eclipse中，项目有红叉之-Java compiler level does not match the version of the installed Java project facet.

1.Java compiler level does not match the version of the installed Java project facet，意思是jdk版本和project facet版本不一致

2.解决Java Compiler和Project facets的版本需一致

原文：http://www.cnblogs.com/-scl/p/7551200.html