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Undeployment Failure
XXX could not be redeployed because it could not be completely removed in the undeployment phase. the most common cuase of this problem is attempting to redeploy while the server is running,which has locked one or more files.
to correct the deployment you will need to stop the server and then redeploy the project before restarting the server.
最明显的就是你的项目中所有文件都正确，但是在项目名上显示有错误
解决办法：
把项目中引用的jar文件重新加一遍就行了，基本原因就是以前的jar文件不存在了，但是项目信息中还有，即项目的.classpath文件中还有不存在的jar文件引用。
可以右键点项目名称，选择Properties,选择Java Build Path,选择Libraries,把所有项目中的jar都remove，然后再点"add jars"，把项目中的jar文件都加进来，再次部署就正常了 。
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