Caling a servlet from a jsp and return back a jsp
<p>I tried to access a servlet from a jsp and then the code with the websrvice if the array list passes as 0.It should show a image and if it passes 1 it should show a different jsp.I am able to generate the code but it is not working as expected.Can any one figure out what the problem is.</p>

<p>package sal;</p>

<pre><code>import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class Amberalerts
 */
public class Amberalerts extends HttpServlet {
    private static final long serialVersionUID = 1L;


    public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException {

        List  list = getList();
        if(list != null &amp;&amp; list.size() != 0){
          dispatchToShowJsp(req, resp, "/ShowImage.jsp");
        }else{
            dispatchToShowJsp(req, resp, "/ShowDefaultMsg.jsp");
        }

        // writeImageTOBuffer(resp);
    }
    private List getList() {
        List&lt;String&gt; list = new ArrayList&lt;String&gt;();
        list.add("Result");
        return list;
    }
    private void dispatchToShowJsp(HttpServletRequest req,
            HttpServletResponse resp, String jsplocation) throws IOException {
        try {
            getServletConfig().getServletContext().getRequestDispatcher(
                    jsplocation).forward(req,resp);
        } catch (ServletException e) {

            e.printStackTrace();
        }
    }
    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */


    private void writeImageTOBuffer(HttpServletResponse resp)
            throws FileNotFoundException, IOException {
        // Get the absolute path of the image
        ServletContext sc = getServletContext();
        String filename = sc.getRealPath("rsc/image.gif");

        // Get the MIME type of the image
        String mimeType = sc.getMimeType(filename);
        if (mimeType == null) {
            sc.log("Could not get MIME type of "+filename);
            resp.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            return;
        }

        // Set content type
        resp.setContentType(mimeType);

        // Set content size
        File file = new File(filename);
        resp.setContentLength((int)file.length());

        // Open the file and output streams
        FileInputStream in = new FileInputStream(file);
        OutputStream out = resp.getOutputStream();

        // Copy the contents of the file to the output stream
        byte[] buf = new byte[1024];
        int count = 0;
        while ((count = in.read(buf)) &gt;= 0) {
            out.write(buf, 0, count);
        }
        in.close();
        out.close();
    }


    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

}
</code></pre>
