Target runtime Apache Tomcat v7.0 is not defined.

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開啟項目，找到.settings--->org.eclipse.wst.common.project.facet.core 修改這個檔案中：

 

<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
  <runtime name="Apache Tomcat v7.0"/>
  <fixed facet="java"/>
  <fixed facet="wst.jsdt.web"/>
  <fixed facet="jst.web"/>
  <fixed facet="dorado7.core"/>
  <installed facet="java" version="1.6"/>
  <installed facet="jst.web" version="2.5"/>
  <installed facet="wst.jsdt.web" version="1.0"/>
  <installed facet="dorado7.core" version="1.0"/>
</faceted-project>

將<runtime name="Apache Tomcat v7.0"/>刪除掉儲存即可

Target runtime Apache Tomcat v7.0 is not defined.