Class [org.springframework.beans.factory.xml.SimplePropertyNamespaceHandler] does not implement the NamespaceHandler interface

I am trying to deploy a web application in Geronimo 2.0 and I am getting following error: 20:03:39,543 ERROR [[/phaip]] StandardWrapper.Throwable java.lang.IllegalArgumentException: Class [org.springframework.beans.factory.xml.SimplePropertyNamespaceHandler] does not implement the

Re: Class [org.springframework.beans.factory.xml.SimplePropertyNamespaceHandler] does not implement the NamespaceHandler interface

I'd guess you are running into a spring version conflict. I would: 1. remove the dependencies from your plan that you don't need (this won't fix the problem but it should make it easier to look into by cutting the dependency list in half or less) 2. add a hidden-classes element to force