Java问题解决：Java compiler level does not match the version of the installed Java project facet.
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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