Sean,
Please send us the trace or a test program.
- Chien Yang
Java 3D Team.
> Date: Fri, 12 Jul 2002 11:57:39 -0700
> From: Sean Sylvis <[EMAIL PROTECTED]>
> Subject: Re: [JAVA3D] BranchGroups
> To: [EMAIL PROTECTED]
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> Comments: To: Chien Yang <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
>
> When I then call Group.setChild(), a null pointer exception is thrown because
there are no children in the Group.
> So, I'm pretty sure it is the same "bug" Justin was referring to. (See
Justin's response to previous email)
>
> Sean
>
>
> > -----Original Message-----
> > From: Chien Yang [mailto:[EMAIL PROTECTED]]
> > Sent: Friday, July 12, 2002 11:09 AM
> > To: Sean Sylvis; [EMAIL PROTECTED]; [EMAIL PROTECTED]
> > Subject: Re: [JAVA3D] BranchGroups
> >
> >
> > Justin,
> > I reread Sean's email and it seems to be a totally
> > different problem.
> > Sean's question is on Group.numChildren() :
> >
> > *********** Sean's email **********
> >
> > What happens when BranchGroup.addChild(null) is called?
> >
> > I was hoping to use the 'null' as a placeholder that I could
> > replace later with
> > a call to setChild(), but the addition of 'null' to the
> > BranchGroup child list
> > seems transient. Immediately after adding the right number of
> > 'null's to a
> > BranchGroup (to get the number of children correct for
> > replacement later), the
> > method numChildren() reports the correct number of children.
> > However, when
> > numChildren() is later (in another method) called on this
> > same BranchGroup, the
> > value returned is zero.
> >
> > Any ideas?
> >
> > ***********************************
> >
> > and yours is on NPE with setChild(). I've just tried
> > addChild(null) and
> > it went thro. with no NPE. Can you please verify it ?
> >
> > thanks,
> >
> > - Chien Yang.
> > Java 3D Team.
> >
> >
> >
> > > Date: Fri, 12 Jul 2002 10:27:25 -0700
> > > From: Justin Couch <[EMAIL PROTECTED]>
> > > Subject: Re: [JAVA3D] BranchGroups
> > > To: [EMAIL PROTECTED]
> > > MIME-version: 1.0
> > > Content-transfer-encoding: 7bit
> > > X-Accept-Language: en-us, en
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> > > User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US;
> > rv:1.0.0)
> > Gecko/20020530
> > >
> > > Chien Yang wrote:
> > > > Sean and Justin,
> > > >
> > > > I'm a little confuse on whether the NPE is on
> > addChild() or
> > > > setChild(). We did fix a bug reported by Justin in j3d1.3beta2 :
> > > >
> > > > BugId 4633672 : Group.setChild() may throw NullPointerException.
> > >
> > > Hmmm.. That's interesting because I thought I reported it on the
> > > addChild() not setChild(). Oh well, I could be wrong on
> > that. :( I had
> > > to remove the addChild() calls at the same time because it
> > is pointless
> > > having those when I can't setChild() as well so I may have missed a
> > > secondary bug there.
> > >
> > > Anyway, the basic process is that during the scene graph
> > the process is
> > > to addChild(null) as a placeholder for nodes that you want
> > to add later.
> > > Then, later on, you just do setChild(new_node_pointer, 0); The idea
> > > behind this is that it is one less capability bit to need
> > to switch on.
> > > Instead of needing both write and extend, you just need
> > write capabilities.
> > >
> > > --
> > > Justin Couch http://www.vlc.com.au/~justin/
> > > Java Architect & Bit Twiddler http://www.yumetech.com/
> > > Author, Java 3D FAQ Maintainer http://www.j3d.org/
> > > -------------------------------------------------------------------
> > > "Humanism is dead. Animals think, feel; so do machines now.
> > > Neither man nor woman is the measure of all things. Every organism
> > > processes data according to its domain, its environment; you, with
> > > all your brains, would be useless in a mouse's universe..."
> > > - Greg Bear, Slant
> > > -------------------------------------------------------------------
> > >
> > >
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> >
> >
>
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