Java compiler level does not match the version of the installed Java project facet.

原文：
Java compiler level does not match the version of the installed Java project facet.
解释：
Facted Project中的Java版本设定与项目的Java编译器的compliance level不一致。
解决办法：
首先，查看Compiler compliance level。
右键->Project->Properties->Java Compiler，获取Compiler compliance level。
然后，修改Project Facets的Java值。
右键->Project->Properties->Project Facets，选中Java，点击Modify Project...按钮，修改Java的值，使它Compiler compliance level相同。

Java compiler level does not match the version of the installed Java project facet.

原文：http://www.cnblogs.com/loveflycforever/p/5274299.html