Description
If an extension is marked optional, if it's not loadable, CXF should continue as if the extension is not available. However, if the extension class itself is loadable, but something it requires at resolve time is not, an exception is thrown.
Example:
http://cxf.547215.n5.nabble.com/JavaToWS-throws-java-lang-NoClassDefFoundError-tt5729942.html