There's no built-in solution for this. The only execution languages supported by jBPM 4.x are jPDL and BPMN 2.0 (not finished yet). If you are looking for an open source XPDL-engine then there is Bonita and jBPM 3.x also offers a BPEL-engine. However BPEL support has been dropped and the new Riftsaw project (based up-on Apache ODE) is addressing BPEL support.