Also, please send a test case to [EMAIL PROTECTED], so we can
fix it if its our bug.
Doug Twilleager
Java 3D Team
> MIME-Version: 1.0
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> Subject: Re: [JAVA3D] Memory Leak in 1.2 alpha1 when adding and removing
objects?
> To: [EMAIL PROTECTED]
>
> > From: "John A. Tenney" <[EMAIL PROTECTED]>
> >
> > In my application, I need to create and delete objects fairly often. I
create
> > the objects as a BranchGroup, and when I want to delete them, I use the
> > detach() function. Everything seems to work, but memory consumption
> > continues to ramp and performance gets increasingly slow. Is there
> > something I need to do besides detach() to allow detached BranchGroups
> > to become garbage collected? I am quite sure that I don't keep
> > references to the detached BranchGroups myself, so I've done everything
> > I can do to enable garbage collection.
>
> Be sure that you are not keeping references to any part of the BranchGroup you
> want to get rid of, such as an Apppearance, Geometry etc. Similarly, make
sure
> you are not sharing any part of the BranchGroup with a BranchGroup you are
> continuing to use (again, sharing Appearances are a common problem here).
>
> Finally, you may find that breaking down the BranchGroup after the detach
helps
> the problem. Do this by walking the tree, nulling out the geometry and
> appearance for each Shape and nulling out the children of each group. Do this
> *after* you detach() so that you don't have to worry about cap bits.
>
> A tool like OptimizeIt can be used to see the erroneous references to the
> detached() BG. Print out the BG's address before you null the reference and
> then use OptimizeIt to see if that BG is still present after you GC. If it is,
> trace back the BG reference to it's root and look for the bad reference.
>
> Doug Gehringer
> Sun Microsystems
>
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