Help in creating simple statefull EJB program

Hello , i m new to EJB and right now i m developing statefull ejb application. I have created stateless ejb application and it was working well but now facing some problem with maintaining state in statefull ejb application.
Here i m simply developing one counter application ... what i have done is as below ....
============================ CounterBean ================
package ejb;
import javax.annotation.PostConstruct;
import javax.ejb.Stateful;
@Stateful (mappedName="ejb/CounterBean")
public class CounterBean implements CounterBeanRemote {
private int _count;
@PostConstruct
public void initialize()
_count = 0;
public int increment() {
_count++;
return _count;
=================Remote interface for CounterBean==========================
package ejb;
import javax.ejb.Remote;
@Remote
public interface CounterBeanRemote {
public int increment();
=========================index.jsp===================jsp page to get result from ejb ========
<%@page contentType="text/html" pageEncoding="UTF-8" import="ejb.CounterBeanRemote,javax.naming.InitialContext"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<%!
CounterBeanRemote _CBR = null;
%>
<%
InitialContext _IC = new InitialContext();
CBR = (CounterBeanRemote) IC.lookup("ejb/CounterBean");
out.println(_CBR.increment());
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>
===============================================================
so, here every time i refresh my page counter should be increase as i m using statefull bean ...
but its not happening ....
every time i refresh page, all time result coming is only 1 ... its not incrementing .... can any one tell me what i m doing wrong ..... i m not able to maintain state ....
thnks .... please reply ....

The issue is not where to put the lookup code. The issue is that each call to InitialContext.lookup() produces a new Stateful session bean instance. It's the reference that is returned from lookup() that represents the interaction with a particular client. You'll need to store that reference somewhere across the multiple client interactions in order to maintain the statefulness you're looking for. Typically, that means storing it within the HttpSession.
--ken

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* Dictionary.java
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zoemayne wrote:
java:26: cannot find symbol
symbol : method add(java.lang.String)
location: class Dictionary
add(toAdd);this is in the dictionary class
generic messageThat's because there is no add(...) method in your Dictionary class: the add(...) method is in your WordList class.
To answer your next question "+how do I add things to my list then?+": Well, you need to create an instance of your WordList class and call the add(...) method on that instance.
Here's an example of instantiating an object and invoking a method on that instance:
Integer i = new Integer(6); // create an instance of Integer
System.out.println(i.toString()); // call it's toString() method and display it on the "stdout"

Need help to run The First EJB program

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j2ee.jar;secondClient.jar client
Exception in thread "main" java.lang.NoSuchMethodError: loadClass0
at com.sun.corba.ee.internal.util.JDKClassLoader.specialLoadClass(Native
Method)
at com.sun.corba.ee.internal.util.JDKClassLoader.loadClass(JDKClassLoade
r.java:58)
at com.sun.corba.ee.internal.util.JDKBridge.loadClassM(JDKBridge.java:18
0)
at com.sun.corba.ee.internal.util.JDKBridge.loadClass(JDKBridge.java:83)
at com.sun.corba.ee.internal.javax.rmi.CORBA.Util.loadClass(Util.java:37
8)
at javax.rmi.CORBA.Util.loadClass(Unknown Source)
at javax.rmi.PortableRemoteObject.createDelegateIfSpecified(Unknown Sour
ce)
at javax.rmi.PortableRemoteObject.<clinit>(Unknown Source)
at com.sun.enterprise.naming.SerialContext.getProvider(SerialContext.jav
a:57)
at com.sun.enterprise.naming.SerialContext.<init>(SerialContext.java:79)
at com.sun.enterprise.naming.SerialInitContextFactory.getInitialContext(
SerialInitContextFactory.java:54)
at javax.naming.spi.NamingManager.getInitialContext(Unknown Source)
at javax.naming.InitialContext.getDefaultInitCtx(Unknown Source)
at javax.naming.InitialContext.init(Unknown Source)
at javax.naming.InitialContext.<init>(Unknown Source)
at client.main(client.java:10)
pls give me a solution
thank you

1. which app server u r using ? R u using RI ?
2. what is this secondclient.jar ?
3. Have u added server specific jar containing implementation of IntialConrtextFactory in the classpath of client?
4. If using RI, then I suppose u will have to set "Support Client Choice" (Possibly) to true, then generate client.jar.
5. Which IDE u r using (If any) ?
6. Are u sure that ur jar file (containng EJBs) deployed successfully ?
7. Almost every server provides GUI console sort of , u can check whether it was deployed successfuly ?
Pls update
GiveMeJ
Sanjeev

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Oops, forgot one more check. If a file exists with the same name as the original file, then it will error when you duplicate it. One way to solve that is to duplicate in place. Then "copy" is added to the name. You then move the file to the destination folder and probably there is no file with "copy" in its name.
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gl,

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weblogic.servlet.jsp.CompilationException: Compilation of C:\bea\WEBLOG~1\samples\domains\workshop\.\cgServer\.wlnotdelete\extract\cgServer__appsdir_qweb_war_qweb\jsp_servlet\__test.java failed.
at weblogic.servlet.jsp.JspStub.compilePage(JspStub.java:446)
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Compilation of 'C:\bea\WEBLOG~1\samples\domains\workshop\.\cgServer\.wlnotdelete\extract\cgServer__appsdir_qweb_war_qweb\jsp_servlet\__test.java' failed:
C:\bea\WEBLOG~1\samples\domains\workshop\.\cgServer\.wlnotdelete\extract\cgServer__appsdir_qweb_war_qweb\jsp_servlet\__test.java:17: package com.qwert does not exist
probably occurred due to an error in /test.jsp line 2:
pageEncoding="ISO-8859-1"%>
C:\bea\WEBLOG~1\samples\domains\workshop\.\cgServer\.wlnotdelete\extract\cgServer__appsdir_qweb_war_qweb\jsp_servlet\__test.java:127: cannot resolve symbol
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C:\bea\WEBLOG~1\samples\domains\workshop\.\cgServer\.wlnotdelete\extract\cgServer__appsdir_qweb_war_qweb\jsp_servlet\__test.java:129: cannot resolve symbol
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C:\bea\WEBLOG~1\samples\domains\workshop\.\cgServer\.wlnotdelete\extract\cgServer__appsdir_qweb_war_qweb\jsp_servlet\__test.java:129: cannot resolve symbol
probably occurred due to an error in /test.jsp line 14:
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Full compiler error(s):
{noformat}C:\bea\WEBLOG~1\samples\domains\workshop\.\cgServer\.wlnotdelete\extract\cgServer__appsdir_qweb_war_qweb\jsp_servlet\__test.java:17: package com.qwert does not exist
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^
C:\bea\WEBLOG~1\samples\domains\workshop\.\cgServer\.wlnotdelete\extract\cgServer__appsdir_qweb_war_qweb\jsp_servlet\__test.java:127: cannot resolve symbol
symbol : class Qwert
location: class jsp_servlet.__test
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^
C:\bea\WEBLOG~1\samples\domains\workshop\.\cgServer\.wlnotdelete\extract\cgServer__appsdir_qweb_war_qweb\jsp_servlet\__test.java:129: cannot resolve symbol
symbol : class QwertHome
location: class jsp_servlet.__test
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^
C:\bea\WEBLOG~1\samples\domains\workshop\.\cgServer\.wlnotdelete\extract\cgServer__appsdir_qweb_war_qweb\jsp_servlet\__test.java:129: cannot resolve symbol
symbol : variable QwertUtil
location: class jsp_servlet.__test
QwertHome home = QwertUtil.getHome(); //[ /test.jsp; Line: 14]
^
Please Let me Know Solution for This. Thanks in Advance.
{noformat}

Hai.
I think u didnt start the server.

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}Hope it helped

Problems with a simple stop watch program

I would appreciate help sorting out a problem with a simple stop watch program. The problem is that it throws up inappropriate values. For example, the first time I ran it today it showed the best time at 19 seconds before the actual time had reached 2 seconds. I restarted the program and it ran correctly until about the thirtieth time I started it again when it was going okay until the display suddenly changed to something like '-50:31:30:50-'. I don't have screenshot because I had twenty thirteen year olds suddenly yelling at me that it was wrong. I clicked 'Stop' and then 'Start' again and it ran correctly.
I have posted the whole code (minus the GUI section) because I want you to see that the program is very, very simple. I can't see where it could go wrong. I would appreciate any hints.
public class StopWatch extends javax.swing.JFrame implements Runnable {
 int startTime, stopTime, totalTime, bestTime;
 private volatile Thread myThread = null;
 /** Creates new form StopWatch */
 public StopWatch() {
 startTime = 0;
 stopTime = 0;
 totalTime = 0;
 bestTime = 0;
 initComponents();
 public void run() {
 Thread thisThread = Thread.currentThread();
 while(myThread == thisThread) {
 try {
 Thread.sleep(100);
 getEnd();
 } catch (InterruptedException e) {}
 public void start() {
 if(myThread == null) {
 myThread = new Thread(this);
 myThread.start();
 public void getStart() {
 Calendar now = Calendar.getInstance();
 startTime = (now.get(Calendar.MINUTE) * 60) + now.get(Calendar.SECOND);
 public void getEnd() {
 Calendar now1 = Calendar.getInstance();
 stopTime = (now1.get(Calendar.MINUTE) * 60) + now1.get(Calendar.SECOND);
 totalTime = stopTime - startTime;
 setLabel();
 if(bestTime < totalTime) bestTime = totalTime;
 public void setLabel() {
 if((totalTime % 60) < 10) {
 jLabel1.setText(""+totalTime/60+ ":0"+(totalTime % 60));
 } else {
 jLabel1.setText(""+totalTime/60 + ":"+(totalTime % 60));
 if((bestTime % 60) < 10) {
 jLabel3.setText(""+bestTime/60+ ":0"+(bestTime % 60));
 } else {
 jLabel3.setText(""+bestTime/60 + ":"+(bestTime % 60));
 private void ButtonClicked(java.awt.event.ActionEvent evt) {
 JButton temp = (JButton) evt.getSource();
 if(temp.equals(jButton1)) {
 start();
 getStart();
 if(temp.equals(jButton2)) {
 getEnd();
 myThread = null;
 * @param args the command line arguments
 public static void main(String args[]) {
 java.awt.EventQueue.invokeLater(new Runnable() {
 public void run() {
 new StopWatch().setVisible(true);
 // Variables declaration - do not modify
 private javax.swing.JButton jButton1;
 private javax.swing.JButton jButton2;
 private javax.swing.JLabel jLabel1;
 private javax.swing.JLabel jLabel2;
 private javax.swing.JLabel jLabel3;
 private javax.swing.JPanel jPanel1;
 // End of variables declaration
}

Although I appreciate this information, it still doesn't actually solve the problem. I can't see an error in the logic (or the code). The fact that the formatting works most of the time suggests that the problem does not lie there. As well, I use the same basic code for other time related displays e.g. countdown timers where the user sets a maximum time and the computer stops when zero is reached. I haven't had an error is these programs.
For me, it is such a simple program and the room for errors seem small. I am guessing that I have misunderstood something about dates, but I obviously don't know.
Again, thank you for taking the time to look at the problem and post a reply.

Need Help to create new screen for RF Sapconsole

Hi Guru's
I'm new on RF (but some years in ABAP) since last week.
I need help to create new screens for RF (SAPLLMOB).
Can someone explain me the procedure to create screen (with ABAP code after) or perhaps someone have an exemple (simple or not) ?
I have to develop 2 new screens with really few time.
And, another subsidiary question :
how SAP can transfert information between the flash gun and the screen i have developped.
Is there some code to add to enable this functionality or it is include in SAPLLMOB on standard fields ????
It's a new strange world for me today...
Many thanks to everyone who can explain me
Alain

hi,
I am facing this problem as well. Is there any reference to create the new screen?
Hope someone can help! Thanks!
Regards,
Darren

Need help to create report with jpeg/gif image

Hello,
I need help with creating a form with a special jpeg/gif seal. I never done this Java. Until now, I created all forms with ansi C++ with HP escape characters to draw lines, boxs, and text. This form will contain boxes which is populated with database information read from a text file.
Since this form contains a special seal on the upper right, I don't think it can be done with old fashion ansi C++. How can I create a form with Java and create it as a simple exe to just print the form to a specified printer.
Thanks,
John

Hi,
I am creating a form with boxes (lines and text). What is special about this form is that it has an image jpeg or gif at the top right corner. Is is a state department seal. Up to this form, I had used ansi C++ and print out escape HP character to print out the lines, boxes, and text. I have no idea how to print out the image. I am new to JAVA and only 1 class in it. Is there sample code out there to create this type of form with the image? I need a starting point.
Thanks,
John

How can I create a new EJB project ?

Hi,
I downloaded the trial version and I don't know how to create an EJB project ?
When I create a new project, I've only the web template to choose.
Where can I find informations about that ?
Thanks.
jack

Hi Jack,
This version of the Creator allows you to build applications which access existing EJB's, but doesn't create new EJB's from scratch. We are looking into that for future releases.
If you want to access an existing EJB, please see the tutorials:
http://devservices.sun.com/premium/jscreator/standard/learning/tutorials/sessionEJBcomps.pdf
I believe the Sun Java Studio Standard product can help you create EJB's today, if that's what you need:
http://developers.sun.com/prodtech/javatools/jsstandard/index.html
hth,
Val

Please help me creating a new listener with different port#.

I have two instances in a server. both have different homes. I want to create a seperate listener for the second one i created.
But that is not happening.
here i tried to give name from LISTENER TO LISTENER1 & Port# from 1521 to 1524.
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /apps2/oracle)
(PROGRAM = extproc)
LISTENER1 =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
(ADDRESS = (PROTOCOL = TCP)(HOST = aixth53)(PORT = 1524))
When I check lsnrctl status with LISTENER1 , it still shows the other instance home with port#: 1521
Please help me creating a new listener with different port#.
Thanks,

marist89 wrote:
sb92075 wrote:
marist89 wrote:
sybrand_b wrote:
The listener is a broker only and doesn't play any role in normal communications.
It just forks a process or a thread, and that's it.And the listener is a single point of failure. Listener goes down, you can't connect to the db. That's why you need two listeners.If listener one goes down, then listener two goes down for exact same reason since it is a single executable file.I'm not playing tit-for-tat with you. Fact is, there are situations where people who are not you might want to use more than one listener.Some folks might want to jab a sharp pencil into their eye, too.
Just because you can do something, it does not necessarily mean it should be done.

Help in creating simple statefull EJB program

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