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5.4. Using private instances
Tomcat is heavily used in development and testing scenarios where using a single system-wide instance doesn't meet the requirements of multiple users on a single system. The Tomcat packages in Ubuntu come with tools to help deploy your own user-oriented instances, allowing every user on a system to run (without root rights) separate private instances while still using the system-installed libraries.
It is possible to run the system-wide instance and the private instances in parallel, as long as they do not use the same TCP ports.