How can i determine which servlet spec version a java WAR file uses?

StackOverflow https://stackoverflow.com/questions/1298046

  •  18-09-2019
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Question

I've got a WAR that i need to deploy with TomCat, but i'm not sure which version of the servlet spec the WAR file uses.

According to apache's site (http://tomcat.apache.org/whichversion.html) i need to download a different version according to which spec the WAR file uses.

Is there any way to tell by unzipping the WAR file and looking at some config file?

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Solution

Try looking at the DTD/Schema of the web.xml file in the WEB-INF dir.
Note, servlet containers are backward compatible, so 2.3 servlet application should run just fine under a 2.4 servlet engine.

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