Tomcat version 7.0 only supports J2EE 1.2, 1.3, 1.4, and Java EE 5 and 6 Web modules
解决方法：
找到文件
.settings->org.eclipse.wst.common.project.facet.core.xml。
<installed facet="jst.web" version="3.1"/>
把版本改低
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