Java compiler level does not match the version of the installed Java project facet
2018-02-28 11:13
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右键项目，properties
选择java Compiler， 取消选择2处，选择3处为1.8（jdk版本），取消4处选择。
P.S.顺便说一下，还有个比较类似的地方，就是build path那里，经常jdk是j2ee1.5，我也不知道为什么，反正改成alternate JRE ，1.8版本的就可以了
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