A problem occurred when I tried to run a java web-app on server

Question

I use eclipse for java EE as my IDE and tomcat as my server. Here's the problem:

Several ports (8080, 8009) required by Tomcat v5.5 Server at localhost are already in use. The server 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.

Answer 1

It is as the exception says - you have a running instance of Tomcat (or, less likely, something else), that's taking ports 8080 and/or 8009. What to do:

• if you've started tomcat, find it and stop it: using /etc/init.d/tomcat stop, or administrative tools > services > apache tomcat > stop, or shutdown.sh / shutdown.bat
• if it is not you, find the process of tomcat and kill it (task manager on windows, and something like ps ux on nix)
• if you don't find it, reboot

Answer 2

It looks like you have a Tomcat running already. It is possible that Eclipse couldn't stop Tomcat and now that it tries to run it again, it can't. Find and kill the existing process or reboot.