Java error when using two submit buttons on two different forms in a jsp
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I am having some trouble figuring out why I am getting an error with my code. Below is my JSP file (the problem is with the second form):
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Book Drivers</title>
</head>
<body>
<h1>Book Demands</h1>
<form method="POST" action="BookDriver.do">
<br>View a table </br>
<input type="radio" name="tbl" value="ListTodaysDemands">List Todays Demands<br />
<input type="radio" name="tbl" value="ListAllDemands">List All Demands<br />
<input type=submit value="Go!"> <br />
</form>
</body>
<body>
<h2>Demands</h2>
<%=(String)(request.getAttribute("query"))%>
</body>
<body>
<h2>Journeys</h2>
<%=(String)(request.getAttribute("query1"))%>
</body>
<body>
<h2>Drivers</h2>
<%=(String)(request.getAttribute("query2"))%>
</body>
<body>
<h2>Book taxi</h2>
<form method="POST" action="BookDriver.do">
<table>
<tr>
<th></th>
<th>Please provide your following details</th>
</tr>
<tr>
<td>Name:</td>
<td><input type="text" name="name"/></td>
</tr>
<tr>
<td>Address:</td>
<td><input type="text" name="address"/></td>
</tr>
<tr>
<td>Destination:</td>
<td><input type="text" name="destination"/></td>
</tr>
<tr>
<td>Date:</td>
<td><input type="text" name="date"/></td>
</tr>
<tr>
<td>Time:</td>
<td><input type="text" name="time"/></td>
</tr>
<tr>
<td> <input type="submit" value="Book"/></td>
</tr>
</table>
</form>
</body>
Below is my controller:
public class BookDriver extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
LocalDate date = LocalDate.now();
String qry1 = "select * from CUSTOMER";
String qry2 = "select * from DRIVERS";
String qry3 = "select * from DEMANDS where date = '"+date+"'";
String qry4 = "select * from DEMANDS";
String qry5 = "select * from JOURNEY";
//String qry4 = "SELECT Drivers.Name, Drivers.Registration FROM Drivers LEFT JOIN Journey ON Journey.Registration = Drivers.Registration LEFT JOIN Demands ON Demands.Time = Journey.Time WHERE Demands.id IS NULL";
//String qry4 = "SELECT Drivers.Name, Drivers.Registration FROM Drivers LEFT JOIN Journey ON Journey.Registration = Drivers.Registration LEFT JOIN Demands ON Demands.Date = Journey.Date LEFT JOIN Demands ON Demands.Time = Journey.Time WHERE Demands.id IS NULL";
response.setContentType("text/html;charset=UTF-8");
HttpSession session = request.getSession(false);
Jdbc dbBean = new Jdbc();
dbBean.connect((Connection)request.getServletContext().getAttribute("connection"));
session.setAttribute("dbbean", dbBean);
if((Connection)request.getServletContext().getAttribute("connection")==null)
request.getRequestDispatcher("/WEB-INF/conErr.jsp").forward(request, response);
else if (request.getParameter("tbl").equals("ListTodaysDemands")){
String msg="No current demands";
String msg2="No current journeys";
String msg3="No current journeys";
try {
msg = dbBean.retrieve(qry3);
msg2 = dbBean.retrieve(qry5);
msg3 = dbBean.retrieve(qry2);
} catch (SQLException ex) {
Logger.getLogger(BookDriver.class.getName()).log(Level.SEVERE, null, ex);
}
request.setAttribute("query", msg);
request.setAttribute("query1", msg2);
request.setAttribute("query2", msg3);
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
else if (request.getParameter("tbl").equals("ListAllDemands")){
String msg="No current demands";
String msg2="No current journeys";
String msg3="No current drivers";
try {
msg = dbBean.retrieve(qry4);
msg2 = dbBean.retrieve(qry5);
msg3 = dbBean.retrieve(qry2);
} catch (SQLException ex) {
Logger.getLogger(BookDriver.class.getName()).log(Level.SEVERE, null, ex);
}
request.setAttribute("query", msg);
request.setAttribute("query1", msg2);
request.setAttribute("query2", msg3);
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
///////////THIS PART NOT WORKING//////////////////////////
String query = new String[5];
query[0] = (String)request.getParameter("name");
query[1] = (String)request.getParameter("address");
query[2] = (String)request.getParameter("destination");
query[3] = (String)request.getParameter("date");
query[4] = (String)request.getParameter("time");
Jdbc jdbc = (Jdbc)session.getAttribute("dbbean");
if (jdbc == null)
request.getRequestDispatcher("/WEB-INF/conErr.jsp").forward(request, response);
if(query[0].equals("") ) {
request.setAttribute("msg", "Username cannot be NULL");
}
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
The first form in the JSP works absolutely fine, the issue is with the second form. Whenever I use the button "Book" I get a null pointer exception and I cannot figure out why and if I comment out all of the code to due with the first form in the servlet, then it no longer throws the exception and it works fine.
I would really appreciate some help with this as I have now spent hours searching for a solution online and i'm still very much struggling to solve the problem.
Cheers,
java mysql sql jsp servlets
add a comment |
up vote
0
down vote
favorite
I am having some trouble figuring out why I am getting an error with my code. Below is my JSP file (the problem is with the second form):
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Book Drivers</title>
</head>
<body>
<h1>Book Demands</h1>
<form method="POST" action="BookDriver.do">
<br>View a table </br>
<input type="radio" name="tbl" value="ListTodaysDemands">List Todays Demands<br />
<input type="radio" name="tbl" value="ListAllDemands">List All Demands<br />
<input type=submit value="Go!"> <br />
</form>
</body>
<body>
<h2>Demands</h2>
<%=(String)(request.getAttribute("query"))%>
</body>
<body>
<h2>Journeys</h2>
<%=(String)(request.getAttribute("query1"))%>
</body>
<body>
<h2>Drivers</h2>
<%=(String)(request.getAttribute("query2"))%>
</body>
<body>
<h2>Book taxi</h2>
<form method="POST" action="BookDriver.do">
<table>
<tr>
<th></th>
<th>Please provide your following details</th>
</tr>
<tr>
<td>Name:</td>
<td><input type="text" name="name"/></td>
</tr>
<tr>
<td>Address:</td>
<td><input type="text" name="address"/></td>
</tr>
<tr>
<td>Destination:</td>
<td><input type="text" name="destination"/></td>
</tr>
<tr>
<td>Date:</td>
<td><input type="text" name="date"/></td>
</tr>
<tr>
<td>Time:</td>
<td><input type="text" name="time"/></td>
</tr>
<tr>
<td> <input type="submit" value="Book"/></td>
</tr>
</table>
</form>
</body>
Below is my controller:
public class BookDriver extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
LocalDate date = LocalDate.now();
String qry1 = "select * from CUSTOMER";
String qry2 = "select * from DRIVERS";
String qry3 = "select * from DEMANDS where date = '"+date+"'";
String qry4 = "select * from DEMANDS";
String qry5 = "select * from JOURNEY";
//String qry4 = "SELECT Drivers.Name, Drivers.Registration FROM Drivers LEFT JOIN Journey ON Journey.Registration = Drivers.Registration LEFT JOIN Demands ON Demands.Time = Journey.Time WHERE Demands.id IS NULL";
//String qry4 = "SELECT Drivers.Name, Drivers.Registration FROM Drivers LEFT JOIN Journey ON Journey.Registration = Drivers.Registration LEFT JOIN Demands ON Demands.Date = Journey.Date LEFT JOIN Demands ON Demands.Time = Journey.Time WHERE Demands.id IS NULL";
response.setContentType("text/html;charset=UTF-8");
HttpSession session = request.getSession(false);
Jdbc dbBean = new Jdbc();
dbBean.connect((Connection)request.getServletContext().getAttribute("connection"));
session.setAttribute("dbbean", dbBean);
if((Connection)request.getServletContext().getAttribute("connection")==null)
request.getRequestDispatcher("/WEB-INF/conErr.jsp").forward(request, response);
else if (request.getParameter("tbl").equals("ListTodaysDemands")){
String msg="No current demands";
String msg2="No current journeys";
String msg3="No current journeys";
try {
msg = dbBean.retrieve(qry3);
msg2 = dbBean.retrieve(qry5);
msg3 = dbBean.retrieve(qry2);
} catch (SQLException ex) {
Logger.getLogger(BookDriver.class.getName()).log(Level.SEVERE, null, ex);
}
request.setAttribute("query", msg);
request.setAttribute("query1", msg2);
request.setAttribute("query2", msg3);
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
else if (request.getParameter("tbl").equals("ListAllDemands")){
String msg="No current demands";
String msg2="No current journeys";
String msg3="No current drivers";
try {
msg = dbBean.retrieve(qry4);
msg2 = dbBean.retrieve(qry5);
msg3 = dbBean.retrieve(qry2);
} catch (SQLException ex) {
Logger.getLogger(BookDriver.class.getName()).log(Level.SEVERE, null, ex);
}
request.setAttribute("query", msg);
request.setAttribute("query1", msg2);
request.setAttribute("query2", msg3);
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
///////////THIS PART NOT WORKING//////////////////////////
String query = new String[5];
query[0] = (String)request.getParameter("name");
query[1] = (String)request.getParameter("address");
query[2] = (String)request.getParameter("destination");
query[3] = (String)request.getParameter("date");
query[4] = (String)request.getParameter("time");
Jdbc jdbc = (Jdbc)session.getAttribute("dbbean");
if (jdbc == null)
request.getRequestDispatcher("/WEB-INF/conErr.jsp").forward(request, response);
if(query[0].equals("") ) {
request.setAttribute("msg", "Username cannot be NULL");
}
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
The first form in the JSP works absolutely fine, the issue is with the second form. Whenever I use the button "Book" I get a null pointer exception and I cannot figure out why and if I comment out all of the code to due with the first form in the servlet, then it no longer throws the exception and it works fine.
I would really appreciate some help with this as I have now spent hours searching for a solution online and i'm still very much struggling to solve the problem.
Cheers,
java mysql sql jsp servlets
Which line is your exception thrown on?
– Dawood ibn Kareem
Nov 22 at 18:05
Post the stack trace.
– Alan Hay
Nov 22 at 18:17
Just print the values of name,address etc in the controller i think the value might be null
– Himanshu Ahuja
Nov 22 at 18:42
post all the code in your servlet...
– Jonathan Laliberte
Nov 22 at 22:00
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I am having some trouble figuring out why I am getting an error with my code. Below is my JSP file (the problem is with the second form):
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Book Drivers</title>
</head>
<body>
<h1>Book Demands</h1>
<form method="POST" action="BookDriver.do">
<br>View a table </br>
<input type="radio" name="tbl" value="ListTodaysDemands">List Todays Demands<br />
<input type="radio" name="tbl" value="ListAllDemands">List All Demands<br />
<input type=submit value="Go!"> <br />
</form>
</body>
<body>
<h2>Demands</h2>
<%=(String)(request.getAttribute("query"))%>
</body>
<body>
<h2>Journeys</h2>
<%=(String)(request.getAttribute("query1"))%>
</body>
<body>
<h2>Drivers</h2>
<%=(String)(request.getAttribute("query2"))%>
</body>
<body>
<h2>Book taxi</h2>
<form method="POST" action="BookDriver.do">
<table>
<tr>
<th></th>
<th>Please provide your following details</th>
</tr>
<tr>
<td>Name:</td>
<td><input type="text" name="name"/></td>
</tr>
<tr>
<td>Address:</td>
<td><input type="text" name="address"/></td>
</tr>
<tr>
<td>Destination:</td>
<td><input type="text" name="destination"/></td>
</tr>
<tr>
<td>Date:</td>
<td><input type="text" name="date"/></td>
</tr>
<tr>
<td>Time:</td>
<td><input type="text" name="time"/></td>
</tr>
<tr>
<td> <input type="submit" value="Book"/></td>
</tr>
</table>
</form>
</body>
Below is my controller:
public class BookDriver extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
LocalDate date = LocalDate.now();
String qry1 = "select * from CUSTOMER";
String qry2 = "select * from DRIVERS";
String qry3 = "select * from DEMANDS where date = '"+date+"'";
String qry4 = "select * from DEMANDS";
String qry5 = "select * from JOURNEY";
//String qry4 = "SELECT Drivers.Name, Drivers.Registration FROM Drivers LEFT JOIN Journey ON Journey.Registration = Drivers.Registration LEFT JOIN Demands ON Demands.Time = Journey.Time WHERE Demands.id IS NULL";
//String qry4 = "SELECT Drivers.Name, Drivers.Registration FROM Drivers LEFT JOIN Journey ON Journey.Registration = Drivers.Registration LEFT JOIN Demands ON Demands.Date = Journey.Date LEFT JOIN Demands ON Demands.Time = Journey.Time WHERE Demands.id IS NULL";
response.setContentType("text/html;charset=UTF-8");
HttpSession session = request.getSession(false);
Jdbc dbBean = new Jdbc();
dbBean.connect((Connection)request.getServletContext().getAttribute("connection"));
session.setAttribute("dbbean", dbBean);
if((Connection)request.getServletContext().getAttribute("connection")==null)
request.getRequestDispatcher("/WEB-INF/conErr.jsp").forward(request, response);
else if (request.getParameter("tbl").equals("ListTodaysDemands")){
String msg="No current demands";
String msg2="No current journeys";
String msg3="No current journeys";
try {
msg = dbBean.retrieve(qry3);
msg2 = dbBean.retrieve(qry5);
msg3 = dbBean.retrieve(qry2);
} catch (SQLException ex) {
Logger.getLogger(BookDriver.class.getName()).log(Level.SEVERE, null, ex);
}
request.setAttribute("query", msg);
request.setAttribute("query1", msg2);
request.setAttribute("query2", msg3);
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
else if (request.getParameter("tbl").equals("ListAllDemands")){
String msg="No current demands";
String msg2="No current journeys";
String msg3="No current drivers";
try {
msg = dbBean.retrieve(qry4);
msg2 = dbBean.retrieve(qry5);
msg3 = dbBean.retrieve(qry2);
} catch (SQLException ex) {
Logger.getLogger(BookDriver.class.getName()).log(Level.SEVERE, null, ex);
}
request.setAttribute("query", msg);
request.setAttribute("query1", msg2);
request.setAttribute("query2", msg3);
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
///////////THIS PART NOT WORKING//////////////////////////
String query = new String[5];
query[0] = (String)request.getParameter("name");
query[1] = (String)request.getParameter("address");
query[2] = (String)request.getParameter("destination");
query[3] = (String)request.getParameter("date");
query[4] = (String)request.getParameter("time");
Jdbc jdbc = (Jdbc)session.getAttribute("dbbean");
if (jdbc == null)
request.getRequestDispatcher("/WEB-INF/conErr.jsp").forward(request, response);
if(query[0].equals("") ) {
request.setAttribute("msg", "Username cannot be NULL");
}
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
The first form in the JSP works absolutely fine, the issue is with the second form. Whenever I use the button "Book" I get a null pointer exception and I cannot figure out why and if I comment out all of the code to due with the first form in the servlet, then it no longer throws the exception and it works fine.
I would really appreciate some help with this as I have now spent hours searching for a solution online and i'm still very much struggling to solve the problem.
Cheers,
java mysql sql jsp servlets
I am having some trouble figuring out why I am getting an error with my code. Below is my JSP file (the problem is with the second form):
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Book Drivers</title>
</head>
<body>
<h1>Book Demands</h1>
<form method="POST" action="BookDriver.do">
<br>View a table </br>
<input type="radio" name="tbl" value="ListTodaysDemands">List Todays Demands<br />
<input type="radio" name="tbl" value="ListAllDemands">List All Demands<br />
<input type=submit value="Go!"> <br />
</form>
</body>
<body>
<h2>Demands</h2>
<%=(String)(request.getAttribute("query"))%>
</body>
<body>
<h2>Journeys</h2>
<%=(String)(request.getAttribute("query1"))%>
</body>
<body>
<h2>Drivers</h2>
<%=(String)(request.getAttribute("query2"))%>
</body>
<body>
<h2>Book taxi</h2>
<form method="POST" action="BookDriver.do">
<table>
<tr>
<th></th>
<th>Please provide your following details</th>
</tr>
<tr>
<td>Name:</td>
<td><input type="text" name="name"/></td>
</tr>
<tr>
<td>Address:</td>
<td><input type="text" name="address"/></td>
</tr>
<tr>
<td>Destination:</td>
<td><input type="text" name="destination"/></td>
</tr>
<tr>
<td>Date:</td>
<td><input type="text" name="date"/></td>
</tr>
<tr>
<td>Time:</td>
<td><input type="text" name="time"/></td>
</tr>
<tr>
<td> <input type="submit" value="Book"/></td>
</tr>
</table>
</form>
</body>
Below is my controller:
public class BookDriver extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
LocalDate date = LocalDate.now();
String qry1 = "select * from CUSTOMER";
String qry2 = "select * from DRIVERS";
String qry3 = "select * from DEMANDS where date = '"+date+"'";
String qry4 = "select * from DEMANDS";
String qry5 = "select * from JOURNEY";
//String qry4 = "SELECT Drivers.Name, Drivers.Registration FROM Drivers LEFT JOIN Journey ON Journey.Registration = Drivers.Registration LEFT JOIN Demands ON Demands.Time = Journey.Time WHERE Demands.id IS NULL";
//String qry4 = "SELECT Drivers.Name, Drivers.Registration FROM Drivers LEFT JOIN Journey ON Journey.Registration = Drivers.Registration LEFT JOIN Demands ON Demands.Date = Journey.Date LEFT JOIN Demands ON Demands.Time = Journey.Time WHERE Demands.id IS NULL";
response.setContentType("text/html;charset=UTF-8");
HttpSession session = request.getSession(false);
Jdbc dbBean = new Jdbc();
dbBean.connect((Connection)request.getServletContext().getAttribute("connection"));
session.setAttribute("dbbean", dbBean);
if((Connection)request.getServletContext().getAttribute("connection")==null)
request.getRequestDispatcher("/WEB-INF/conErr.jsp").forward(request, response);
else if (request.getParameter("tbl").equals("ListTodaysDemands")){
String msg="No current demands";
String msg2="No current journeys";
String msg3="No current journeys";
try {
msg = dbBean.retrieve(qry3);
msg2 = dbBean.retrieve(qry5);
msg3 = dbBean.retrieve(qry2);
} catch (SQLException ex) {
Logger.getLogger(BookDriver.class.getName()).log(Level.SEVERE, null, ex);
}
request.setAttribute("query", msg);
request.setAttribute("query1", msg2);
request.setAttribute("query2", msg3);
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
else if (request.getParameter("tbl").equals("ListAllDemands")){
String msg="No current demands";
String msg2="No current journeys";
String msg3="No current drivers";
try {
msg = dbBean.retrieve(qry4);
msg2 = dbBean.retrieve(qry5);
msg3 = dbBean.retrieve(qry2);
} catch (SQLException ex) {
Logger.getLogger(BookDriver.class.getName()).log(Level.SEVERE, null, ex);
}
request.setAttribute("query", msg);
request.setAttribute("query1", msg2);
request.setAttribute("query2", msg3);
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
///////////THIS PART NOT WORKING//////////////////////////
String query = new String[5];
query[0] = (String)request.getParameter("name");
query[1] = (String)request.getParameter("address");
query[2] = (String)request.getParameter("destination");
query[3] = (String)request.getParameter("date");
query[4] = (String)request.getParameter("time");
Jdbc jdbc = (Jdbc)session.getAttribute("dbbean");
if (jdbc == null)
request.getRequestDispatcher("/WEB-INF/conErr.jsp").forward(request, response);
if(query[0].equals("") ) {
request.setAttribute("msg", "Username cannot be NULL");
}
request.getRequestDispatcher("/WEB-INF/bookDemands.jsp").forward(request, response);
}
The first form in the JSP works absolutely fine, the issue is with the second form. Whenever I use the button "Book" I get a null pointer exception and I cannot figure out why and if I comment out all of the code to due with the first form in the servlet, then it no longer throws the exception and it works fine.
I would really appreciate some help with this as I have now spent hours searching for a solution online and i'm still very much struggling to solve the problem.
Cheers,
java mysql sql jsp servlets
java mysql sql jsp servlets
asked Nov 22 at 17:35
Seano989
83
83
Which line is your exception thrown on?
– Dawood ibn Kareem
Nov 22 at 18:05
Post the stack trace.
– Alan Hay
Nov 22 at 18:17
Just print the values of name,address etc in the controller i think the value might be null
– Himanshu Ahuja
Nov 22 at 18:42
post all the code in your servlet...
– Jonathan Laliberte
Nov 22 at 22:00
add a comment |
Which line is your exception thrown on?
– Dawood ibn Kareem
Nov 22 at 18:05
Post the stack trace.
– Alan Hay
Nov 22 at 18:17
Just print the values of name,address etc in the controller i think the value might be null
– Himanshu Ahuja
Nov 22 at 18:42
post all the code in your servlet...
– Jonathan Laliberte
Nov 22 at 22:00
Which line is your exception thrown on?
– Dawood ibn Kareem
Nov 22 at 18:05
Which line is your exception thrown on?
– Dawood ibn Kareem
Nov 22 at 18:05
Post the stack trace.
– Alan Hay
Nov 22 at 18:17
Post the stack trace.
– Alan Hay
Nov 22 at 18:17
Just print the values of name,address etc in the controller i think the value might be null
– Himanshu Ahuja
Nov 22 at 18:42
Just print the values of name,address etc in the controller i think the value might be null
– Himanshu Ahuja
Nov 22 at 18:42
post all the code in your servlet...
– Jonathan Laliberte
Nov 22 at 22:00
post all the code in your servlet...
– Jonathan Laliberte
Nov 22 at 22:00
add a comment |
1 Answer
1
active
oldest
votes
up vote
0
down vote
Use request.getParameterValues("name").. and same for others too maybe the current value be null
add a comment |
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Use request.getParameterValues("name").. and same for others too maybe the current value be null
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Use request.getParameterValues("name").. and same for others too maybe the current value be null
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Use request.getParameterValues("name").. and same for others too maybe the current value be null
Use request.getParameterValues("name").. and same for others too maybe the current value be null
answered Nov 22 at 18:49
Himanshu Ahuja
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Which line is your exception thrown on?
– Dawood ibn Kareem
Nov 22 at 18:05
Post the stack trace.
– Alan Hay
Nov 22 at 18:17
Just print the values of name,address etc in the controller i think the value might be null
– Himanshu Ahuja
Nov 22 at 18:42
post all the code in your servlet...
– Jonathan Laliberte
Nov 22 at 22:00