Cannot upgrade/downgrade to Dynamic Web Module 3.0 facet. It is incompatibile with already installed

maven项目报错 Cannot upgrade/downgrade to Dynamic Web Module 3.0 facet. It is incompatibile with already installed facets: Java 1.5. Please modify project configuration.

找了很多网上的解决方法都没解决

有的修改.setting文件里面的东西  有的修改 web.xml里面的东西  还有向pom.xml中添加

 废话不多说 针对这个问题先上图在上解决方法

解决：  项目右键-----属性-------project facts ---找到 java 修改为1.7 即可