Jersey Client: Cache-Manager for Conditional GET?

Jersey has wonderful support for server-side handling of Preconditions to respond to a Conditional-GET-request.

Exception while trying to use jersey and jaxb

The following code:

@POST

@Path("/previous-status/{current}")

@Consumes(MediaType.APPLICATION_XML)

@Produces(MediaType.TEXT_PLAIN)

public String getPreviousStepStatus(@PathParam("current") JAXBElement<WorkflowStep> step) {

    WorkflowStep wfStep = step.getValue();

    return DBAccessor.getPrevStepStatus(wfStep);

}