JFreeChart not being displayed on JSP Page

Question

I am new to JFreeChart and trying to implement it in JSP. I am accepting user input through a form on JSP page and and sending to Servlet page where my chart is formed after fetching data from database. After that I want to display the chart back on my JSP page but unfortunately the chart is being displayed on my Servlet page and the page is not redirected back to my JSP page. I am not getting the reason why...

Here is my JSP page up.jsp

      <form action="FormChart"  class="values" method="post">
            <table cellspacing="4" cellpadding="4">
                <tr>
                    <td>Select Industry</td>
                    <td><select name="sta" class="dropdown">
                            <option>Industry</option>
                            <option>Cotton</option>
                            <option>Sugar</option>
                            </select></td>
                </tr>
                <tr>
                    <td>Select Category </td>
                    <td><select name="ind" class="dropdown">
                            <option>Category</option>
                            <option>Area</option>
                            <option>Production</option>
                            <option>Yield</option>
                        </select></td>
                </tr>
                <tr>
                    <td>Input Year Range</td>
                </tr>
                <tr>
                    <td>Year 1</td>
                    <td><input type="text" name="yr1" class="yearbox"/></td>
                    <td style="padding-left: 20px;">Year 2</td>
                    <td><input type="text" name="yr2" class="yearbox"/>
                </tr>
                <tr>
                    <td><input type="submit" value="Submit" style="margin-top: 10px;" name="bt" class="btn btn-primary btn1"/></td>
                </tr>
            </table>
            </form>
            <div style="border:1px solid; float:left;width:55%;margin-top:10px;margin-left:20px;border-radius:5px;height:400px;">
                <img src="/FormChart" WIDTH="600" HEIGHT="400" BORDER="0" usemap="#chart"/>
                <%--<jsp:include page="/FormChart" />--%>
    </div>

Here is my Servlet Page FormChart.java

        protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
        response.setContentType("image/png");
        OutputStream ot = response.getOutputStream(); 
        String qry;
        String y1, y2;
        String indus;
        float a;
        int b;
        DefaultCategoryDataset categoryDataset = new DefaultCategoryDataset();
        String st;
        String img;
        categoryDataset = new DefaultCategoryDataset();
        try 
        {
            y1 = request.getParameter("yr1");
            y2 = request.getParameter("yr2");
            st = request.getParameter("sta").toLowerCase();
            indus = request.getParameter("ind").toLowerCase();
            qry = "select year," + indus + " from " + st + " where year between '" + y1 + "' and '" + y2 + "'  and state='Uttar Pradesh'";
            utility ut = new utility();
            ResultSet rs = ut.DQL(qry);
            while (rs.next()) {
                a = Float.parseFloat(rs.getString("" + indus));
                b = Math.round(a);
                categoryDataset.setValue(b, "" + st, "" + rs.getString("year"));
            }
            JFreeChart chart = ChartFactory.createBarChart3D("" + st, // Title
                    "Year", // X-Axis label
                    "" + indus,// Y-Axis label
                    categoryDataset, // Dataset
                    PlotOrientation.VERTICAL,
                    true, // Show legend
                    true,
                    false
            );
            final ChartRenderingInfo info = new ChartRenderingInfo(new StandardEntityCollection());
            final File file1 = new File("F:/JavaAptech/Netbeans 74 applications/MinorProj/web/" + "up" + st + indus + y1 + y2 + ".png");
            img = "up" + st + indus + y1 + y2 + ".png";
           ChartUtilities.writeChartAsPNG(ot, chart, 600, 400);
           ChartUtilities.saveChartAsPNG(file1, chart, 600, 400, info);
           chart.setBorderVisible(true);
           request.getRequestDispatcher("/up.jsp").forward(request,response);
        } 
        catch (Exception e) 
        {
           // out.println(e);
        }
}