Activiti task claim cocurrent – 国内版 Bing
https://cn.bing.com/search?q=Activiti+task+claim+cocurrent&qs=n&form=QBRE&sp=-1&pq=activiti+task+claim+cocurr&sc=0-26&sk=&cvid=0120407A2DF14B35A1548CFAFE1E9A61
ActivitiTaskAlreadyClaimedException (Activiti – Engine 5.22.0 API)
https://www.activiti.org/javadocs/org/activiti/engine/activititaskalreadyclaimedexception
activiti 自定义用户、组 – 喵″的博客 – CSDN博客
https://blog.csdn.net/ii_bat/article/details/51406659
工作流（Workflow） — Activiti入门解析 – 青青向日葵的博客 – CSDN博客
https://blog.csdn.net/qq_35133320/article/details/80373623
jdeveloper – Concurrent transaction issue in activiti framework we have fixed but need some feedback – Stack Overflow
https://stackoverflow.com/questions/53959393/concurrent-transaction-issue-in-activiti-framework-we-have-fixed-but-need-some-f
