Re: inner classes with fields names similar to outer class/method fields

[Andrew Cagney <cagney@redhat.com>]

Mark Wielaard wrote:
> Hi,
>
> The following bug cost me a while to track down. The fix is easy. But if
> you are not expecting this then you might be puzzled about it for a long
> time like I was.
>
> testSyscallRunning(frysk.proc.TestSyscallRunning)java.lang.NullPointerException
>    at frysk.proc.TestSyscallRunning$2.execute(TestRunner)
>
> The problem was that under some versions of the fc6 compiler this method
> was miscompiled (!), under f7 the compiler gets it right. The anonymous
> inner class that extends TaskEvent tries to refer to the final task
> field of the method it is in. But TaskEvent has a field called task
> itself. The TaskEvent.task field is never initialized and so stays null.
> By explicitly renaming the final field in the outer method and using
> that name in the inner class the reference is always correct (under
> either the fc6 or f7 compiler).
>   
Mark,

Can you be more specific?  Frysk's build system already has a check for 
what sounds like a very similar bug vis:

class foo {
{
   func1() {
     class Bar {}
  }
  func2() {
    class Bar {}
  }
}


Andrew