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WARNING: string with unknown version [3.1]. The default version will be used.

Whenever I run web aps in eclipse, I always get this warning:

WARNING: Unknown version string [3.1]. Default version will be used.

What is it? What should I do with this?

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2 answers

Or you can just use a web server that does not support Servlet 3.1. For example, Tomcat 7 only supports Servlet 3.0 and below. While Tomcat 8 supports servlet 3.1.

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You receive a warning because XML is incorrect, but the application must work with effective version 2.3 based on DOCTYPE. Removing an unnecessary version attribute will cause this warning to disappear.

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Source: https://habr.com/ru/post/1544613/

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