Ember - Chrome - under source tab, not able to debug js files

in ember project the JS files is generated and is integrated with the application WEB .war files. When i access the application URL like http://localhost:4200/applicationName i can see the js files under Source Tab of Chrome, but i am not able to debug those JS files. Also i am not sure this because of the JS files are genarated with some build number like projectname-1221434545kjk345345kj345.js Ideally i have to see the all the JS files with the project structure.

the problem is if i do any changes in JS i have to build all project and there i can see the reflected changes, but same changes reflected i am not able to see on 4200 ember server, the ember server shows the like Build is Success but no changes reflected on 4200 Server?

I need help how should i get changes reflected without complete project Build?