在用Eclipse部署项目时，有时候会出现如下问题：
解决方法
一、
在项目t的.setting folder下面，有个名为org.eclipse.wst.common.project.facet.core.xml的文件，里面配置
有各种版本信息。此时，按照本机配置修改这个文件，把配置文件中把<installed facet="jst.web" version="3.0"/> 改成低些的版本version="2.5" 问题就解决了。
二、
使用高版本的tomcat。（发布工程使用的是tomcat6.0）
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