【maven 报错】maven项目update之后报错One or more constraints have not been satisfied.

在右键项目Update Project之后
报错：
One or more constraints have not been satisfied.
Spring 4.1 requires Java 1.6 or newer.

解决问题：

The solution is I have to goto to the ".settings" folder which is at the project location and deleted "org.eclipse.wst.common.project.facet.core.xml" file and restarted the process again. This time it worked

这个从网上照的一个办法，比较好用，有作用。

就是删除掉.setting文件下的这个文件。然后将项目从MyEcplise中删掉，再Import进去，然后，发现项目不能被Tomcat识别了。

然后右键项目-->properties-->myEcplise下面的-->project Facts 将项目的web版本，java版本，hibernate版本等一并都选择好，再回来项目就好了。