Struts2 classloader problem.

Hi all,
I'm working with struts2, jboss 5, spring and datanucleus. Everything was working good, but after I decided to use jca and deployed the datanucleus-jca.rar, I started getting the following error:

2010-05-17 16:04:18,168 ERROR [com.opensymphony.xwork2.util.classloader.ReloadingClassLoader] (main) Exception while trying to build the ResourceStore for URL [file://3j011-ebbsl5-g9bd7p0a-1-g9bd89fr-2c/]

java.lang.IllegalArgumentException: URI has an authority component

at java.io.File.<init>(File.java:368)

at com.opensymphony.xwork2.util.classloader.ReloadingClassLoader.<init>(ReloadingClassLoader.java:50)

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It looks like struts2 has some problem with the classloader. Has someone got any ideas?
Any suggestion would be really appreciated.
Please, let me know if you need some more info.

Thanks a lot,
Fabrizio