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Editorial Team
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Asked: 2026-06-18T00:58:48+00:00

I want to pass a String from a Servlet to a jsp page, where

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I want to pass a String from a Servlet to a jsp page, where it has to be passed on to a init function that resides in an external .js. That’s what I got so far:

servlet

request.setAttribute("jsonString", json.toString());
RequestDispatcher dispatcher = request.getRequestDispatcher("graph.jsp");
dispatcher.forward(request, response);

jsp

<body onload="init('<%= request.getParameter("jsonString") %>');">

js

function init(jsonString){

    var json = jsonString;

Unfortunately the only thing I receive in the init function is null. I made sure that json.toString() returns the correct value. So it must get lost between the forwarding and the init function. What is the correct way to do this?

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1 Answer

  1. Editorial Team

    You are setting an attribute, but retrieving a parameter, which is not the same thing.
    I think you should try expression language

    <body onload="init('${jsonString}')">

    You could also use <%= request.getAttribute("jsonString") %>, but to me it is less readable, whereas EL is more concise.

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