Disabling session in servlet
In jsp pages session is created by default. To disable it we use <%@ session="false %>. How do we accomplish the same thing in servlets? Thank you in advance. BTW: I looked at the java class file deirved from jsp with disabled session but it didn't make any sense. Obviously it happens in the pageContext initialization but it doesn't appeal to my servlets.
HttpSession session = request.getSession(false);
Similar Messages
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How to disable sessions in CS6?
InDesign Server CS6 added a mechanic of multi-threading jobs via sessions.
Now you can begin session and end session via SOAP web service call.
However, the sessions add a huge overhead for those who want to use multi-instance instead of multi-threading.
A webservice call without a session ID is always ~500ms slower while it creates a session in the background. The session is then appears to be used on a ~5 second sliding timeout allowing subsequent calls to be 500ms faster, however if you wait around 10 seconds, the next call recreates the session and increases render time by ~500ms again.
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I tried creating sessions and keeping the IDs in memory, but they expire and result in a whole bunch of SOAP errors.
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How to Create a session in Servlet
will somone show me the code to create a session in servlet?
if a session can be created in servlet file, it can be used all the jsp files in a same web ?
Thanks!!!Session in Java web application is started by the web server itself.
In a servlet you can get the session by
HttpSession session = request.getSession();
It will return the current session associated with this request, or if the request does not have a session, creates one. -
Good morning my dear friends
can nay one explain y we are not using "new" operator to create a object for session in servlet ?Please take care, that the http protocoll is a stateless protocoll. Without special actions it is not possible to say that this request come from user x and so on.
So you have to use a session.
Create the SessionObject with the request object like this:
HttpSession session = request.getSession(true);
So, now you have a session. This session is identified by a cookie or with some additional work with the sessionid in the url.
If you don't use persistent data you don't have to know which client make the request! Is you use it then store the data with the session object.
If you really need to know the name from the client / user you have to make a login .
I hope this help
regards Dietmar -
Hi
How do I maintain a session in the scenario below:
(1) Servlet A creates a session
(2) Servlet A dispatch JSP A
(3) JSP A capture some user inputs and post to Servlet B
So far both (1) and (2) are working fine, but to get on to (3) the session is lost upon reaching Servlet B
Pls Advise...Hi mirage2000,
You mean that when you are calling the Servlet B, the request object has no session inside it's a bit strange.
Let's take the following example wich is quite simple:
Servlet A:
package servlet;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ServletA extends HttpServlet {
public void init (ServletConfig config) throws ServletException {
super.init(config);
public void doGet (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
doPost(req, res);
public void doPost (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
String nomClient = "Toto";
HttpSession session = null;
try {
session = req.getSession();
req.setAttribute("servlet.a.nom", nomClient );
getServletConfig().getServletContext().getRequestDispatcher("/jspa.jsp").forward(req, res);
} catch (Exception e) {
System.out.println("Pas cool !");
JSP A:
<%@ page import="java.util.*"%>
<% String nom = (String)request.getAttribute("servlet.a.nom"); %>
<HTML>
<HEAD><TITLE>Age ?</TITLE></HEAD>
<BODY>
<BR>
<BR>
What is your age ?
<BR>
<FORM ACTION="../servlet/ServletB" METHOD="post">
<INPUT TYPE="text" NAME="age" SIZE="3">
<BR>
<INPUT TYPE="submit" NAME="action" VALUE="SEND"> </FORM>
</BODY>
</HTML>
Servlet B:
package servlet;
import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ServletB extends HttpServlet {
public void init (ServletConfig config) throws ServletException {
super.init(config);
public void doGet (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
doPost(req, res);
public void doPost (HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
HttpSession session = null;
PrintWriter out = res.getWriter();
try {
String action = req.getParameter("action");
if (action.equals("SEND") ) {
res.setContentType(CONTENT_TYPE);
session = req.getSession();
String age = (String)req.getParameter("age");
String nomClient = (String)session.getAttribute("servlet.a.nom");
out.println("<HTML><HEAD></HEAD><BODY>");
out.println("Hello mister <B>" + nomClient + "</B>");
out.println("<BR>You are <B>" + age + "</B> years old !!");
out.println("</BODY></HTML>");
out.flush();
out.close();
} catch (Exception e) {
System.out.println("Pas cool !");
This exemple is really simple and is working perfectly on my Apache Tomcat test server.
Be more precise maybe you forgot to do some stuff.
Regards
Julien -
Disabling session management in BlazeDS
I am relatively new to BlazeDS. We are mainly using RemoteObject service of BlazeDS and server side code is not using any sessions.
Is it safe to assume that application is going to work fine if it put on multiple web servers and a HTTP load balancer is used. I saw on this post that disabling session management can not be done if message service is used but as I mentioned we are using Remote service only.
If disabling session management is fine then can you pls. elaborate how to disable it on BlazeDS.
-AmitI am relatively new to BlazeDS. We are mainly using RemoteObject service of BlazeDS and server side code is not using any sessions.
Is it safe to assume that application is going to work fine if it put on multiple web servers and a HTTP load balancer is used. I saw on this post that disabling session management can not be done if message service is used but as I mentioned we are using Remote service only.
If disabling session management is fine then can you pls. elaborate how to disable it on BlazeDS.
-Amit -
Hi,
How to disable session cache for particular reports
thanksHi,
I would like to know, what you are referring to as 'Session Cache' here. I think you are referring to the presentation server cache, which can be managed by tags in the instanceconfig.xml or you could by-pass in completely during analysis creation with the 'By Pass Presentation Services Cache' setting.
Instanceconfig.xml tags are as follows:
<ServerInstance>
<Cache>
<Query>
<MaxEntries>100</MaxEntries>
<MaxExpireMinutes>60</MaxExpireMinutes>
<MinExpireMinutes>10</MinExpireMinutes>
<MinUserExpireMinutes>10</MinUserExpireMinutes>
</Query>
</Cache>
<ServerInstance>
Let me know, if I got you wrong here.
Hope this helps.
Thank you,
Dhar -
Problem with Sessions in Servlets
Hi,
I'm having a problem with sesions with servlets. It seems that if someone logs into my website, which is running on all servlets, while another person is logged on, the second person gets the session of the first person.
I'm using
HttpSession session = request.getSession(true);to get the session in each page. The session contains a user object which shows if the user is logged in and what permissions.
The session should be unique to the client computer right? Or am I jsut screwing this up big time?Yes, each client will have their own session. However, you may be testing incorrectly:
In Firefox, for example, all instances of the application running on the same machine will share the same cookies, therefore the same session, and would be considered one client.
MS IE will do the same if you use File - New to open a new wondow rather than clicking on the desktop icon.
If the different clients are using different machines and still getting shared data, then you may be using class-level variables in the servlet, which would not be thread safe and could lead to your problems...
public class MyServlet extends HttpServlet {
String data; //bad
int moredata; //bad
public void doGet(...) ... { ... }
} -
How to disable mxml/swf servlet ?
I want to know if it is possible to disable mxmlservlet and
swfservlet, I compile all my mxml files in eclipse, mxml compiler
only wastes memory for me, for the other one I'm not even sure what
it does at all. Is it possible to turn them off ? I've tried to
comment mappings & servlet definitions in web.xml. But I could
not start application after.
I'm running Tomcat 5.5You can control the code in the child.swf from the main.swf
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Hi
I am trying to write a servlet to monitor the sessions in a weblogic server
at a point in time.
Here is my situation:
1. We are running a server clustered with three other weblogic server
instances.
2. My code looks like this:
HttpSession ses = req.getSession(true);
HttpSessionContext ctx = ses.getSessionContext();
for(Enumeration e = ctx.getIds(); e.hasMoreElements();)
String id = (String) e.nextElement();
HttpSession curSession = ctx.getSession(id);
if(curSession == null)
System.out.println("AdminSessionServlet: Null session
continue");
continue;
long creationL = curSession.getCreationTime();
3. When I run this without clustering, it works great. I get a list of
sessions, the creation time, last accessed time etc.
4. When clustered, the curSession (from ctx.getSession(id)) always comes
back as null.
5. I did some poking around only to find that the id that I get looks like a
long number (for example: -3435089287746960634 ).
Has anybody run into such a problem? Any idea how I can get it to work?
thanks,
Srikanth Meenakshi
[email protected]
I have to talk the relevant developer. I know exactly what's happening. Since
JavaOne is going on, we are spending time at the conference. I will try to get
back to you this week if not, it will be early next week.
- Prasad
Srikanth Meenakshi wrote:
> Thanks for the reply.
>
> 1. I used the Servlet api from here:
>
> http://jserv.javasoft.com/products/java-server/documentation/webserver1.1/ap
> idoc/javax.servlet.http.HttpSessionContext.html#_top_
>
> which did not say that the methods are deprecated. I did look at the latest
> spec and they are deprecated. However, since the solution I have works in
> non-clustered environment, I am wondering what I need to do to make it work
> in a clustered environment.
>
> 2.
>
> >
> > You are poking into internal stuff. I suggest you not to do that.
>
> The only poking around I did was to print out the id (String) that I
> received from a public method in a public API. As in,
>
> for(Enumeration e = ctx.getIds(); e.hasMoreElements();)
> {
> String id = (String) e.nextElement();
> System.out.println("the id is: " + id);
> }
>
> Thanks,
>
> Srikanth
>
> "Prasad Peddada" <[email protected]> wrote in message
> news:[email protected]...
> > First of all you are using deprecated api method. Those methods will
> return null
> > in the near future.
> >
> > Srikanth Meenakshi wrote:
> >
> > > Hi
> > >
> > > I am trying to write a servlet to monitor the sessions in a weblogic
> server
> > > at a point in time.
> > >
> > > Here is my situation:
> > >
> > > 1. We are running a server clustered with three other weblogic server
> > > instances.
> > >
> > > 2. My code looks like this:
> > >
> > > HttpSession ses = req.getSession(true);
> > > HttpSessionContext ctx = ses.getSessionContext();
> > >
> > > for(Enumeration e = ctx.getIds(); e.hasMoreElements();)
> > > {
> > > String id = (String) e.nextElement();
> > > HttpSession curSession = ctx.getSession(id);
> > >
> > > if(curSession == null)
> > > {
> > > System.out.println("AdminSessionServlet: Null
> session
> > > continue");
> > > continue;
> > > }
> > > long creationL = curSession.getCreationTime();
> > > .........
> > > }
> > >
> > > 3. When I run this without clustering, it works great. I get a list of
> > > sessions, the creation time, last accessed time etc.
> > >
> > > 4. When clustered, the curSession (from ctx.getSession(id)) always comes
> > > back as null.
> > >
> > > 5. I did some poking around only to find that the id that I get looks
> like a
> > > long number (for example: -3435089287746960634 ).
> >
> > You are poking into internal stuff. I suggest you not to do that.
> >
> > - Prasad
> >
> >
> > >
> > > Has anybody run into such a problem? Any idea how I can get it to work?
> > >
> > > thanks,
> > >
> > > --
> > >
> > > Srikanth Meenakshi
> > > [email protected]
> >
-
Coldfusion Update 9,0,1,274733 disables session
Installed CF 9 and left all settings at default @ WindowsXP 32 bit with No Problems
Installed CF 9.0.1 and run very simple index.cfm with Application.cfc with:
xxxxxxx cut xxxxxxxxxxxxxxxxxx
this.sessionmanagement = true;
this.sessiontimeout = CreateTimeSpan( 0, 0, 1, 0 );
xxxxxxx / cut xxxxxxxxxxxxxxxxxx Results in:
java.lang.NullPointerException
Debugging Information
ColdFusion Server Developer 9,0,1,274733
Template /walk/index.cfm
Time Stamp 25-Nov-10 10:18 PM
Locale English (UK)
User Agent Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.6 (KHTML, like Gecko) Chrome/6.0.495.0 Safari/534.6
No top level page was found.
Commenting out session vars gets rid of error
The session vars are enabled in CF Admin
BUT - trying to view log files in CF Admin produces this error below
========================================================================
The requested scope session has not been enabled.
Before session variables can be used, the session state management system must be enabled using the cfapplication tag.
The error occurred in _searchloglogic.cfm: line 29
-1 : Unable to display error's location in a CFML template.
Resources:
Check the ColdFusion documentation to verify that you are using the correct syntax.
Search the Knowledge Base to find a solution to your problem.
Browser Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.6 (KHTML, like Gecko) Chrome/6.0.495.0 Safari/534.6
Remote Address 127.0.0.1
Referrer http://127.0.0.1/CFIDE/administrator/logging/index.cfm
Date/Time 25-Nov-10 10:31 PM
Stack Trace
at cf_searchloglogic2ecfm1272957748.runPage(E:\cf9_final\cfusion\wwwroot\CFIDE\administrator \logviewer\_searchloglogic.cfm:29) at cfsearchlog2ecfm333999345.runPage(E:\cf9_final\cfusion\wwwroot\CFIDE\administrator\logvie wer\searchlog.cfm:48)
coldfusion.runtime.NoOperScope$ScopeDisabledException: The requested scope session has not been enabled.
at coldfusion.runtime.NoOperScope.resolveName(NoOperScope.java:36)
at coldfusion.runtime.Scope.get(Scope.java:60)
at coldfusion.runtime.DotResolver.resolve(DotResolver.java:45)
at coldfusion.runtime.DotResolver.resolve(DotResolver.java:72)
at coldfusion.runtime.NeoPageContext.SymTab_resolveSplitName(NeoPageContext.java:1017)
at coldfusion.runtime.NeoPageContext.SymTab_resolveDottedName(NeoPageContext.java:995)
at coldfusion.runtime.NeoPageContext.findAttribute(NeoPageContext.java:649)
at coldfusion.runtime.NeoPageContext.findAttribute(NeoPageContext.java:622)
at coldfusion.runtime.CfJspPage._checkParam(CfJspPage.java:2939)
at coldfusion.runtime.CfJspPage.checkSimpleParameter(CfJspPage.java:3012)
at cf_searchloglogic2ecfm1272957748.runPage(E:\cf9_final\cfusion\wwwroot\CFIDE\administrator \logviewer\_searchloglogic.cfm:29)
===============================================================
Server Details
Server Product ColdFusion
Version 9,0,1,274733
Edition Developer
Operating System Windows XP
OS Version 5.1
Adobe Driver Version 4.0 (Build 0005)
Type COOKIE
Description Client based text file.
Purge data after time limit Yes
Time limit 10 days
Disable global updates No
Memory Variables
J2EE Sessions No
Application Variables
Enable Application Variables Yes
Default Timeout 1,0,0,0
Maximum Timeout 2,0,0,0
Session Variables
Enable session variables Yes
Default Timeout 0,0,1,0
Maximum Timeout 0,0,2,0
================================================
I have tweaked time out settings and set J2ee settings on/off and installed chf9000001 hotfix
Tried same on Windows 7 32 bit/64 bit
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
EDIT--- Ubuntu Server 64bit works
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I have not seen this reported anywhere else.
The settings say session is enabled - even looked in neo-runtime.xml - very carefully
very discouraged ... must be dementia kicking inHello Kai
Thanks for response
Same problem on
Windows XP SP3
Windows 7 32bit/64bit
Application.cfc /cfm
Error is consistent @ all applications
Same code @ Ubuntu server runs fine ?????
Been all over this thing
This all @ Vbox installs
* @displayname "walk"
* @hint "Application Component for walk test App"
* @output "no"
component {
// application settings
this.name = "walk";
this.applicationtimeout = createTimeSpan(0,2,0,0);
// below = Null Pointer Error!
//this.sessionmanagement = true;
//this.sessiontimeout = createTimeSpan(0,1,0,0);
this.clientstorage = "cookie";
this.clientmanagement = true;
The Error on the Log file viewer in Coldfusion Administrator
========================================================================
The requested scope session has not been enabled.
Before session variables can be used, the session state management system must be enabled using the cfapplication tag.
The error occurred in _searchloglogic.cfm: line 29
-1 : Unable to display error's location in a CFML template.
Resources:
Check the ColdFusion documentation to verify that you are using the correct syntax.
Search the Knowledge Base to find a solution to your problem.
Browser Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.6 (KHTML, like Gecko) Chrome/6.0.495.0 Safari/534.6
Remote Address 127.0.0.1
Referrer http://127.0.0.1/CFIDE/administrator/logging/index.cfm
Date/Time 28-Nov-10 09:29 PM
Stack Trace
at cf_searchloglogic2ecfm1272957748.runPage(E:\cf9_final\cfusion\wwwroot\CFIDE\administrator \logviewer\_searchloglogic.cfm:29) at cfsearchlog2ecfm333999345.runPage(E:\cf9_final\cfusion\wwwroot\CFIDE\administrator\logvie wer\searchlog.cfm:48)
==================================================================================
This from install CF 9.0 runs OK
Update to 9.01 @ build 9,0,1,274733
Started CF @ 4.5 - went away @ CF 7
Came back to this - thinking of taking up knitting
Just trying to update my skillset a bit
G -
Concurrent access to JMS session in servlet
We have a servlet that accepts a request from a browser,
retrieves info from the request, places it in a JMS message and
then sends the msg to a JMS Queue. We create all the JMS
objects (connection, session, etc.) at init time (all these
objects have class scope). There is only one session and I was
wondering because servlets are multithreaded, while a request is
being handled for one client, if there is a context switch in
the middle of that client's send in order to handle another
client's request, two different threads will be accessing the
same session concurrently. I know the spec advises against
this. Am I thining too much on this one????? All I have to do
is synchronize the send call however I was just wondering if it
was truely necessary.
How are other people doing this out there?
Let me know,
Mark
Hi Mark,
You are definitely not thinking too much on this one! Multi-threading
session access is unsafe and is definitely against spec. Either
synchronize
access, or, if performance is an issue, make sure each simultaneous
sender has its
own session.
The WebLogic JMS Performance white paper on dev2dev.bea.com
contains an example of a producer pool that looks like it should map
well to your use case.
Tom, BEA
Mark Drifdon wrote:
> We have a servlet that accepts a request from a browser,
> retrieves info from the request, places it in a JMS message and
> then sends the msg to a JMS Queue. We create all the JMS
> objects (connection, session, etc.) at init time (all these
> objects have class scope). There is only one session and I was
> wondering because servlets are multithreaded, while a request is
> being handled for one client, if there is a context switch in
> the middle of that client's send in order to handle another
> client's request, two different threads will be accessing the
> same session concurrently. I know the spec advises against
> this. Am I thining too much on this one????? All I have to do
> is synchronize the send call however I was just wondering if it
> was truely necessary.
> How are other people doing this out there?
>
> Let me know,
> Mark
-
The Problem..
I have a login web-page which requests a username and password. The fields are then checked by a servlet which queries an Access Database. If the username and password are valid, the servlet redirects the browser to the main option page.
I can create a new session in the Login Servlet which stores the username and password, but when the browser moves to the main options page, how do I recover the data (using a different servlet) that was added to the session object during the login procedure. For example, say Fred Smith logged in on the login page, when the browser is redirected to the main options page I want to print "Hello Fred Smith", presumably this information can be recovered from the session object that was created in the login servlet.
Can anyone help? Thanks very much,
Andy.Hi manalar, thanks for the reply,
I tried this but I'm just getting a null reference returned. This is the code that I'm using in the login servlet:
String username = req.getParameter( "Username" );
// from the textbox on the web-page
HttpSession session = req.getSession(true);
// create a new session
session.putValue("Logon.ok", username);
and this is the code in my other servlet:
HttpSession session = req.getSession(true);
Object test = session.getValue("Logon.ok");
String testString = (String) test;
testString is assigned a null value, any ideas?
Thanks in advance,
Andy -
Disable Session Serialization Warning
I have the following warning when I try to run the web application in Weblogic
8.1.
<Warning> <HTTP Session>...<Web application: ServletContext(id=26627631...tried
to place a non-serializable attribute: entry_point into the session...This attribute
will be lost upon redeployment. This message is logged only once per session.>
Does anyone know how to disable this sesssion serialization warning in the Weblogic
log file?
Thans
Min
I think there is a bug with WebLogic 8.1 SP2 where you can not suppress this message from the Server log file although the log level is set to Error.
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when i awaken from a suspend to disk i don't want to have to log in....
is there any way to disable it? i know this seems like a simple question... but help?im using kdemod and maybe session lock was not the proper term...
it's like a plasma login screen (it uses my plasma theme anyways) that forces me to log in. i mean i can still get in... it is just an annoyance.
here is the ouiput:
dmesg | grep resume -i
Command line: root=/dev/disk/by-uuid/8d9b5e49-d8c2-40c1-974b-3c850ea10366 resume=/dev/sda8 ro
Kernel command line: root=/dev/disk/by-uuid/8d9b5e49-d8c2-40c1-974b-3c850ea10366 resume=/dev/sda8 ro
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