项目移除原来的jre环境lib后，添加本地的jre，报错如下：

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

问题就出在切换了java版本上：
在项目的properties中，myeclipse->project facets->java version改成1.7
即可。

eclipse中切换jre后报错：Java compiler level does not match the version of the installed Java project facet.