How to run demo service on tomcat?

Question

Java

1. Note : Create a new client with the following redirect uri -
   localhost:8080/BasicWebDemo/handleInstagramToken - as I understand it, you just had to register the application, where we specify this URL for the response.
   
2. Import the maven project in your favorite IDE. -Imported libraries.
   
3. Open the config.properties in src/main/webapp/resources folder.
   Replace the clientId, clientSecret and callbackUrl with the values ​​used during Client registration on Instagram Developer website. - put in your details
   
4. Build the project and deploy the war file in your web server. - assembled and packaged in war, then threw \apache-tomcat-8.0.26\webapps along the path, restarted, hangs in the manager, but issues 404
   
5. Open the following URL : localhost:8080/BasicWebDemo - 404 error
   

Please help, because for the first time I work with a web server and for the first time for the API, using third-party libraries.

Answer 1

The 404 message indicates that the server has taken off. Servlets are required to work.