Server Tomcat v9.0 Server at localhost was unable to start within 45 seconds. If the server requires more time, try increasing the timeout in the server editor.

Try the following steps

Step1: Go to Windows option -> select preference.
Step2: Select General -> Network Connection.
Step3: Select the Active Provider as Manual.
Step4: Restart the tomcat and run. It will work.

If it doesn't work, change the timeout of server in server view. Double click on the tomcat and see timeout options and modify it.