Peter,

>Hi,
>
>I ended up playing for about six hours today trying to get the ClassLoader 
>stuff working again today. There was a few issues. Namely that each time a 
>resource was accessed it would reload, scan and build a JarFile and so on 
>which was killing performance. There was also no way to specify permissions 
>and a whole bunch of other stuff. Also we really can't take over the 
>URL.setURLStreamHandlerFactory() because our hosted apps may want to use it. 
>
I though about a chaining concept.  That could work with 
URLStreamHandlerFactory if everyone follows the rules.

>So I started refactoring but really didn't come up with any ideas. I gotta 
>say that I HATE the way they did protocol handling in the JVM though ;)
>
Indeed.  Anything even vaugelly static sucks.  IoC rocks!

>Anyways there is only one thing that I haven't done yet that will probably 
>work. It is ugly but the only option I can see ;( (Well other than writing 
>our own ClassLoader which is probably heaps of work).
>
Have you seen : http://www.yagga.net/java/metajar/

Could we persuade the guy to donate to Apache if it's any good.  I think 
it uses a hook-class concept.

>Essentioally we have the code for the SarURLHandlerStream and friends in base 
>classloader and in the system search path for that sort of stuff. We then 
>have each thread store which current application it is dealing with and work 
>that way. A bit ugly and britlle but it should work.
>
Thread per SAR?  Hmmm, that's a bit smelly, but you're the boss.

Regards,

- Paul H


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