I've tracked this down to a difference in URLClassLoader.getResources behaviour 
between Juno and Kepler, but only when running on the IBM JVM:

        https://bugs.eclipse.org/bugs/show_bug.cgi?id=408955#c21

Perhaps it's related to the change that went in recently to fix 
https://bugs.eclipse.org/bugs/show_bug.cgi?id=375783 ?

On 28 May 2013, at 08:41, Fred Bricon wrote:

> Hi,
> 
> it seems *something* broke m2e on the IBM JVM in Kepler. 
> *All* the m2e versions I tested (1.2.0 -> 1.4.0)  fail to start when run in 
> Kepler + IBM JVM (Java 7.0).
> The same m2e versions work fine with Juno + IBM JVM.
> The same m2e versions work fine with Kepler + Oracle JVM.
> 
> This issue prevents RC releases of EPP distros containing m2e (Java, Java EE) 
> [1].
> 
> Apparently the Guice Container doesn't load properly, but I have no idea why. 
> Anyone platform/equinox savvy has any idea of what might have caused the 
> regression?
> 
> [1] https://bugs.eclipse.org/bugs/show_bug.cgi?id=408955
> 
> Regards,
> 
> Fred Bricon
> 
> 
> -- 
> "Have you tried turning it off and on again" - The IT Crowd
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