[jboss-dev] Re: Classloading Gotcha in JDK6

[Jason T. Greene]

Ah yes, It would have been nice if that was included in the
compatibility section of the release notes. There is a good description
of their reasons in the evaluation section here:

http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4976356

-Jason

On Wed, 2007-06-13 at 16:19 -0600, Andrig T Miller wrote:
> Jason,
>      There was a bug raised on this with Sun, and it is as follows:
>         
> http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6434149
> 
> They are actually not going to fix this, but instead want you to use what you describe below.  We will have to change our code accordingly in AS 5 and anywhere else for that matter to support JDK 6.
> 
> Andy
> 
> On Wed, 2007-06-13 at 17:12 -0500, Jason T. Greene wrote: 
> > FYI,
> > 
> > There is an undocumented system property (besides the jvm source) in JDK
> > 5 and 6 called "sun.lang.ClassLoader.allowArraySyntax". The default
> > changed from true to false in JDK6. So what this means is that in JDK6,
> > unless you set that property to true, if you try and load a Java array
> > type using a classloader (e.g. "[[B") you will get a CNFE.
> > 
> > The compatible solution is to either interpret array types directly (not
> > hard), or to use the extended form of Class.forName(), which does
> > understand the array syntax:
> > 
> > Class clazz = Class.forName(className, false, loader);
> > 
> > http://jira.jboss.com/jira/browse/JBCOMMON-25
> > 
> Andrig (Andy) Miller
> VP of Engineering
> JBoss, a division of Red Hat
> 
> 
-- 
Jason T. Greene
Lead, POJO Cache
JBoss, a division of Red Hat