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Q: 如下图的错误

A: JDK版本低，升级jdk

 

Q: 更新jar或者代码后, 编译出错, ClassNotFound, MethodNotFound等等

A: 用WinRAR打开对应的jar包看, 是否存在ClassNotFound的class, 如果jar里存在, 那一般还是环境问题, 检查工程依赖以及手动rebuild.

 

Q: idea里用ant编译, 失败了, 但是看不到详细的报错

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