Eclipse报错-Description Resource Path Location Type Unbound classpath container: ‘JRE System Library

Eclipse报错-Description Resource Path Location Type Unbound classpath container: ‘JRE System Library

运行环境:win7
在eclipse中创建Java SE项目时，出现以下情况：
Java程序出现红色感叹号

控制台报如下错误：

Description	Resource	Path	Location	Type
Unbound classpath container: 'JRE System Library [JavaSE-1.7]' in project 'myProject'	

Description	Resource	Path	Location	Type
The project cannot be built until build path errors are resolved	

简单解决办法，选择JRE的其他选项进行创建。

如果还是解决不了，推荐以下方法。
导入javaee项目后报Description Resource Path Location Type Unbound classpath container: 'JRE System Library
Unbound classpath container: ‘JRE System Library [jdk1.8]’ in project ****