Hi Raphael
I don't think, xmlbeans-2.4.0.jar causes the problem - this one is newer than the one you need. I think problem comes from xbean-2.2.0.jar (located in <designer root>\configuration\org.eclipse.osgi\bundles\92\1\.cp\lib\axis2-1.3_patched).root>\plugins\ch.ivyteam.ivy.webservice.exec.axis2_5.0.8.201312240845.jar\lib\axis2-1.3_patched\).
xbean-2.2.0.jar is used for webservices (axis2). So, you can try to replace the jar with a newer version or remove it at all. renamed copy of xmlbeans-2.4.0.jar. But keep in mind, that you have to do the same on the ivy-server, when you deploy your project.
I don't know, what side effects you have to expect when doing something with this jar.
Be careful - things may break...