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,










share|improve this question






















  • 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















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,










share|improve this question






















  • 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













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,










share|improve this question













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






share|improve this question













share|improve this question











share|improve this question




share|improve this question










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


















  • 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












1 Answer
1






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up vote
0
down vote














Use request.getParameterValues("name").. and same for others too maybe the current value be null







share|improve this answer





















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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







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        Use request.getParameterValues("name").. and same for others too maybe the current value be null








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        share|improve this answer










        answered Nov 22 at 18:49









        Himanshu Ahuja

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