A lot of classes in the package org.apache.xbean.classloader use File.toURL() instead of File.toURI().toURL(). File.toURL() is deprecated and does not work on windows with pathnames containing spaces. If a pathname contains spaces then File.toURL() does not convert spaces correctly. Javadoc recommends to use File.toURI().toURL() instead.
I have a patched version where this is fixed for the full package org.apache.xbean.classloader.