根据马丁·克莱顿的建议，我的previous注释复制下面的答案。

As per Martin Clayton's suggestions, my previous comment is copied below as an answer.

的叹息。我已经想通了，因为我已经删除了原先导致这一问题的第一罐（我不相信，即使我真的需要它们了），问题只是移动到下一个罐子...好了，这让我怀疑系统性故障。原来我没有在事实上已经在classpath中aload垃圾罐子。想必搞砸了在某些时候下载或什么的。反正现在所有固定。干杯

"Sigh. I'd figured that because I'd removed the first jars that originally caused this problem (I wasn't even convinced I really needed them any more) and the problem just moved to the next jar... well, that made me suspicious of a systemic fault. Turns out I did in fact have aload of garbage jars on the classpath. Must have screwed up a download or something at some point. Anyway, all fixed now. Cheers"