IntelliJ Idea编译报错：javacTask: 源发行版 1.7 需要目标发行版 1.7

在Project Structure中修改language level没有用时：
Stackoverflow 给出了答案：

But it maybe just enough to Right Click on module(s)/aggregated/parent module and Maven -> Reimport.

IntelliJ IDEA will respect this setting after you Reimport the Maven project in the Maven Projects tool window:

参考下面链接，非常详细的解决这个报错的方法：
https://stackoverflow.com/questions/12900373/idea-javac-source-release-1-7-requires-target-release-1-7

我是使用Maven reimport解决了该错误