Issue
When I open my file list-student.jsp. I experienced the following error:
Starting Tomcat v9.0 Server at localhost has encountered a problem. The server cannot be started because one or more of the ports are invalid. Open the server editor and correct invalid ports.
I tried to go server tab and change the port from 8080 to different number, but it doesn't work. I had the same problem before and I changed 8080 to another number liked 8181 and it worked, but today, even I tried to change port number and the problem can't be fixed.
Solution
The issue is that the Tomcat admin port was not defined. You need to have it as an actual number such as 9000 rather than as a hyphen -.
Answered By - Joseph Waweru
Answer Checked By - Timothy Miller (JavaFixing Admin)
