上网搜了下,大部分的报错原因:重启时候 之前的tomcat未正常关闭 ,导致在重启时候 报了这个问题。mac下解决:

ps -ef|grep tomcat

找到在进行的tomcat ,kill -9  进程号 ,关闭即可。

然而自己的原因是:编译的target目录有两个同样的class文件,类似下面的:

不轻忽为甚会有两个,删除target重新编译即可。

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