问题原因：Java编译器级别与Facted Project 中的Java 版本设定不匹配。

解决办法：将两者设置一致

1.查看Java compiler level ：

　　选中项目右键properties->Java Complier：由图可知compiler level是1.8

2.修改Project Facets的java值，使其与java complier相同：

搞定！

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