(resent without attachment)
Hi,
Found another issue. When you the run [1] on JDK 7u1 (java -cp test.zip
pkg1.Base) you get:
A.foo
A.foo
A.foo
A.foo
B.foo
C.foo
C.foo
Exception in thread "main" java.lang.NullPointerException
at pkg3.B.invoke(B.java:10)
at pkg1.Base.main(Base.java:20)
Note that pkg3/B.class has class file version 50, the other classes are all 51.
Regards,
Jeroen
[1] http://www.frijters.net/test-20111019.zip
> -----Original Message-----
> From: [email protected] [mailto:jvm-
> [email protected]] On Behalf Of Jeroen Frijters
> Sent: Wednesday, October 19, 2011 13:55
> To: [email protected]
> Subject: RE: [jvm-l] Package protected and virtual/non-virtual dispatch
>
> John Rose wrote:
> > Alex Buckley has been diligently tracking this and dozens of other
> > small defects in previous versions of the spec. The results can be
> > seen in the Java SE 7 Edition of the JVM Specification. This is in
> > JSR 336's Final Release (Annex 3) and at
> > http://download.oracle.com/javase/cmn/spec_index.html. It has a
> > modest little section called "5.4.5 Method overriding", which
> > documents the behavior you are asking about.
>
> Thanks for the link.
>
> Maybe I'm misunderstanding what it says, but I'm thoroughly confused by
> HotSpot behavior:
>
> package p1;
> class Z { public void foo() { } }
>
> package p2;
> class A extends Z { void foo() { } }
>
> package p3;
> class C extends A { void foo() { } }
>
> Here A.foo clearly overrides Z.foo and according to my understand of
> 5.4.5 C.foo should not override A.foo.
>
> Now the weird part, on HotSpot when C has class file version 51 C.foo
> does override A.foo, but for earlier class file versions it doesn't.
>
> It looks to me as if the spec documents the pre-7 HotSpot behavior.
>
> Regards,
> Jeroen
>
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