public methods returning void and having no arguments that are either declared in, or inherited by, Middle, even if those methods are overridden in a subclass of Middle. So the pointcut would pick out the method-execution join point for Sub.m() in this code:
  class Super {      protected void m() { ... }    }    class Middle extends
 Super {    }    class Sub extends Middle {      public void m() { ... }    }
--------------------------------
   I try to write some code to test. This is the code...
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class TestAccessModifiers {
 public void printA(){  System.out.println("A"); }}class Level2 extends TestAccessModifiers{ }class Level3 extends Level2{ public void printA(){  System.out.println("Level3 protected"); } public static void main(String[] args){  Level2 l2 = new Level2();  l2.printA();  Level3 l3 = new Level3();  l3.printA();  Level2 l22 = new Level3();  l22.printA(); }
}

aspect CallMethods {
 pointcut exeM(): execution(public void Level2.*());
 before(): exeM(){
  System.out.println(thisJoinPoint);
 }
 
}
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     and this is the result after i run the class (using ajdt with eclipse)
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A
execution(void p8.Level3.printA())
Level3 protected
execution(void p8.Level3.printA())
Level3 protected
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     I questioned that why the poincut can capture Level3.printA(). I thought that it can't capture this JoinPoint and it can capture this JoinPoint if the pointcut specify that execution(public void Level2+.*()) instead (+ should make the pointcut cover methods in Level3 class).
     And I wonder that why the pointcut can't capture a joinpoint l2.printA().
 
     Thank you very much in advance for you all,
Kawtip

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