Exception: Cannot forward after response has been committed
I have been working on this website for my university project and I was trying to create a register servlet.
The HTML works just fine, but instead of the desired message I get
"Exception: Cannot forward after response has been committed"
Code:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class Servlet_register extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
response.setContentType("text/html; charset=ISO-8859-7");
PrintWriter out = new PrintWriter(response.getWriter(), true);
String username=request.getParameter("username");
String password=request.getParameter("password");
String email=request.getParameter("email");
String style=request.getParameter("style");
String surname=request.getParameter("surname");
String name=request.getParameter("name");
String age=request.getParameter("age");
String sex=request.getParameter("sex");
String country=request.getParameter("country");
String city=request.getParameter("city");
RequestDispatcher dispatcher = getServletContext()
.getRequestDispatcher("/servlet/ErrorHandlerServlet");
try {
username=new String(username.getBytes("ISO-8859-1"), "ISO-8859-7");
password=new String(password.getBytes("ISO-8859-1"), "ISO-8859-7");
email=new String(email.getBytes("ISO-8859-1"), "ISO-8859-7");
style=new String(style.getBytes("ISO-8859-1"), "ISO-8859-7");
surname=new String(surname.getBytes("ISO-8859-1"), "ISO-8859-7");
name=new String(name.getBytes("ISO-8859-1"), "ISO-8859-7");
country=new String(country.getBytes("ISO-8859-1"), "ISO-8859-7");
city=new String(city.getBytes("ISO-8859-1"), "ISO-8859-7");
out.println("<html>");
out.println("<title>Artelier - Your Art Community</title>");
out.println("<style type='text/css'>");
out.println("<!--#wrapper {");
out.println(" background-color: #f7f7f7;");
out.println(" width: 800px;");
out.println(" margin-right: auto;");
out.println(" margin-left: auto;");
out.println(" text-align: justify;");
out.println(" border-top-color: #f7f7f7;");
out.println(" border-right-color: #f7f7f7;");
out.println(" border-bottom-color: #f7f7f7;");
out.println(" border-left-color: #f7f7f7;");
out.println("}");
out.println("* {");
out.println(" margin: 0px;");
out.println("}");
out.println("#navigation {");
out.println(" background-color: #DBDBB7;");
out.println(" width: 800px;");
out.println(" text-align: right;");
out.println(" float: left;");
out.println(" height: 20px;");
out.println(" font-family: Arial, Helvetica, sans-serif;");
out.println(" font-size: 12px;");
out.println("}");
out.println(".style1 {color: #000;}");
out.println(".style1 a:link {color:#000;}");
out.println(".style1 a:visited {color:#000;}");
out.println(" out.println('.style1 a:active {color:#000;}");
out.println("");
out.println("#wrapper #navigation #position {");
out.println(" margin-right: 400px;");
out.println("}");
out.println("");
out.println("#wrapper #bodyArea #left {");
out.println(" width: 550px;");
out.println(" float: left;");
out.println(" font-family: Arial, Helvetica, sans-serif;");
out.println(" font-size: 14px;");
out.println(" text-align: left;");
out.println("}");
out.println("#wrapper #bodyArea #right {");
out.println(" width: 250px;");
out.println(" float: right;");
out.println(" background-color: #e2e2e2;");
out.println(" font-family: Arial, Helvetica, sans-serif;");
out.println(" font-size: 14px;");
out.println("}");
out.println("p {");
out.println(" margin: 15px;");
out.println(" font-family: Arial, Helvetica, sans-serif;");
out.println(" font-size: 12px;");
out.println("}");
out.println("#wrapper #bodyArea #footer {");
out.println(" height: 100px;");
out.println(" clear: both;");
out.println(" font-family: Arial, Helvetica, sans-serif;");
out.println(" font-size: 10px;");
out.println(" text-align: center;");
out.println("}");
out.println("");
out.println("");
out.println("#search {");
out.println(" width: 400px;");
out.println(" background-color: #DBDBB7;");
out.println(" float: right;");
out.println(" height: 30px;");
out.println("}");
out.println("");
out.println("#wrapper #navigation p {");
out.println(" text-align: left;");
out.println("}");
out.println("#wrapper #search p {");
out.println(" text-align: right;");
out.println("}");
out.println("");
out.println("body {");
out.println(" background-color: #003;");
out.println(" background-image: url();");
out.println(" background-repeat: repeat-x;");
out.println("}");
out.println("-->");
out.println("</style>");
out.println("<link href='css/layout.css' rel='stylesheet' type='text/css' />");
out.println("<center>");
out.println("<div id='wrapper'>");
out.println(" <div id='navigation'>");
out.println(" <div class = 'style1'>");
out.println(" || <a href='home.html'>Home </a>|| <a href='publish.html'>Publish Note</a> || <a href='profile.html'>Edit Profile</a> || <a href='group.html'>Create Group</a> || Logout ||");
out.println(" </div>");
out.println(" </div>");
out.println(" <img src='Arterlierlg.jpg' width='800' height='130' alt='artelierlg' />");
out.println(" <div id='bodyArea'>");
out.println(" <div id='left'>");
out.println(" <p> </p>");
if (!(username.length() > 0) || !(email.length() > 0)) {
request.setAttribute("error",
"Please fill the forms marked with the asterisk.");
dispatcher.forward(request, response);
return;
}
Database db = new Database();
db.open();
if (db.isUserRegistered(username, email)) {
request.setAttribute("error", db.getErrorMessages());
db.close();
dispatcher.forward(request, response);
return;
}
db.registerUser(username, password, email, style, name, surname, age, sex, country, city);
db.close();
out.println(" <p><strong>Registration successful.</strong></p>");
out.println(" </div>");
out.println(" <div id='right'>");
out.println(" </div>");
out.println(" <div id='footer'>");
out.println(" <p> </p>");
out.println(" <p>© 2009 Team 27. All rights reserved.</p>");
out.println(" </div>");
out.println(" </div>");
out.println("</div></center>");
out.println("</html>");
} catch (Exception ex) {
out.println("Exception: " + ex.getMessage());
out.println("</body>");
out.println("</html>");
}
}
}// End of class
Any help?
