Target runtime Apache Tomcat v6.0 is not defined.
选择natigator 然后选择 “org.eclipse.wst.common.project.facet.core.xml”<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<runtime name="Apache Tomcat v6.0"/>
<fixed facet="wst.jsdt.web"/>
<fixed facet="java"/>
<fixed facet="jst.web"/>
<installed facet="java" version="1.6"/>
<installed facet="jst.web" version="2.5"/>
<installed facet="wst.jsdt.web" version="1.0"/>
</faceted-project>
去掉
<runtime name="Apache Tomcat v6.0"/>
改成
<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
<runtime name="Apache Tomcat v6.0"/>
<fixed facet="wst.jsdt.web"/>
<fixed facet="java"/>
<fixed facet="jst.web"/>
<installed facet="java" version="1.6"/>
<installed facet="jst.web" version="2.5"/>
<installed facet="wst.jsdt.web" version="1.0"/>
</faceted-project>
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