I had the same error on migration app form jboss 4 to 5.1.
In Jboss 5 there are many libs which is include within and cause conflict with libs from
your project folder. Either you try to delete libs from your project or if you need them
to compiling code, just copy the libs from your jboss folder into your project.
Futhermore there many modified configuration for different technology you use. So it could
be helpfull to tell which technology you use on your app (Spring, JFS...)
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