Untitled

resp.setContentType("text/javascript");
resp.getWriter().println(script);

<html>
<head>
<script type='text/javascript' src='URL_TO_YOUR_SERVLET'></script>
</head>
</html>

<html>
<body>
 <script type='text/javascript'>
     <!-- write your generated JS here -->
 </script>
</body>
</html>

<%@ page language="java" contentType="text/javascript; charset=UTF-8" pageEncoding="UTF-8"%>
alert('Pure JavaScript right here!');

contentType="text/javascript; charset=UTF-8"