SerializationException / JAXBException when using Remote Java API to retrieve KieSession from remote BPM Suite server

Issue

We're using Remote Java API to retrieve KieSession object against a remote BPM Suite server.
The client is running inside WebLogic, we see errors like below:

Caused By: org.kie.services.client.serialization.SerializationException: Unsupported JAXB Class encountered during initialization: 
Exception Description: Name collision.  Two classes have the XML type with uri http://www.w3.org/2001/XMLSchema and name string.
    at org.kie.remote.client.jaxb.ClientJaxbSerializationProvider.initialize(ClientJaxbSerializationProvider.java:105)
    at org.kie.remote.client.jaxb.ClientJaxbSerializationProvider.initialize(ClientJaxbSerializationProvider.java:98)
    at org.kie.remote.client.jaxb.ClientJaxbSerializationProvider.newInstance(ClientJaxbSerializationProvider.java:93)
    at org.kie.services.client.api.command.RemoteConfiguration.initializeJaxbSerializationProvider(RemoteConfiguration.java:90)
    at org.kie.services.client.api.command.AbstractRemoteCommandObject.<init>(AbstractRemoteCommandObject.java:79)
    at org.kie.services.client.api.command.KieSessionClientCommandObject.<init>(KieSessionClientCommandObject.java:51)
    at org.kie.services.client.api.command.RemoteRuntimeEngine.getKieSession(RemoteRuntimeEngine.java:24)
......
Caused By: javax.xml.bind.JAXBException: 
Exception Description: Name collision.  Two classes have the XML type with uri http://www.w3.org/2001/XMLSchema and name string.
 - with linked exception:
[Exception [EclipseLink-50007] (Eclipse Persistence Services - 2.4.2.v20130514-5956486): org.eclipse.persistence.exceptions.JAXBException
Exception Description: Name collision.  Two classes have the XML type with uri http://www.w3.org/2001/XMLSchema and name string.]
    at org.eclipse.persistence.jaxb.JAXBContext$TypeMappingInfoInput.createContextState(JAXBContext.java:1001)
    at org.eclipse.persistence.jaxb.JAXBContext.<init>(JAXBContext.java:169)
......
    at org.kie.remote.client.jaxb.ClientJaxbSerializationProvider.initialize(ClientJaxbSerializationProvider.java:103)
    at org.kie.remote.client.jaxb.ClientJaxbSerializationProvider.initialize(ClientJaxbSerializationProvider.java:98)