camunda如何回滚到上一个用户任务节点，java代码

你可以使用Camunda的Java API来回滚到上一个用户任务节点。下面是一个示例代码：

import org.camunda.bpm.engine.ProcessEngine;
import org.camunda.bpm.engine.ProcessEngines;
import org.camunda.bpm.engine.RuntimeService;
import org.camunda.bpm.engine.TaskService;
import org.camunda.bpm.engine.history.HistoricActivityInstance;
import org.camunda.bpm.engine.runtime.ActivityInstance;
import org.camunda.bpm.engine.runtime.ProcessInstance;
import org.camunda.bpm.engine.task.Task;

public class CamundaRollbackExample {
    public static void main(String[] args) {
        // 获取流程引擎实例
        ProcessEngine processEngine = ProcessEngines.getDefaultProcessEngine();

        // 获取运行时服务和任务服务
        RuntimeService runtimeService = processEngine.getRuntimeService();
        TaskService taskService = processEngine.getTaskService();

        // 获取当前流程实例的ID
        String processInstanceId = "YOUR_PROCESS_INSTANCE_ID";

        // 获取当前流程实例的活动实例
        ActivityInstance activityInstance = runtimeService.getActivityInstance(processInstanceId);

        // 获取当前活动实例的历史活动实例
        HistoricActivityInstance[] historicActivityInstances = activityInstance.getHistoricActivityInstances();

        // 寻找上一个用户任务节点的历史活动实例
        String previousUserTaskId = null;
        for (int i = historicActivityInstances.length - 1; i >= 0; i--) {
            HistoricActivityInstance historicActivityInstance = historicActivityInstances[i];
            if ("userTask".equals(historicActivityInstance.getActivityType())) {
                previousUserTaskId = historicActivityInstance.getActivityId();＊＊＊