The server-runtime modules has a dependency on infinispan-jboss-marshalling in order for the server to provide transcoding and jbmar on the server-side. However, the infinispan-server-testdriver-core does not exclude this dependency, resulting in all client tests automatically configuring the GenericJBossMarshaller . The default for tests should be the ProtoStreamMarshaller, however it should also be possible to configure other marshallers if required.