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 <
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42901.png

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 http://esprima.org/demo/validate.html

-Olli

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