Null session variable

Ok, i have a problem which is really annoying me and i have been stuck on for a while. I am developing a website for my brothers company and am really stuck for time for the launch date. I developed a website last year which worked fine and i am re using the code from that. I am setting a session variable "sessEmail" when the user logs in and want to retrieve it when they go to add a produt to their cart. Here is my code
String Email = request.getParameter("txtEmail");
String Password = request.getParameter("txtPassword");
session.setAttribute("sessEmail",Email);
Object o = session.getAttribute("sessEmail");
String s = o.toString();
out.print(s);
I am just printing out the "sessEmail" to make sure it is working. It works fine when i try and retrieve the session variable on the same page were i set it but on a seperate page it wont work. It is returning a null pointer exception because the session variable has no value. It is occuring when i try to convert an object to a string.
Any help would be much appreciated as i am stuck for time.
Cheers

Ok the first question to be asked is why it is null?
The most obvious answer is that you have cookies disabled, and are not using URL rewriting.
To retain the session, the server issues a "Session Cookie" with your jsessionid in it. If you have cookies switched off on your browser, it won't retain the session.
To confirm this print out session.getId() on your pages. If it continually changes, you aren't keeping your session. If it remains the same, you HAVE got a session, and need to check why you are putting a null value there.
To retain session, you need to run every link/url that gets printed to your page through the method response.encodeURL() which will add on the session id manually if cookies are not supported.
Hope this helps,
evnafets

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Hello again.
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 org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
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session.setAttribute("VarSession", "empty");
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%>
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package ConfigAnlsEspect;
import java.io.*;
import java.net.*;
import java.util.*;
import java.text.*;
import javax.servlet.http.HttpSession;
import javax.servlet.*;
import javax.servlet.http.*;
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Thanks very much

I have solved the problem, doing (in the java class):
package ConfigAnlsEspect;
import java.io.*;
import java.net.*;
import java.util.*;
import java.text.*;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.*;
import javax.servlet.http.*;
public class Config extends HttpServlet{
 HttpSession session;
 String valor = null;
 public Config (HttpSession session){
 this.session = session;
 valor = (String)this.session.getAttribute("VarSession");
 public String getValueSession(){
 return valor;
}is it rigth ??

Help Needed in checking session variable

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On login button click the function being executed is as shown
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username.setUsername(itUserName.getValue().toString());
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And to set username as null on logout, I used this function on logout click
public void clearSession()
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#{sessionScope.Username.username==null} outcome is expired
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How to get the session variable value in JSF

Hi
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Code to set and destroy session variables in Java Server Pages(JSP)

code to set and destroy session variables in Java Server Pages(JSP)
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we have use following statement to set session
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You can put and get these data in any businness component using following methods:



private void setToJboSession(String key, Object val){
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if (userData == null) {
userData = new Hashtable();
userData.put(key, val);
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and



private Object getFromJboSession(String key){
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Kuba

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PS: I've attached my result page's code to this
message.

Gabe the Animator wrote:
> <?php require_once('Connections/sales.php'); ?>
> <?php
> if (!function_exists("GetSQLValueString")) {
> function GetSQLValueString($theValue, $theType,
$theDefinedValue = "",
> $theNotDefinedValue = "")
> {
> $theValue = get_magic_quotes_gpc() ?
stripslashes($theValue) : $theValue;
>
> $theValue = function_exists("mysql_real_escape_string")
> mysql_real_escape_string($theValue) :
mysql_escape_string($theValue);
>
> switch ($theType) {
> case "text":
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"NULL";
> break;
> case "double":
> $theValue = ($theValue != "") ? "'" .
doubleval($theValue) . "'" :
> "NULL";
> break;
> case "date":
> $theValue = ($theValue != "") ? "'" . $theValue . "'" :
"NULL";
> break;
> case "defined":
> $theValue = ($theValue != "") ? $theDefinedValue :
$theNotDefinedValue;
> break;
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> }
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>
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Danilo Celic
| Extending Knowledge Daily :
http://CommunityMX.com/
| Adobe Community Expert

Session variable not passing between pages

Hi, I've got a form that calculates checkbox values and puts them in a total field called txtTotal. When the user clicks send, I need to pass the total to a payment page. The form page has PHP
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$_SESSION['sessTotal'] = $_POST['txtTotal'];
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Here is all the PHP from the form page as I'm pretty new to PHP and not sure if there's a conflict (should session_start appear more than once?) Thanks guys
<?php require_once('Connections/df.php'); ?>
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?>
<?php
if (!function_exists("GetSQLValueString")) {
function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "")
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$colname_userDets = "-1";
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$colname_userDets = $_SESSION['MM_Username'];
mysql_select_db($database_df, $df);
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OK I got it. I needed
session_start();
$_SESSION['sessTotal'] = $_POST['txtTotal'];
on the payments page as well, not just session_start();

How do I prepopulate a bind variable from a session variable?

Hello. I have a scenario where I have a customer Id I need to set as the bind variable and then execute the query before the page comes up. How do I do this? Here's what I've tried (and why it didn't work)
- I tried using the 'ExecuteWithParameters' method from the view object as a method in the task flow. I would then pass in the session variable as a parameter. For some reason it can never find the executewithparameters method on the view object. I'm guessing because it wants to go through the application module
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Hi,
1 - create a bind variable and add it to the ViewObject query
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5 - in the bindings file, under executables, create an "invokeAction" entry and point it to the executeWithParams operation
Frank

Access session variable in Java Function in JSP

Hi Experts !!
I am developing an application using STRUTS MVC...
Very sorry if u have problem understanding my question, i ll try to improve... and sorry if i can't post codes here
Basic question is ....
I want to open a word document on pageLoad of JSP, the word document is not a single document, there is a form in which there is a "name" and "template" whenever user clicks on a button there is one action attached to it which creates a copy of that template in a different folder.. on the next page OnLoad i want to open that particular document. for that i have created a variable and also have set in the session, just want to access it in the below code.
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I am aware of something like
obj = w.Documents.Open(<%'sowFileCreated'%>);
but i m not sure how to write....
Plz help.....

If you're working under a framework like struts you should definitely be using JSTL tags rather than scriptlet code to access variables within the page. With JSTL code <% codes can be almost entirely avoided.
To transfer a value from a Servlet to a JSP don't use a session variable, use a request attribute. Session variables should only be used when values have to survive from one transaction to another.
You can write something like:
obj = w.Documents.open('<c:out value="${openURL}"/>');in the Javascript portion of your JSP.
Just beware of potential problems with quotes. The coresponding code in the Servlet would be like:
request.setAttribute("openURL", openUrl);

Problem accessing session variables in JSP

 Hi all,
 i am retrieving the value of session variables in a JSP page. the session varibale
 is set at the
 server side. sometimes the jsp is able to retrieve the value and sometimes it
 doesn't.
 Thanks & Regards
 Tarun


if getAttribute return null so there is no such session attribute,anyway
 check your browser if cookies are enabled.
 "Tarun Mangal" <[email protected]> wrote in message
 news:400759e9$[email protected]..
 >
 > Hi all,
 > i am retrieving the value of session variables in a JSP page. the session
 varibale
 > is set at the
 > server side. sometimes the jsp is able to retrieve the value and sometimes
 it
 > doesn't.
 >
 > Thanks & Regards
 > Tarun

Need Help With Redirect That Uses Session Variable

I am new to dynamic sites, php, and developer toolbox, but I have been able to create a login site using the different form wizards fairly easily (in CS3 with Developers toolbox).
 
 I am trying to set a server behavior on a page that redirects the user to a new page if a session variable matches a recordset.
 
 I was using an extension (PHP Sessions - http://www.adobe.com/cfusion/exchange/index.cfm?event=extensionDetail&extid=681308 ) that worked great, but when I installed developers toolbox, it stopped working (get error message about runtime/MX environment).
 
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 ------------------------------------
 session_start();
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 ------------------------------------
 
 It redirects regardless of the match. Any ideas on what I can do to get this working? Here is all of the code (with block from above inserted) up until the doc type:
 ------------------------------------
 <?php require_once('../Connections/project1.php'); ?>
 <?php // Load the tNG classes require_once('../includes/tng/tNG.inc.php'); // Make unified connection variable $conn_project1 = new KT_connection($project1, $database_project1); //Start Restrict Access To Page $restrict = new tNG_RestrictAccess($conn_project1, "../"); //Grand Levels: Any $restrict->Execute(); //End Restrict Access To Page if (!function_exists("GetSQLValueString")) { function GetSQLValueString($theValue, $theType, $theDefinedValue = "", $theNotDefinedValue = "") { $theValue = get_magic_quotes_gpc() ? stripslashes($theValue) : $theValue; $theValue = function_exists("mysql_real_escape_string") ? mysql_real_escape_string($theValue) : mysql_escape_string($theValue); switch ($theType) { case "text": $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL"; break; case "long": case "int": $theValue = ($theValue != "") ? intval($theValue) : "NULL"; break; case "double": $theValue = ($theValue != "") ? "'" . doubleval($theValue) . "'" : "NULL"; break; case "date": $theValue = ($theValue != "") ? "'" . $theValue . "'" : "NULL"; break; case "defined": $theValue = ($theValue != "") ? $theDefinedValue : $theNotDefinedValue; break; } return $theValue; } } // FELIXONE - 2002 SB by Felice Di Stefano - www.felixone.it session_start(); if (!isset($HTTP_SESSION_VARS[$_SESSION['kt_firstname']]) || $HTTP_SESSION_VARS[$_SESSION['kt_firstname']] = $row_Recordsetfname['firstname']) { header ("Location: ../firstname/firstname1.php"); } $colname_Recordsetfname = "-1"; if (isset($_SESSION['kt_user_name'])) { $colname_Recordsetfname = $_SESSION['kt_user_name']; } mysql_select_db($database_project1, $project1); $query_Recordsetfname = sprintf("SELECT firstname FROM registration WHERE user_name = %s", GetSQLValueString($colname_Recordsetfname, "text")); $Recordsetfname = mysql_query($query_Recordsetfname, $project1) or die(mysql_error()); $row_Recordsetfname = mysql_fetch_assoc($Recordsetfname); $totalRows_Recordsetfname = mysql_num_rows($Recordsetfname); $colname_Recordset1 = "-1"; if (isset($_SESSION['kt_user_name'])) { $colname_Recordset1 = $_SESSION['kt_user_name']; } mysql_select_db($database_project1, $project1); $query_Recordset1 = sprintf("SELECT `Date` FROM registration WHERE user_name = %s", GetSQLValueString($colname_Recordset1, "text")); $Recordset1 = mysql_query($query_Recordset1, $project1) or die(mysql_error()); $row_Recordset1 = mysql_fetch_assoc($Recordset1); $totalRows_Recordset1 = mysql_num_rows($Recordset1); ?>
 
 ------------------------------

I am new to adobe toolbox... I ve created a ligin page but not sure how to pass the session variable. I am trying to direct successful login to a page like... index.php?id=filter
 
 been struggling all day with this. Please help!!!
 
 <?php require_once('Connections/comm.php'); ?>
 <?php // Load the common classes require_once('includes/common/KT_common.php'); // Load the tNG classes require_once('includes/tng/tNG.inc.php'); // Make a transaction dispatcher instance $tNGs = new tNG_dispatcher(""); // Make unified connection variable $conn_comm = new KT_connection($comm, $database_comm); // Start trigger $formValidation = new tNG_FormValidation(); $formValidation->addField("kt_login_user", true, "text", "", "", "", ""); $formValidation->addField("kt_login_password", true, "text", "", "", "", ""); $tNGs->prepareValidation($formValidation); // End trigger // Make a login transaction instance $loginTransaction = new tNG_login($conn_comm); $tNGs->addTransaction($loginTransaction); // Register triggers $loginTransaction->registerTrigger("STARTER", "Trigger_Default_Starter", 1, "POST", "kt_login1"); $loginTransaction->registerTrigger("BEFORE", "Trigger_Default_FormValidation", 10, $formValidation); $loginTransaction->registerTrigger("END", "Trigger_Default_Redirect", 99, "{kt_login_redirect}"); // Add columns $loginTransaction->addColumn("kt_login_user", "STRING_TYPE", "POST", "kt_login_user"); $loginTransaction->addColumn("kt_login_password", "STRING_TYPE", "POST", "kt_login_password"); $loginTransaction->addColumn("kt_login_rememberme", "CHECKBOX_1_0_TYPE", "POST", "kt_login_rememberme", "0"); // End of login transaction instance // Execute all the registered transactions $tNGs->executeTransactions(); // Get the transaction recordset $rscustom = $tNGs->getRecordset("custom"); $row_rscustom = mysql_fetch_assoc($rscustom); $totalRows_rscustom = mysql_num_rows($rscustom); ?>
 
 
 
 
 
 
<script src="includes/common/js/base.js" type="text/javascript"></script>
 
<script src="includes/common/js/utility.js" type="text/javascript"></script>
 
<script src="includes/skins/style.js" type="text/javascript"></script>
 <?php echo $tNGs->displayValidationRules();?>
 
 
 
 <?php echo $tNGs->getLoginMsg(); ?>
 <?php echo $tNGs->getErrorMsg(); ?>
 
<form method="post" id="form1" class="KT_tngformerror" action="%3C?php%20echo%20KT_escapeAttribute(KT_getFullUri());%20?%3E">
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
<table cellpadding="2" cellspacing="0" class="KT_tngtable">
<tr>
<td class="KT_th">
<label for="kt_login_user">Username:</label>
</td>
<td>
<input type="text" name="kt_login_user" id="kt_login_user" value="<?php echo KT_escapeAttribute($row_rscustom['kt_login_user']); ?>" size="32" />
 <?php echo $tNGs->displayFieldHint("kt_login_user");?> <?php echo $tNGs->displayFieldError("custom", "kt_login_user"); ?></td>
</tr>
<tr>
<td class="KT_th">
<label for="kt_login_password">Password:</label>
</td>
<td>
<input type="password" name="kt_login_password" id="kt_login_password" value="" size="32" />
 <?php echo $tNGs->displayFieldHint("kt_login_password");?> <?php echo $tNGs->displayFieldError("custom", "kt_login_password"); ?></td>
</tr>
<tr>
<td class="KT_th">
<label for="kt_login_rememberme">Remember me:</label>
</td>
<td>
<input <?php if (!(strcmp(KT_escapeAttribute($row_rscustom['kt_login_rememberme']),"1"))) {echo "checked";} ?> type="checkbox" name="kt_login_rememberme" id="kt_login_rememberme" value="1" />
 <?php echo $tNGs->displayFieldError("custom", "kt_login_rememberme"); ?></td>
</tr>
<tr class="KT_buttons">
<td colspan="2">
<input type="submit" name="kt_login1" id="kt_login1" value="Login" />
 </td>
</tr>
</table>
 
<a href="forgot_password.php">Forgot your password?</a>
 </form>

Server hangs and session variable value not maintained.

dear all,
this is exteremetly urgent. i upgraded my tomcat to 4.1.24.but i have problems running the same code which was working earlier, i get null in the value of session variable. and also get the following error
////////////////error got /////////////
Compile failed; see the compiler error output for details.
at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:842)
at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:682)
at org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:317)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:370)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext
.java:473)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper
.java:190)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:2
95)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:256)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:191)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:
2415)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:180)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatche
rValve.java:171)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:172)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:641)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:174)
at org.apache.catalina.core.StandardPipeline$StandardPipelineValveContex
t.invokeNext(StandardPipeline.java:643)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:480)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:22
3)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:594)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:392)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:565)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:619)
at java.lang.Thread.run(Thread.java:536)
///////////////end of error messsge ////////////
the code where i am getting this message is as follows
<%@ page session="true"%>
<HTML>
<HEAD><TITLE> LOGGED IN ok</TITLE> </HEAD>
<%@ page import="java.sql.*" %>
<%! // declaring variables
String s = "";
java.sql.ResultSet rs=null;
java.sql.Connection con;
java.sql.Statement stmt=null,stmt1=null;
String username = "";
String password = "";
String Ousername = "";
String Opassword = "";
String changepass="";
String usertype ="",useremail="",EmpName="";
%>
<body>
 <%
 try
 //set session for max of 100 milliseconds
 // session.setMaxInactiveInterval(10000);
 Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
 con = java.sql.DriverManager.getConnection("jdbc:odbc:Driver={Microsoft Access Driver (*.mdb)};" +"DBQ=c:/vishal/HelpDesk.mdb;DriverID=22;READONLY=false","","");
 stmt = con.createStatement();
 s = "select * from LoginUser";
 username = request.getParameter("LogonId"); //get this through prev. form
 password = request.getParameter("txtPassword");
 out.println(username + " " + password);
 // make explicitly to lower case
 username = username.toLowerCase();
 rs = stmt.executeQuery(s);
 while(rs.next())
 //getting data from database
 Ousername = rs.getString("EmpName");
 Opassword = rs.getString("Password");
 useremail = rs.getString("EmailId");
 usertype = rs.getString("UserType");
 if(Opassword.equals(password) && Ousername.equals(username)) //found match correct entry
 changepass = request.getParameter("PasswordNew");
 if(changepass != null)
 stmt1 = con.createStatement(java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_UPDATABLE);
 s = "update LoginUser set Password = '" + changepass + "' where EmpName = '" + username +"'";
 out.println(s);
 stmt1.executeUpdate(s);
 stmt1.close();
 if(usertype.equals("User") == false)//ie admin
 session.setAttribute("username",username);
************************this value not maintained *********************
 session.setAttribute("useremail",useremail);
 session.setAttribute("usertype",usertype);
************************this value not maintained *********************
 //closing connections
 %>
 <jsp:forward page= "ComplaintType.jsp" />
 <%
 else //user
 EmpName = username;
 session.setAttribute("EmpName",EmpName);
 session.setAttribute("useremail",useremail);
 //closing connections
 %>
 <jsp:forward page="ComplaintCategory.jsp" />
 <%
 }//end if
 }//while loop
 //first closing connections then forwarding
 %>
 <jsp:forward page="InvalidLOGIN.jsp" />
 <%
 ///rs.close();
 ////closing
 //stmt.close();
 // con.close();
 }//try
 catch(Exception ep)
 out.println(ep);
 System.exit(1);
 %>
</BODY>
</HTML>

hi all,
thanx a lot for your help,specially hari52
hari52 strangely enough the code started working,but
now i have another problem
after a while my server hangs or gets shutdown ,a
message is shown as
"java.exe has generated error and will be shutdown"
i know that more connections can be a prob. but i
make sure that connections r closed on each page,also
i am a newbie and do not have the time at present to
learn abt. connection pool ,can this problem be
solved easily?
it would be a great help again on your part,
thanx again,You remove the System.exit(1) line from the code inside the catch block
and try again. That's the reason tomcat getting down. System.exit(1) should not be used inside jsp. it will make the underlaying Servlet Engine to shutdown.

Null session variable

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