Unable to engage rampart at client side when using it as a classpath resource

I have a bug in which I cannot access rampart from the classpath. I'm using Axis2 for client webservices in a deployment environment, I can't access a repository/modules folder with the rampart.mar file as I can when running a test client from the command line. I've tried placing the rampart file directly on the classpath and in a modules folder on the classpath.

I try and engage rampart with contextWSStub._getServiceClient()..engageModule(new QName("rampart"));
but to no avail, at run time I get org.apache.axis2.AxisFault: Unable to engage module : rampart