why this test case can't pass

 public void testBasicTransitionLogs() {
 ProcessDefinition processDefinition = ProcessDefinition.parseXmlString(
 "<process-definition>" +
 " <start-state>" +
 " <transition to='state' />" +
 " </start-state>" +
 " <state name='state'>" +
 " <transition to='end' />" +
 " </state>" +
 " <end-state name='end' />" +
 "</process-definition>"
 );
 processDefinition = this.saveAndReload(processDefinition);

 // start a process instance
 ProcessInstance processInstance = new ProcessInstance(processDefinition);
 processInstance = this.saveAndReload(processInstance);
 Token token = processInstance.getRootToken();
 processInstance.signal();
 processInstance = this.saveAndReload(processInstance);

 // check the transition log (from the start state to the state)
 LoggingInstance loggingInstance = processInstance.getLoggingInstance();
 List transitionLogs = loggingInstance.getLogs(TransitionLog.class);
 assertEquals(1, transitionLogs.size());
 TransitionLog transitionLog = (TransitionLog) transitionLogs.get(0);
 assertSame(token, transitionLog.getToken());
 assertNotNull(transitionLog.getDate());
 assertSame(processDefinition.getStartState(), transitionLog.getSourceNode());
 assertSame(processDefinition.getNode("state"), transitionLog.getDestinationNode());
 processInstance = this.saveAndReload(processInstance);
 // signal the process to continue (which will move it to the end state)
 processInstance.signal();
 processInstance = this.saveAndReload(processInstance);
 // check the transition log (from the state to the end state)
 transitionLogs = loggingInstance.getLogs(TransitionLog.class);
 assertEquals(2, transitionLogs.size());
 transitionLog = (TransitionLog) transitionLogs.get(1);
 assertSame(token, transitionLog.getToken());
 assertNotNull(transitionLog.getDate());
 assertSame(processDefinition.getNode("state"), transitionLog.getSourceNode());
 assertSame(processDefinition.getNode("end"), transitionLog.getDestinationNode());
 }

 public void testBasicTransitionLogs() {
 ProcessDefinition processDefinition = ProcessDefinition.parseXmlString(
 "<process-definition>" +
 " <start-state>" +
 " <transition to='state' />" +
 " </start-state>" +
 " <state name='state'>" +
 " <transition to='end' />" +
 " </state>" +
 " <end-state name='end' />" +
 "</process-definition>"
 );

 // start a process instance
 ProcessInstance processInstance = new ProcessInstance(processDefinition);
 Token token = processInstance.getRootToken();
 processInstance.signal();

 // check the transition log (from the start state to the state)
 LoggingInstance loggingInstance = processInstance.getLoggingInstance();
 List transitionLogs = loggingInstance.getLogs(TransitionLog.class);
 assertEquals(1, transitionLogs.size());
 TransitionLog transitionLog = (TransitionLog) transitionLogs.get(0);
 assertSame(token, transitionLog.getToken());
 assertNotNull(transitionLog.getDate());
 assertSame(processDefinition.getStartState(), transitionLog.getSourceNode());
 assertSame(processDefinition.getNode("state"), transitionLog.getDestinationNode());

 // signal the process to continue (which will move it to the end state)
 processInstance.signal();

 // check the transition log (from the state to the end state)
 transitionLogs = loggingInstance.getLogs(TransitionLog.class);
 assertEquals(2, transitionLogs.size());
 transitionLog = (TransitionLog) transitionLogs.get(1);
 assertSame(token, transitionLog.getToken());
 assertNotNull(transitionLog.getDate());
 assertSame(processDefinition.getNode("state"), transitionLog.getSourceNode());
 assertSame(processDefinition.getNode("end"), transitionLog.getDestinationNode());
 }