错误提示:The project was not built since its build path is incomplete. Cannot find the class file for ja
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原文：http://www.cnblogs.com/mmzs/p/7662863.html
错误类型：
搞了很久才找到原因.解决办法写出来分享:
出现以上错误的原因是玩耍maven时多装了个jre。本来Eclipse在建立项目时，会自动参照你的jre路径，但多个版本就没办法加载了。
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解决办法：
进入window \\ preferences \\ java \\ Installed JREs
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