我从一个朋友github项目下载了.jars，并解决了问题.

I downloaded the .jars from a friend github project and problem solved.

您可以在这里看到它的错误: https://github.com/jflex -de/jflex/issues/384

You can see it's a BUG here: https://github.com/jflex-de/jflex/issues/384

尝试降级版本.