How to get WFMWorkflow object in URL external task java clas

Hi,

I need WFMWorkflow object in java class which is called from a URL external task in WFM.

I have tried following code but it is returning - " Invalid workflow Id <job_id>".

CSWorkflow job = task.getWorkflow();
Integer jobid = new Integer(job.getId());
long wfid = jobid.longValue();
logger.debug("wfid: " + wfid);
WFMWorkflowEngine wfengine = WFMWorkflowEngine.getInstance();
logger.debug("wfengine: " + wfengine);
WFMWorkflow workflow = wfengine.getWorkflow(wfid);

I can still see the Job in TeamSite but not sure why it is saying Invalid workflow ID. We are using TeamSite 7.2.1 on linux environment.