我已经在生产环境中运行了一个Activiti代码（在Servicemix上使用Camel运行Activiti 5.19），并且遇到了一些特殊的问题：有时我在执行过程中遇到了任务加倍的情况（其中一个甚至是三倍）。似乎没有明确的模式。如果由于某种原因任何JavaScript调用服务两次关闭同一任务，我测试过的代码将引发异常。
因为任务是运行中执行的一部分，所以无法完成加倍的任务（导致“在完成前不发出UserTask信号”异常）或删除任务。
我无法弄清楚是什么原因会导致这种后果，以及如何摆脱多余的任务才能完成受损的过程。
是否可以仅删除act_ru_task中的更高记录（具有最高任务ID）？
有人可以帮忙吗？
<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI"
typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath"
targetNamespace="http://www.activiti.org/test">
<collaboration id="Collaboration">
<participant id="pool1" name="Pool" processRef="process_pool1"></participant>
</collaboration>
<process id="new_marketing" name="marketing" isExecutable="true" activiti:candidateStarterGroups="marketing,task_manager">
<laneSet id="laneSet_new_marketing">
<lane id="lane1" name="marketing">
<flowNodeRef>usertask1</flowNodeRef>
<flowNodeRef>startevent1</flowNodeRef>
<flowNodeRef>exclusivegateway1</flowNodeRef>
<flowNodeRef>usertask2</flowNodeRef>
<flowNodeRef>usertask3</flowNodeRef>
<flowNodeRef>usertask4</flowNodeRef>
<flowNodeRef>endevent1</flowNodeRef>
<flowNodeRef>exclusivegateway2</flowNodeRef>
<flowNodeRef>exclusivegateway3</flowNodeRef>
<flowNodeRef>usertask5</flowNodeRef>
<flowNodeRef>usertask6</flowNodeRef>
<flowNodeRef>endevent2</flowNodeRef>
</lane>
</laneSet>
<startEvent id="startevent1" name="Start"></startEvent>
<userTask id="usertask1" name="Status_0" activiti:assignee="${employeeName}" activiti:candidateGroups="marketing" activiti:dueDate="${dueDate}">
<extensionElements>
<activiti:formProperty id="actionsForm" name="actions" type="enum" writable="false">
<activiti:value id="cancel" name="cancel"></activiti:value>
<activiti:value id="accepted" name="accepted"></activiti:value>
<activiti:value id="wait" name="wait"></activiti:value>
</activiti:formProperty>
</extensionElements>
</userTask>
<sequenceFlow id="flow12" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
<exclusiveGateway id="exclusivegateway1" name="Exclusive Gateway"></exclusiveGateway>
<sequenceFlow id="flow1" sourceRef="usertask1" targetRef="exclusivegateway1"></sequenceFlow>
<userTask id="usertask2" name="Status_10" activiti:assignee="${employeeName}">
<extensionElements>
<activiti:formProperty id="actionsForm" name="actions" type="enum" writable="false">
<activiti:value id="cancel" name="cancel"></activiti:value>
<activiti:value id="proceed" name="proceed"></activiti:value>
<activiti:value id="application" name="application"></activiti:value>
<activiti:value id="accepted" name="accepted"></activiti:value>
<activiti:value id="wait" name="wait"></activiti:value>
</activiti:formProperty>
</extensionElements>
</userTask>
<sequenceFlow id="flow2" sourceRef="exclusivegateway1" targetRef="usertask2">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${action == 'accepted'}]]></conditionExpression>
</sequenceFlow>
<userTask id="usertask3" name="Status_1" activiti:assignee="${employeeName}" activiti:dueDate="${dueDate}"></userTask>
<sequenceFlow id="flow3" name="Wait" sourceRef="exclusivegateway1" targetRef="usertask3">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${action == 'wait'}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="flow4" sourceRef="usertask3" targetRef="usertask1"></sequenceFlow>
<userTask id="usertask4" name="Status_1000" activiti:assignee="${employeeName}"></userTask>
<sequenceFlow id="flow5" name="GiveUp" sourceRef="exclusivegateway1" targetRef="usertask4">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${action == 'cancel'}]]></conditionExpression>
</sequenceFlow>
<endEvent id="endevent1" name="End"></endEvent>
<sequenceFlow id="flow6" sourceRef="usertask4" targetRef="endevent1"></sequenceFlow>
<exclusiveGateway id="exclusivegateway2" name="Exclusive Gateway"></exclusiveGateway>
<sequenceFlow id="flow7" sourceRef="usertask2" targetRef="exclusivegateway2"></sequenceFlow>
<endEvent id="endevent2" name="End"></endEvent>
<sequenceFlow id="flow10" sourceRef="exclusivegateway2" targetRef="usertask2">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${action == 'wait'}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="flow11" name="GiveUp" sourceRef="exclusivegateway2" targetRef="usertask4">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${action == 'cancel'}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="flow8" sourceRef="exclusivegateway2" targetRef="usertask5">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${action == 'application'}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="flow13" sourceRef="exclusivegateway2" targetRef="usertask6">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${action == 'proceed' || action == 'accepted'}]]></conditionExpression>
</sequenceFlow>
<userTask id="usertask5" name="Status_50" activiti:assignee="${employeeName}">
<extensionElements>
<activiti:formProperty id="actionsForm" name="actions" type="enum" writable="false">
<activiti:value id="cancel" name="cancel"></activiti:value>
<activiti:value id="accepted" name="accepted"></activiti:value>
</activiti:formProperty>
</extensionElements>
</userTask>
<sequenceFlow id="flow14" sourceRef="usertask5" targetRef="exclusivegateway3"></sequenceFlow>
<exclusiveGateway id="exclusivegateway3" name="Exclusive Gateway"></exclusiveGateway>
<sequenceFlow id="flow15" sourceRef="exclusivegateway3" targetRef="usertask6">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${action == 'accepted'}]]></conditionExpression>
</sequenceFlow>
<userTask id="usertask6" name="Status_90" activiti:assignee="${employeeName}"></userTask>
<sequenceFlow id="flow17" sourceRef="usertask6" targetRef="endevent2">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${action == 'accepted'}]]></conditionExpression>
</sequenceFlow>
<sequenceFlow id="flow16" sourceRef="exclusivegateway3" targetRef="usertask4">
<conditionExpression xsi:type="tFormalExpression"><![CDATA[${action == 'cancel'}]]></conditionExpression>
</sequenceFlow>
</process>
</definitions>
使用以下查询在Activiti数据库中检查了问题：
select * from act_ru_task t0 where t0.execution_id_ in (select id_ from act_ru_execution t1 where (select count(*) from act_ru_task t2 where t1.id_ = t2.execution_id_) > 1);
查询显示了30种类似情况，其中3种以下（用户登录被自动删除）：
id_ | rev_ | execution_id_ | proc_inst_id_ | proc_def_id_ | name_ | parent_task_id_ | description_ | task_def_key_ | owner_ | assignee_ |delegation_ | priority_ | create_time_ |
118399 | 1 | 118373 | 118373 | new_marketing:3:5004 | Status_50 | | | usertask5 | | auser | | 50 | 2017-08-08 08:46:28.771 |
118396 | 1 | 118373 | 118373 | new_marketing:3:5004 | Status_50 | | | usertask5 | | auser | | 50 | 2017-08-08 08:46:28.769 |
634792 | 1 | 453636 | 453636 | new_marketing:3:5004 | Status_1000 | | | usertask4 | | buser | | 50 | 2018-04-04 09:49:13.853 |
634791 | 1 | 453636 | 453636 | new_marketing:3:5004 | Status_1000 | | | usertask4 | | buser | | 50 | 2018-04-04 09:49:13.853 |
527864 | 1 | 527837 | 527837 | new_marketing:3:5004 | Status_90 | | | usertask6 | | cuser | | 50 | 2018-02-01 16:06:56.089 |
527867 | 1 | 527837 | 527837 | new_marketing:3:5004 | Status_90 | | | usertask6 | | cuser | | 50 | 2018-02-01 16:06:56.092 |