Re: gcj/283: GCJ fails to compile inner classes which extend another inner class

[idstewart at softhome dot net]

The following reply was made to PR gcj/283; it has been noted by GNATS.

From: idstewart@softhome.net
To: mark@klomp.org (Mark Wielaard)
Cc: java-gnats@sourceware.cygnus.com
Subject: Re: gcj/283: GCJ fails to compile inner classes which extend another inner class
Date: Sat, 15 Jul 2000 12:48:29 -0400 (EDT)

 On Sat Jul 15 06:51:51 2000 Mark Wielaard wrote:
 > 
 > Hi,
 > 
 > > > Note that in your example you try to extend InnerB from a non static
 > > > innerclass InnerA which is not legal. Making InnerA a public static class
 > > > would be a valid example.
 > > 
 > > That, unfortunately, is not an option.  I'm working on a clean-room 
 > > implementation of Swing.  Each of the core classes implement the Accessible 
 > > interface by returning an inner class which extends 
 > > JComponent.AccessibleJComponent, a protected abstract inner class.
 > 
 > I see what you are trying to do. You found (another) bug which is different
 > from gjc/256 (but which can only be shown when the gcj/256 patch is applied).
 > 
 > So to show this bug you have to not only extend the InnerA from InnerB
 > but also OuterB from OuterA:
 > 
 > public class OuterA {
 >     public class InnerA {
 >     }
 > }
 > 
 > public class OuterB extends OuterA {
 >     public class InnerB extends OuterA.InnerA {
 >     }
 > }
 > 
 > Now gcj will give the following error:
 > 
 > OuterB.java: In class `OuterB$InnerB':
 > OuterB.java: In method `<init>(OuterB)':
 > OuterB.java:4: No enclosing instance for inner class `OuterA$InnerA' is in scope; an explicit one must be provided when creating this inner class.
 > }
 > ^
 > 1 error
 > 
 > Which is wrong since OuterB is in scope and is an instance of OuterA.
 > 
 > Note that as Bryce noted you want to make sure that you don't have
 > any class files around since that gives yet another obscure error message.
 
 I'm compiling in the parent directory of javax, and sending the resulting 
 .class files to a seperate directory.
 
 example: gcj -C -I/usr/local/japhar/share/classpath -d /usr/local/japhar/share\
 /classpath javax/swing/JLayeredPane.java
 
 Is that what you mean?
 
 > P.S. Please CC java-gnats so your comments will make it into the bug database.
 
 Done.
 
 > P.P.S. Where can I find this Swing clean room implementation?
 > Are you going to merge it with Classpath/libgcj?
 
 Well, currently it resides only on my hard-drive.  I just accepted a position
 with the Maxim Group (I start July 31).  At somepoint after that I'll get the
 paperwork for FSF into RMS, and then add my source to the libgcj repository.
 
 I was kinda holding off, waiting for the Classpath implementation, but after 3
 months with no activity, figured it was time to put up or shutup... ;)
 
 
 Ian