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From Ian Boston <>
Subject Re: jetty and juel incompatibilities
Date Fri, 01 May 2009 17:42:58 GMT

On 1 May 2009, at 17:29, Brian Eaton wrote:

> On Fri, May 1, 2009 at 2:30 AM, Ian Boston <> wrote:
>> Have you tried setting the context classloader to the webapp  
>> classloader
>> around that method call ?
> I don't see a method call to fix, unfortunately.  This happens when
> jetty tries to compile a jsp, there is no shindig code in the stack
> until too late.
> I think this is the flow.  First:
> - jetty starts shindig with webapp class loader
> - shindig loads ExpressionFactory and ExpressionFactoryImpl with web
> app class loader
> Later:
> - jetty starts JSP compiler with context class loader (system class
> loader, maybe?)
> ***bug*** load ExpressionFactory with context class loader
> - switch to web app class loader
> - JSP compiler calls ExpressionFactory.newInstance
> - newInstance finds ExpressionFactoryImpl from web app class loader
> - then there's a cast to the wrong version of ExpressionFactory.class,
> and we die.
> If I'm right, I think we've found a jetty bug.  I might be wrong.  I
> haven't found the right version of the jetty code to step through to
> see what's going on.

Yes sounds like a bug with the jsp compiler.
What happens in Tomcat with the same glassfish el jar in shared ?
The fix from the earlier version might just have been due to no el jar  
in shared ?

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