Project facet Java 6.0 is not supported by target runtime Apache Tomcat v5.5.
工程出现红叉叉，报错的信息是 Project facet Java 6.0 is not supported by target runtime Apache Tomcat v5.5.解决的方法：window -> preferences -> server -> Runtime Environmenets
选中Apache Tomcat
点击Edit,在弹出的窗口中配置JRE
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