错误提示:The project was not built since its build path is incomplete. Cannot find the class file for java.lang.Object. Fix the build path then try building this project The type java.lang.Object cannot b

原文：http://www.cnblogs.com/mmzs/p/7662863.html

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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