This is not a question for the JMC community - the MBeans that you see in JMC are put into the MBeanServer by whatever software stack that is interacting with that particular MBeanServer. How the MBeans got there is up to whatever software you're running. So, from the really sparse information you provided, it would seem you have a Tomcat question. Asking in a Tomcat forum might be a good idea.
Ok thank you. I'll post that question to Tomcat community instead.