faceted project problem (java version mismatch) error message

在eclipse的 “problems” 选项卡中显示如下错误信息

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Description:Type Project facet Java 1.8 is not supported by target runtime Apache Tomcat v7.0
Resource:groupping
...

由StackOverflow上的回答可知，Java facet的版本总是需要和Java编译器的版本一致，所以最好的方式是通过Project Facets Properties面板进行修改。

1. 查看Problems面板信息
   
2. 打开Project Facets Properties面板
   
3. 修改configuration信息
   
4. 调整到和Java编译器版本相匹配
   

参考文献
[1] http://javahonk.com/project-facet-java-is-not-supported-by-target-runtime/
[2] http://stackoverflow.com/questions/2239959/faceted-project-prblem-java-version-mismatch-error-message