// 获取当前节点的activityId,即xml中每个标签的ID
String currentActivityId = execution.getCurrentActivityId();
List<Task> list1 = taskService.createTaskQuery().processInstanceId(processInstance.getProcessInstanceId()).list();
// taskService.addComment(currentTask.getId(), execution.getProcessInstanceId(), body.get("msg").toString());
BpmnModel bpmnModel = repositoryService.getBpmnModel(execution.getProcessDefinitionId());
FlowNode flowNode = (FlowNode)bpmnModel.getFlowElement(currentActivityId);
SequenceFlow sequenceFlow = flowNode.getIncomingFlows().get(0);
// 获取上一个节点的activityId
String sourceRef = sequenceFlow.getSourceRef();
// 流程回退到上一个节点，审批人继续审批
runtimeService.createChangeActivityStateBuilder().processInstanceId(processInstance.getProcessInstanceId())
.moveActivityIdTo(currentActivityId,sourceRef).changeState();
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