How to use third party javascript

Hello guys I have a trouble with using javascript plugin with vaadin 10. When i use @JavaScript("") annotation in my class it seems no working. How i use javascript plugin in my project. And i start it console throughs this error [code] Uncaught SyntaxError: Unexpected token <


Annotation looks fine to me. Check for errors in the main.js.

Unexpected token < is a JavaScript syntax error, yes. Many editors support syntax checking, or you could try an online tool like


I solved my problem. It seems my project structure little bit wrong. By the way thanks for comment.