tomcat cannot start under linux

When starting tomcat under Linux, if the service fails to start, you can check the catalina.out log file in the logs folder. Cat my log file to get the following error message:

cat catalina.out
Error: Exception thrown by the agent : java.rmi.server.ExportException: Port already in use: 8101; 
nested exception is:

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Literally, my 8101 port was blocked occupied, so use the command:

netstat -anp

to check the status of each port occupied by the process. The output of this command includes the pid of the process. After getting the pid, use the command:

ps -ef|grep PID

to view Details of the process.

If you confirm that this process can be stopped, use the command:

kill pid

and then restart tomcat!

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