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

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。