You can't deploy an EAR file on tomcat alone, it is only a servlet container so you can only deploy WAR files -- you need to install a full J2EE server like JBoss to deploy EAR files. Now it could be that the EAR file only contains a WAR file, and the WAR file could be extracted (these are just zip files with different extensions) and deployed by copying bits into the existing WEB-INF, but that may or may not work.
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