// jsp snippet <button name=TesterButton value=TesterButton onClick=location.href=’TesterServlet’;> Servlet Snippet of class TesterServlet writer.println( (String)request.getParameter(TesterButton)

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Asked: June 3, 20262026-06-03T06:30:41+00:00 2026-06-03T06:30:41+00:00

// jsp snippet
<button name="TesterButton" value="TesterButton" onClick="location.href='TesterServlet';">

Servlet Snippet of class TesterServlet

writer.println( (String)request.getParameter("TesterButton") ); // always returns null

The above servlet always returns null. Why does it return null ?

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Editorial Team · Answer 1 · 2026-06-03T06:30:43+00:00

It’s working exactly as you told the code to do: changing the window location to the given URL. So, no surprises.

What you actually want should be coded as follows:

<form action="TesterServlet">
    <input type="submit" name="TesterButton" value="TesterButton" />
</form>

Or if you really insist in using JS for this for some reason:

<button name="TesterButton" value="TesterButton" onclick="location.href='TesterServlet?TesterButton=TesterButton';">

Note that the use of onClick instead of onclick indicates that you’re possibly reading outdated or poor HTML resources/examples.

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