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You may feel this is a duplicated question, but none of the questions with the same title solve my problems. I am using Jersey 3.0 creating a RESTful web service in Eclipse, I use Tomcat 9.0 as my server.

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Jersey 3.x uses Servlet 5.0, which now uses the Jakarta naming. All the javax.servlet packaging has now changed to jakarta.servlet. The Jersey ServletContainer now extends jakarta.servlet.http.HttpServlet; it is not javax anymore. The first Tomcat to use Jakarta is Tomcat 10.x; Tomcat 9.x still uses the javax.servlet packaging. So if you want to use Jersey 3.x, then you should upgrade your Tomcat to 10.x.

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