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Editorial Team
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Asked: 2026-05-22T20:52:55+00:00

Background: I have a servlet in which I am dynamically generating javascript and putting

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Background:

I have a servlet in which I am dynamically generating javascript and putting into a variable script. Then I set the response content type as text/javascript and send the script over to the client:

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

Problem:

The browser does download the javascript file but it doesn’t recognize the functions inside the file. If I create a static javascript file and use it instead, it works fine.

Question:

What should be done so that browser treats response from the servlet as a regular javascript file?

Thank you for help.

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1 Answer

  1. Editorial Team

    It should work fine. I suspect that you’re just including it the wrong way or calling the function too early or that the response content is malformed.

    I just did a quick test:

    <!DOCTYPE html>
<html lang="en">
    <head>
        <title>SO question 6156155</title>
        <script src="javaScriptServlet"></script>
        <script>test()</script>
    </head>
    <body>
    </body>
</html>

    with

    @WebServlet(urlPatterns={"/javaScriptServlet"})
public class JavaScriptServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/javascript");
        response.getWriter().write("function test() { alert('peek-a-boo'); }");
    }

}

    and I get

    Screenshot of browser alert showing "peak-a-boo" message in it.

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