Is javax.servlet.http.HttpSession is Serialized

Hi All,
I just want to know, whether HTTPSession i.e., HttpSession got from HttpServletRequest is serialized?
As per my opinion its serialized.
Thanks in advance.
Pankaj Chomal

In a servlet container you obtain an object of the type implementing HttpSession. The very type can implement Serializable or not, depending on the implementation, the API does not mandate this.
As if I had seen somewhere a hint that you should only put Serializable stuff into the session, that is, that very container appears to use serialization to distribute the session information in a cluster.
What do you need?

Similar Messages

Custom Class file errors out on import javax.servlet.http.HttpSession

I am trying to write a class file to handle events. This is a test class file copied from the UIX Docs. When I put this in JDeveloper 903 ,and build it the compiler gives the error:
Error(2,27): cannot access class javax.servlet.http.HttpSession; file javax\servlet\http\HttpSession.class not found
I am not sure what is the problem? Can anyone please help?
Here is the code:--
package mypackage1;
import javax.servlet.http.HttpSession;
import oracle.cabo.servlet.Page;
import oracle.cabo.servlet.BajaContext;
import oracle.cabo.servlet.event.PageEvent;
import oracle.cabo.servlet.event.EventResult;
public class MyClass
/** This is handleStoreNameEvent version 1 */
public static EventResult handleStoreNameEvent(BajaContext context,
Page page,
PageEvent event)
String userName = event.getParameter("txt1");
HttpSession session = context.getServletRequest().getSession(true);
session.putValue("User Name", userName);
Page nextPage = new Page("NextPage");
return new EventResult(nextPage);
}

Hi, you are missing the servlet.jar file from your classpath.
In JDeveloper, you can add this by opening up your project -> libraries and adding the servlet runtime library.

Error 500: javax.servlet.http.HttpSession: method getServletContext()Ljavax

I think that I have an older version of servlet class files... is there any way to solve the following issue?
in old version, getServletContext() method isn't included in HttpSession object. is there any way to get around this problem? cuz our client has an old version... i am not sure if it's possible...
HttpSession session = e.getSession () ;
// Retreive our context so we can initialize the runtime settings.
ServletContext context = session.getServletContext () ;
i'd greatly appreciated in advance...

sorry, in e.getSession(), "e" object comes from "HttpSessionBindingEvent"

Why my servlet receives NoClassDefFoundError : javax/servlet/http/HttpSession

I developed an application which has one servlet.
The war context-root that has the servlet is 'workflowclient'.
When invoking the servlet with URL "http://localhost/workflowclient/WfAgentManagerSRMIServlet, an exception with NoClassDefFoundException is raised.
Why ?
The fortune example operates well.
Please let me know how to solve this problem.

Hi,
I would like to go through your code, if it isn't properietry, please send me the codes so that I can have a look and test at my end to provide you results.
Thanks & Regards
Ganesh .R
Developer Technical Support
Sun Microsystems
http://www.sun.com/developers/support

Package javax.servlet.http does not exist

Hello All,
A few problems here
1. My classpath doesnt seem to work.:
.;"C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib\servlet-api.jar"
2. As a result, i get many errors in my simple code, but there are still a few that are not related to javac not recognizing the servlet api.
I also tried setting the classpath at the command line (event hough its temporary)
set classpath="C:\Program Files\Apache Software Foundation\Tomcat 6.0\lib\servlet-api.jar"
but the servlet package is still not recognized
I have 2 classes, one to read the database connection details from a file and another class, my servlet.
Servlet Code:
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CustomQuery extends HttpServlet
 public void init() throws ServletException
 EstablishDBConnetion.establishConnection();
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
 response.setContentType("text/html");
 PrintWriter printer = new response.getWriter();
 String title = "Result from custom query";
 Statement stmt = EstablishDBConnetion.establishConnection.con.createStatement();
 ResultSet rs = stmt.executeQuery("select customerID from customer");
 while(rs.next())
 printer.println("<html> <head><title>" + title + "</title> <table border=\"0\"> <tr><td>" + rs.getString(1));
 rs.close();
 stmt.close();
 EstablishDBConnetion.establishConnection.con.close();
Database connection code
import java.io.*;
import java.sql.*;
import java.util.StringTokenizer;
class EstablishDBConnetion
 public static void establishConnection()
 try
 String dbDriver = "";
 String dbUrl = "";
 String dbName = "";
 String dbUser = "";
 String dbPassword = "";
 String newLine = "";
 BufferedReader fileRead = new BufferedReader(new FileReader("connection.txt"));
 boolean readerStatus = fileRead.ready();
 newLine = fileRead.readLine();
 while (readerStatus)
 StringTokenizer st = new StringTokenizer(newLine, ",");
 while (st.hasMoreTokens())
 dbDriver = st.nextToken();
 dbUrl = st.nextToken();
 dbName = st.nextToken();
 dbUser = st.nextToken();
 dbPassword = st.nextToken();
 readerStatus = fileRead.ready();
 Class.forName(dbDriver);
 String url = dbUrl + dbName;
 System.out.print(url);
 Connection con = DriverManager.getConnection(url, dbUser, dbPassword);
 catch (IOException e)
 System.out.println("IO exception in establishConnection()");
 e.printStackTrace();
 catch (java.lang.Exception ex)
 System.out.println("General exception in establishConnection()");
 ex.printStackTrace();
 public static void main(String[] args)
 //EstablishDBConnetion edbc = new EstablishDBConnetion();
 establishConnection();
}also, full error list below
CustomQuery.java:4: package javax.servlet does not exist
import javax.servlet.*;
^
CustomQuery.java:5: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
CustomQuery.java:7: cannot find symbol
symbol: class HttpServlet
public class CustomQuery extends HttpServlet
^
CustomQuery.java:10: cannot find symbol
symbol : class ServletException
location: class CustomQuery
public void init() throws ServletException
^
CustomQuery.java:16: cannot find symbol
symbol : class HttpServletRequest
location: class CustomQuery
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
^
CustomQuery.java:16: cannot find symbol
symbol : class HttpServletResponse
location: class CustomQuery
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
^
CustomQuery.java:16: cannot find symbol
symbol : class ServletException
location: class CustomQuery
public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
^
CustomQuery.java:19: package response does not exist
PrintWriter printer = new response.getWriter();
^
CustomQuery.java:24: cannot find symbol
symbol : variable establishConnection
location: class EstablishDBConnetion
Statement stmt = EstablishDBConnetion.establishConnection.con.createStatement();
^
CustomQuery.java:39: cannot find symbol
symbol : variable establishConnection
location: class EstablishDBConnetion
EstablishDBConnetion.establishConnection.con.close();
^
10 errors
I appreciate your help
Message was edited by:
paulchwd
null
Message was edited by:
paulchwd

The library is in tomcat/common/lib, not in tomcat/lib.

Javax.servlet.http.* package does not exist ?

i am using j2sdk which does not include servlets, so in the forums i found that including servlet.jar file in jdk1.6.0\jre\lib\ext javax.servlet.* was included but javax.servlet.http did not ..... now this is strange either both do not work or both work. here is the code
import javax.servlet.*;
import javax.servlet.Http.*;
class login
error is package javax.servlet.Http.*; does not exist.

Dear,
javax.servlet is one of the J2EE (Java Enterprise Edition) packages that is not included in the J2SE (Java Standard Edition) , so that one used for developing server side application.
I hope this help.
Regards.

Error: package javax.servlet.http does not exist

Hi all,
How do I import javax.servlet?
package com.example.web;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
public class BeerSelect extends HttpServlet {
public void doPost(HttpServletRequest request,
 HttpServletResponse response)
 throws IOException, ServletException {
 response.setContentType("text/html");
 PrintWriter out = response.getWrite();
 out.println ("Beer Selection Advide ");
 String c = request.getParameter("color");
 out.println (" Got beer color " + c);
}What does this error mean? The error message:
Compiling 1 source file to C:\Program Files\Apache Software Foundation\MyProjects\J2EE\build\classes
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:3:
package javax.servlet does not exist
import javax.servlet.*;
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:4:
package javax.servlet.http does not exist
import javax.servlet.http.*;
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:7:
cannot find symbol
symbol: class HttpServlet
public class BeerSelect extends HttpServlet {
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:8:
cannot find symbol
symbol : class HttpServletRequest
location: class com.example.web.BeerSelect
public void doPost(HttpServletRequest request,
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:9:
cannot find symbol
symbol : class HttpServletResponse
location: class com.example.web.BeerSelect
 HttpServletResponse response)
C:\Program Files\Apache Software Foundation\MyProjects\J2EE\src\com\example\web\BeerSelect.java:10:
cannot find symbol
symbol : class ServletException
location: class com.example.web.BeerSelect
 throws IOException, ServletException {
6 errors
BUILD FAILED (total time: 0 seconds)Thank you.

Hi,
The file servlet-api.jar / servlet.jar is not available in your classpath.
To compile an Servlet you need the jar file to be in classpath.
The jar file can be found in your webserver / application server lib folder.
Regards,
Zack

Package javax.servlet does not exist, package javax.servlet.http does not

Dear All,
I am a newbie to JAVA.
I installed JDK1.6.0_04, then NetBeans IDE 6.0
I tried compiling an example servlet, but got this error message:
package javax.servlet does not exist, package javax.servlet.http does not exist
I tried locating these packages, but in vain. I also tried setting the CLASSPATH to many values, still it did not work.
Can anyone, please, help me with this.
Should I be able to see/locate these packages, do I have to download them?
Thank you very much.

davidgoodman wrote:
Dear All,
I am a newbie to JAVA.
I installed JDK1.6.0_04, then NetBeans IDE 6.0
I tried compiling an example servlet, but got this error message:
package javax.servlet does not exist, package javax.servlet.http does not exist
What servlet/JSP engine do you plan to deploy to? Tomcat, perhaps?I think it's Tomcat (C:\Program Files\Apache Software Foundation\Apache Tomcat 6.0.14). Are there other engines that come with NetBeans IDE 6.0 (when I downloaded NetBeans, I chose ALL)
>
If so, you'll need to put the servlet JAR in your CLASSPATH. (servlet-api.jar for Tomcat 5.5 and earlier, servlet.jar for 6.0 >and later.)
I tried locating these packages, but in vain.
You won't find them until you realize that you have to deploy that servlet someplace.How to deploy?
I also tried setting the CLASSPATH to many values, still it did not work.
See above. What were you planning to set CLASSPATH to?First I set to:
C:\Program Files\Apache Software Foundation\Apache Tomcat 6.0.14\lib (because I found jar named servlet-api.jar in this folder)
Later I added this:
C:\Program Files\Java\jdk1.6.0_04\lib (out of trial-and-fail)
Finally I added some paths that lead to a library such as
C:\Program Files\glassfish-v2\lib
C:\Program Files\glassfish-v2\lib\ant\lib
Can anyone, please, help me with this.
Should I be able to see/locate these packages, do I have to download them?
You have to get a servlet/JSP engine. Step 1.Thank you for your help

Javax.servlet.http.* error

I am trying to compile a file, but got the error message "package javax.servlet.http does not exist",
"import javax.servlet.http.*"
It seems to me that this particular package is missing. how and where exactlly do I get this particular package and make it to work??
thanks

As you are using the package I assume that you're targetting a servlet engine (such as Tomcat) or a J2EE server. The package is in servlet.jar which is part of the binary release of the container that you are using.
You can download containers from the following links:
http://java.sun.com/products/servlet/index.html
http://jakarta.apache.org/tomcat/index.html

Why I got package javax.servlet.http do not exist

I have package javax.servlet.http do not exist problem, can anyone tell me why?
Thank you

Hi all
Thank you for all kinds of replies. It is Windows problems. but I got a new questions here
1) it seems I don't need to including
install_dir\common\lib\jsp-api.jar in classpath!!
2) when I try servletUtilities,
from http://www.coreservlets.com/Apache-Tomcat-Tutorial/#Configure-Tomcat
I got error
HelloServlet3.java:23: cannot resolve symbol
symbol : variable ServletUtilities
location: class coreservlets.HelloServlet3
out.println(ServletUtilities.headWithTitle(title) +
^
1 error
both my HelloServlet3 and servletUtilities under
WEB-INF\classes\coreservlets
thank you

Package javax.servlet.http does not exists

Hi,
I am new to J2EE and am writing my first servlet. I tried to compile a servlet I wrote and got the following error.
"package javax.servlet.http does not exists".
What do i do to correct this error?
Also is there any links which has a complete servlet tutorial.
Please advice
Thanx

Most probably you need to include the servlet-api library in your classpath when compiling.
You should find this file in the lib directory of your container.
It will be called servlet-api.jar (Tomcat) or j2ee.jar (Suns J2EE server) or something along those lines.
The j2ee tutorial is a decent place to start learning about servlets...
http://java.sun.com/j2ee/1.4/docs/tutorial/doc/
Good luck,
evnafets

How solve import javax.servlet.http.HttpServlet err import javax.servlet.

Hi
I am trying to compile one servlet code using commancd prompt and i get
package javax.servlet.http does not exist import javax.servlet.http.HttpServlet;
error for following code
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
public class SampleServlet extends HttpServlet
public void saveToSession(HttpServletRequest request)
String testparam = request.getParameter("testparam");
request.getSession().setAttribute("testAttribute", testparam);
please help me

Try giving servlet..jar path in the class path variable

Cannot Import javax.servlet.* and javax.servlet.http.*

Hello,
I am a University Student and now doing a project using Servlet and JSP
I have installed WinXP and Tomcat 5.0 on my computer
When I compile the servlet , there are error messages "package javax.servlet does not exist" and "package javax.servlet.http does not exist" coming out.
I have set the classpath already
i.e. %CATALINA_HOME%\common\lib\servlet-api.jar;%CATALINA_HOME%\common\lib\jsp-api.jar
( Of course "%CATALINA_HOME%" = my folder that install the Tomcat )
Can Anybody Explain what is happening and suggest a solution to me?
Please give a hand.

When you ran that command, what happened? Let javac.exe tell you the right answer.
I'd advise two things:
(1) Installing any s'ware in a directory whose name contains spaces (e.g., "Apache Software Foundation" or "Tomcat 5.0") is a very bad idea, IMO. I'd reinstall to a new directory.
(2) Your HelloServlet.java servlet probably doesn't have a package statement in it. Tomcat 5.0 won't play nicely with servlets or beans that aren't in packages. I'd add one and use the -d . option on javac.exe to make sure it created the package directory structure for me.

SAPNoClassDefFoundError: javax.servlet.http.HttpSessionListener

Hi,
I have deployed an application in to Netweaver WAS, and have given a hard reference to one of the libraries which is already deployed in the same server. But when starting the application, it gives an error telling that javax.servlet.http.HttpSessionListener is not available. I gave the servlet.jar in the classpath and still its giving the same error.
Can anyone tell me what can i do to get rid of this problem? This is the error message iam getting in the defaulttrace file:
The error is: com.sap.engine.frame.core.load.SAPNoClassDefFoundError: javax.servlet.http.HttpSessionListener

Hi Venkat
Check in the visual admin-deploy service,whether or not your application is deployed.Try to start it.
Also check out the below link
http://help.sap.com/saphelp_nw2004s/helpdata/en/1b/92e4e701b242c2833a7adde6ecad09/frameset.htm
Message was edited by:
Rajat Anand
Message was edited by:
Rajat Anand

Package javax.servlet.http

Hi,
i work whith Solaris 2.6
my java version is 1.3.0
The package javax.servlet.http is not a standard package?
Where he is?
I can download it?
look my error when i start weblogic server:
Servlet failed with Exception
java.lang.NoClassDefFoundError: javax/servlet/http/HttpServletRequest
Thanks!

Download latest version of j2ee.jar from http://java.sun.com/j2ee/index.jsp
Amar.

Is javax.servlet.http.HttpSession is Serialized

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