activiti报错：org.activiti.engine.ActivitiTaskAlreadyClaimedException: Task ‘12502‘ is already claimed

在运行activiti时，报错信息如下：

Exception in thread "main" org.activiti.engine.ActivitiTaskAlreadyClaimedException: Task '12502' is already claimed by someone else.
	at org.activiti.engine.impl.cmd.ClaimTaskCmd.execute(ClaimTaskCmd.java:50)
	at org.activiti.engine.impl.cmd.ClaimTaskCmd.execute(ClaimTaskCmd.java:24)
	at org.activiti.engine.impl.cmd.NeedsActiveTaskCmd.execute(NeedsActiveTaskCmd.java:56)
	at org.activiti.engine.impl.interceptor.CommandInvoker$1.run(CommandInvoker.java:37)
	at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:78)
	at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:57)
	at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:42)
	at org.activiti.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:48)
	at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:63)
	at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:35)
	at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:44)
	at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:39)
	at org.activiti.engine.impl.TaskServiceImpl.claim(TaskServiceImpl.java:184)
	at com.yao.day05.GroupTest.main(GroupTest.java:78)

查看该任务发现已经存在任务执行人，所以设置候选用户时报错如上图。

对已有任务执行人，不应再设置候选用户。

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