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Thanks liliana, but I can't execute successfully your code (unable to parse ChangeSet error).

I've tried to modify your code as follows:

  KnowledgeAgentConfiguration aconf = KnowledgeAgentFactory.newKnowledgeAgentConfiguration();

                    KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("testKAgent", aconf);

                    String fileName = "http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/plx/LATEST/ChangeSet.xml";

                    kagent.applyChangeSet(ResourceFactory.newUrlResource(fileName));

                    KnowledgeBase kbase2 = kagent.getKnowledgeBase();

                    StatefulKnowledgeSession ksession2 = kbase2.newStatefulKnowledgeSession();

                    ProcessInstance processInstance = ksession2.startProcess("plx.SimpleProcess");

But I obtain: Server returned HTTP response code: 401 for URL: http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/plx/LATEST/ChangeSet.xml

Did you remove authentication from Guvnor?