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Editorial Team
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Asked: 2026-06-09T09:19:02+00:00

I got tomcat running on port 8080 and simple servlet: import java.io.*; import java.text.*;

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I got tomcat running on port 8080 and simple servlet:

import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.awt.*;

public class MyHelloWorld extends HttpServlet {

    public void doGet(HttpServletRequest request, 
            HttpServletResponse response)
    throws IOException, ServletException
    {
        String data = "Hello World from servlet!";
        response.setContentType("text/plain");
        response.setCharacterEncoding("UTF-8");
        response.getWriter().write(data);
    }
}

wget on URL to this servelet, retrives a string:

"Hello World from servlet!"

also web browser prints it, so it works, and tomcat’s access log shows response ‘200’

But when im trying to get this string via my javascript:

<html>

<head>
<script src="http://code.jquery.com/jquery-latest.min.js"></script>
<script>


            $.getJSON({ 
    type: "GET", url: "http://localhost:8080/examples/MyHelloWorld", 
    contentType: "text/plain", 
    error: function(xhr, ajaxOptions, thrownError){ 
                alert(ajaxOptions);
                alert(xhr.status); 
                alert(thrownError);
            }, 
    processData: true, 
    success: function(data, textStatus, jqXHR){ alert(data); }
});
</script>

</script>

</head>

In tomcat’s log i can see response 200, but browser does not show anything – just blank page with no content. If I change getJSON into get or ajax i get alerts with:

xhr.status = 0
ajaxOptions = "error"
thrownError = empty

web server is apache and it runs on port 80

Thx for all help

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1 Answer

  1. Editorial Team

    Try something like this:

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
    String data = "Hello World from servlet!";
    response.setContentType("text/plain");
    response.setCharacterEncoding("UTF-8");

    if (request.getContentType().equals("application/json")) {
        data = "\"" + data + "\"";
    }

    response.getWriter().write(data);
}

    And in your js:

    $.getJSON("http://localhost:8080/examples/MyHelloWorld", function(data) {
   alert(data)
})
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