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From David Jencks <>
Subject Re: EAR can't find WEB-INF/classes or WEB-INF/lib
Date Wed, 28 May 2008 06:46:43 GMT

On May 27, 2008, at 7:32 PM, Andrew Thorburn wrote:

> Encountered another part of the problem:
> I can package the frontend stuff (that would normally be found in  
> WAR/WEB-INF/classes into a JAR, put that in EAR/lib, and everything  
> works. However, my boss doesn't like that.

Why not?  that's basically the only arrangement that will work....

It sounds a bit like the dependencies between the jars you are dealing  
with are somewhat mixed up.  In my experience when this kind of  
problem is straightened out everyone finds it much easier to make  
progress and makes fewer mistakes.
> But if I leave the classes in WAR/WEB-INF, then I get a "Class Not  
> Found" exception from one of the libs in EAR/lib, which is trying to  
> load, via reflection, one of the classes in the frontend. I  
> understand why that doesn't work, thanks to your explanation of the  
> classloader.
> Obviously, if I move the libs from EAR/lib to EAR/WAR/WEB-INF/lib,  
> then all is good. Except that my MDB can't find the libs anymore.  
> Bugger.
> This problem will occur if I duplicate the libs, yes? I'm reasonably  
> sure it did last time.

I'd expect so.
> Further, if I set "reverse-classloading" to true, then I'm bound to  
> get all sorts of problems, and if my MDB tries to access a static  
> method (say, getInstance() for a class where that pattern is used),  
> it will, essentially, call a *different* method to the one the  
> classes in the WAR would call, yes? And return a different object.  
> Not cool.

I think that would produce more problems that it would solve.
> Can't really go around moving things, as the logging class (that's  
> basically essential) is in the same package as the reflection-using  
> class.
> Any ideas here apart from "Don't use Reflection", and "Don't call  
> from libs to main"?
> Now, I think the solution I want is to have the libs able to access  
> the frontend (in WEB-INF), while at the same time being access  
> exactly the same libs from my MDB, and I don't think that's possible  
> in Geronimo?

Not at present.  We could add a "single classloader per ear" flag  
fairly easily but it probably won't get into a release for a month or  

I'd start by asking why you can't straighten out the dependencies.

david jencks

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