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)
