Thanks for the link wqe . I read it and do all things explained there . But I have not idea how to use real process file.
I used this to read process file
KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
kbuilder.add( ResourceFactory.newClassPathResource("SampleHumanTaskProcess.bpmn"), ResourceType.BPMN2 );
ksession.startProcess("com.sample.bpmn");
But not able to read process.