Can't open PDF from Servlet - servlets

Question

i trying to open a pdf right after i created.
I want to see the result in my browser, but i dosen't.
By the way, the programm runs on a server.
If i try to open the pdf there, no problem - all works fine.
Just the client can't see the pdf if he clicks, for example, on a button.
Here's my code:
#WebServlet("/GeneratePdfCustomer")
public class GeneratePdfCustomer extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
final int id = Integer.parseInt(request.getParameter("id"));
makePdf(request, response, "POST",id);
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void makePdf(HttpServletRequest request,
HttpServletResponse response, String methodGetPost, int id)
throws ServletException, IOException {
response.setContentType("application/pdf");
try {
Document document = new Document();
PdfWriter.getInstance(document, response.getOutputStream());
document.open();
document.add(new Paragraph("Test"));
document.close();
} catch (Exception e) {
System.out.println("Error" + e);
}
}
}
I using the iText library.
EDIT:
Now i have change my servlet code, but still not working for me.
I can't see the pdf in my browser. Firefox and IE both are show nothing.
package de.WorldCheckCustomer.model;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.pdf.PdfWriter;
#WebServlet("/GeneratePdfCustomer")
public class GeneratePdfCustomer extends HttpServlet {
protected void doPost(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
makePdf(request, response);
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
makePdf(request, response);
}
public void makePdf(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// Set content type to application / pdf
// browser will open the document only if this is set
response.setContentType("application/pdf");
// Get the output stream for writing PDF object
OutputStream out = response.getOutputStream();
try {
Document document = new Document();
/* Basic PDF Creation inside servlet */
PdfWriter.getInstance(document, out);
document.open();
document.add(new Paragraph("Tutorial to Generate PDF using Servlet"));
document.add(new Paragraph(
"PDF Created Using Servlet, iText Example Works"));
document.close();
} catch (DocumentException exc) {
throw new IOException(exc.getMessage());
} finally {
out.close();
}
}
private static final long serialVersionUID = 6067021675155015602L;
}