Why is Tomcat throwing \"Several ports (8005, 8080, 8009) required by Tomcat Server at localhost are already in use\"?

Troubleshooting "Several ports (8005, 8080, 8009) required by Tomcat Server at localhost are already in use"

When encountering this error during Tomcat startup, it's likely that another instance of Tomcat is already running on the specified ports.

Root Cause

This issue arises when multiple Tomcat instances attempt to listen on the same ports.

Solution

To resolve this issue, you can take the following steps:

1. Verify Tomcat Instance: Visit http://localhost:8080 in your web browser. If you see the Tomcat home page or a Tomcat-specific 404 error page, it indicates that Tomcat is running.
2. Shutdown Tomcat: Navigate to the Tomcat installation folder's /bin subfolder and execute the shutdown.bat (Windows) or shutdown.sh (Unix) script.
3. Kill Java Processes: Close Eclipse and open the task manager. Kill all java and/or javaw processes.
4. Disable Windows Service: If you have installed Tomcat as a Windows service, open the services manager (Start > Run > services.msc) and stop the Tomcat service. Consider uninstalling the service for development purposes.
5. Configure Different Ports: If you need two Tomcat instances to run simultaneously, configure the second instance to listen on different ports. Refer to the Tomcat documentation for details.

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