背景：
由于在日常情况下，我们的多实例要动态添加人员的场景，有没有这样的api呢？新的flowable有这样的功能。
具体实现
xml
<userTask id="miTasks" name="My Task ${loopCounter}" activiti:assignee="${assignee}">
<multiInstanceLoopCharacteristics isSequential="false">
<loopDataInputRef>assigneeList</loopDataInputRef>
<inputDataItem name="assignee" />
<completionCondition>${nrOfCompletedInstances/nrOfInstances >= 0.6 }</completionCondition>
</multiInstanceLoopCharacteristics>
</userTask>
具体实现
List<String> assigneeList = Arrays.asList("kermit", "gonzo", "mispiggy", "fozzie", "bubba");
String procId = runtimeService.startProcessInstanceByKey("miParallelUserTasksBasedOnCollection", CollectionUtil.singletonMap("assigneeList", assigneeList)).getId();
List<org.flowable.task.api.Task> tasks = taskService.createTaskQuery().orderByTaskAssignee().asc().list();
assertEquals(5, tasks.size());
assertEquals("bubba", tasks.get(0).getAssignee());
assertEquals("fozzie", tasks.get(1).getAssignee());
assertEquals("gonzo", tasks.get(2).getAssignee());
assertEquals("kermit", tasks.get(3).getAssignee());
assertEquals("mispiggy", tasks.get(4).getAssignee());
runtimeService.addMultiInstanceExecution("miTasks", procId, Collections.singletonMap("assignee", (Object) "johndoe"));
tasks = taskService.createTaskQuery().orderByTaskAssignee().asc().list();
assertEquals(6, tasks.size());
说明：
runtimeService.addMultiInstanceExecution(要加签的节点id,流程实例id, Collections.singletonMap("单个对象的别名", (Object) "对象值"));
原文：https://www.cnblogs.com/liuwenjun/p/10315993.html