404 response while running simple hello restapi on tomcat

Question

I am attempting basic hello restAPi following this link. The program is done in java in eclipse.

However towards I get the error:

Several ports (8005, 8080, 8009) required by Tomcat v8.5 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 or change the port number(s).

I have tried changing port number, it doesn't work.

I have did the checks and I get the apache home page on 8080 and not on the changed port number 8081. Running on 8081 gives me a 404 response while running on 8080 throws the error shown above.

What's the way around this behavior?

Any help is appreciated.

Answer 1

Get the PID of the process which is using ports (8005, 8080, 8009) and end the process from Task Manager if required.

To get PID, follow this answer

Just open a command shell and type : (saying your port is 123456)

netstat -a -n -o | find "123456"

You will see everything you need

The headers are :

Proto  Local Address          Foreign Address        State          PID  
TCP    0.0.0.0:37             0.0.0.0:0              LISTENING      1111