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Ana said I could file an enhancement request that might help users deal with this, perhaps by offering to rename to a jar when a user adds it to WEBINF/lib.
Also Tomcat 5 has problem with that. Web modules should provide a warning message that some servers might have problems with zip files, e.g: Warning: Some web servers, like Tomcat server, don't accept libraries in the form of zip files.
What is this issue actually about?