执行退回到上一节点操作时，完成操作执行报错空指针，task的值都取到了啊，执行到taskService.complete 时就报错

 try {
            Map<String, Object> variables;
            // 取得当前任务.当前任务节点
            HistoricTaskInstance currTask = historyService
                    .createHistoricTaskInstanceQuery().taskId(taskId)
                    .singleResult();
            // 取得流程实例，流程实例
            ProcessInstance instance = runtimeService
                    .createProcessInstanceQuery()
                    .processInstanceId(currTask.getProcessInstanceId())
                    .singleResult();
            if (instance == null) {
             log.info("流程结束");
                log.error("出错啦！流程已经结束");
//                return "ERROR";
            }
            variables = instance.getProcessVariables();
            // 取得流程定义
            ProcessDefinitionEntity definition = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService)
                    .getDeployedProcessDefinition(currTask
                            .getProcessDefinitionId());
            if (definition == null) {
             log.info("流程定义未找到");
                log.error("出错啦！流程定义未找到");
//                return "ERROR";
            }
            // 取得上一步活动
            ActivityImpl currActivity = ((ProcessDefinitionImpl) definition)
                    .findActivity(currTask.getTaskDefinitionKey());

            //也就是节点间的连线
            List<PvmTransition> nextTransitionList = currActivity
                    .getIncomingTransitions();
            // 清除当前活动的出口
            List<PvmTransition> oriPvmTransitionList = new ArrayList<PvmTransition>();
            //新建一个节点连线关系集合

            List<PvmTransition> pvmTransitionList = currActivity
                    .getOutgoingTransitions();
            //
            for (PvmTransition pvmTransition : pvmTransitionList) {
                oriPvmTransitionList.add(pvmTransition);
            }
            pvmTransitionList.clear();

            // 建立新出口
            List<TransitionImpl> newTransitions = new ArrayList<TransitionImpl>();
            for (PvmTransition nextTransition : nextTransitionList) {
                PvmActivity nextActivity = nextTransition.getSource();
                ActivityImpl nextActivityImpl = ((ProcessDefinitionImpl) definition)
                        .findActivity(nextActivity.getId());
                TransitionImpl newTransition = currActivity
                        .createOutgoingTransition();
                newTransition.setDestination(nextActivityImpl);
                newTransitions.add(newTransition);
            }
            // 完成任务
            List<Task> tasks = taskService.createTaskQuery()
                    .processInstanceId(instance.getId())
                    .taskDefinitionKey(currTask.getTaskDefinitionKey()).list();
            for (Task task : tasks) {
                taskService.complete(task.getId(), variables);
//                UserInfo user = SessionUtil.getUser();
//              Authentication.setAuthenticatedUserId(user.getUserId()+"");//批注人的名称  一定要写，不然查看的时候不知道人物信息
//              taskService.addComment(taskId, null, comment);//comment为批注内容
                historyService.deleteHistoricTaskInstance(task.getId());
            }
            // 恢复方向
            for (TransitionImpl transitionImpl : newTransitions) {
                currActivity.getOutgoingTransitions().remove(transitionImpl);
            }
            for (PvmTransition pvmTransition : oriPvmTransitionList) {
                pvmTransitionList.add(pvmTransition);
            }
            log.info("OK");
            log.info("流程结束");

//            return "SUCCESS";
        } catch (Exception e) {
         log.error("失败");
            log.error(e.getMessage());
//            return "ERROR";
        }

下面是控制台代码

  2016-09-13 11:51:06|http-bio-8080-exec-10|DEBUG|org.activiti.engine.impl.interceptor.CommandContext.close(CommandContext.java:171)|Error while closing command context
 java.lang.NullPointerException
    at org.activiti.engine.impl.bpmn.behavior.BpmnActivityBehavior.performOutgoingBehavior(BpmnActivityBehavior.java:126)
    at org.activiti.engine.impl.bpmn.behavior.BpmnActivityBehavior.performDefaultOutgoingBehavior(BpmnActivityBehavior.java:66)
    at org.activiti.engine.impl.bpmn.behavior.FlowNodeActivityBehavior.leave(FlowNodeActivityBehavior.java:44)
    at org.activiti.engine.impl.bpmn.behavior.AbstractBpmnActivityBehavior.leave(AbstractBpmnActivityBehavior.java:47)
    at org.activiti.engine.impl.bpmn.behavior.UserTaskActivityBehavior.signal(UserTaskActivityBehavior.java:225)
    at org.activiti.engine.impl.persistence.entity.ExecutionEntity.signal(ExecutionEntity.java:409)
    at org.activiti.engine.impl.persistence.entity.TaskEntity.complete(TaskEntity.java:203)
    at org.activiti.engine.impl.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:52)
    at org.activiti.engine.impl.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:24)
    at org.activiti.engine.impl.cmd.NeedsActiveTaskCmd.execute(NeedsActiveTaskCmd.java:59)
    at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:24)
    at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:57)
    at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47)
    at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:133)
    at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45)
    at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:37)
    at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:40)
    at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:35)
    at org.activiti.engine.impl.TaskServiceImpl.complete(TaskServiceImpl.java:179)
    at com.skysoft.irevisit.visit.service.dengji.DengJiService.boHui(DengJiService.java:649)
    at com.skysoft.irevisit.visit.web.dengji.DengJiController.execute(DengJiController.java:355)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:214)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:748)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:945)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:876)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:931)

Activiti 工作流加签后获取TaskDefinition报空指针异常

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