Error in deploying process

[jmix2006]

This is my code

ProcessDefinition processdefinition =ProcessDefinition.parseParResource("src/process/processmetier.par");
JbpmContext jbpmcontext = JbpmContext.getCurrentJbpmContext();
 try
 {
 jbpmcontext.deployProcessDefinition(processdefinition);
 }
 finally
 {
 jbpmcontext.close();
 }
return mapping.findForward("existe");
}

the error "in is null"
how to resolve the probleme

[aguizar]

Did you open a JbpmContext elsewhere by a call to JbpmConfiguration.createJbpmContext()? If you didn't, the reference returned by JbpmContext.getCurrentJbpmContext() will be null.