1. Project --> properties --> compiler
--> server --> Runtime Environment
或者是对整个eclipse生效
Window --> preferences --> compiler
--> server --> Runtime Environment
2. 修改配置文件,在所属工程的 navigator 视图下
文件 org.eclipse.wst.common.project.facet.core.xml
<installed facet="java" version="1.7"/> 改成:<installed facet="java" version="1.6"/>
有时重新编译甚至重启后,该文件没有更新
project facet java version 1.7 is not supported
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转载自william-third.iteye.com/blog/1783073
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