What to do if Eclipse showing Port Error || Tomcat Server Port Error || localhost is already in use

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What to do if Server is already in use.

'Starting Tomcat v8.0 Sever at localhost' has encountered a problem.
Port 8080 required by Tomcat v8.0 Server at localhost is already in use. There may already be running in another process, or a system process may be using the port. To start this server you will need to stop the other process or change the port number(s).
Why eclipse is showing port is in use??
Troubleshooting a port is already in use.
Several ports(8005, 8080, 8009) required by Tomcat Server at localhost are already in use
port already in use problem of Apache Tomcat in eclipse
java programming
Thanks..!!

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