IntelliJ IDEA - Address localhost:1099 is already in use

Question

I try to launch a web application with IntelliJ IDEA, but I get an error: localhost:1099 already in use.

I checked the port 1099 with lsof -i:1099 and many other relative commands, so I'm pretty sure the port 1099 is free.

This is my running configuration:

I've also changed the JMX port to 6666 & 6667 & 6668... and it doesn't work, so I think it's not really related to the port itself.

I am so confused... did anyone else have this problem?

Any help is appreciated

Answer 1

Since it is easy to tackle with Command Prompt. You can do the following. I assume you work on Windows.

Open the CMD and type following.

netstat -aon | find "1099" 

If a process uses above port, it should return something output like this.

TCP    xxx.xx.xx.xx:1099      xx.xx.xx.xxx:443      ESTABLISHED     2222 

The last column value (2222) is referred to the Process ID (PID).

Just KILL it as follows.

taskkill /F /PID 2222 

Now you can start your server.