EJB Run Time Error!......... Plz Help Me ASAP

hi all,
i got an exception while running the client program
"java.lang.ClassCastException:ExeBean_yceoj3_HomeImpl:
the Server Program(ExeBean) are given below..
i think this above mentioned exception is related to this code
plz check this code... i am waiting for ur reply...
import javax.naming.*;
import javax.sql.*;
import java.sql.*;
import javax.ejb.*;
import java.rmi.*;
import java.lang.*;
public class ExeBean implements SessionBean
     Connection con=null;
     public void setSessionContext(SessionContext sc)
     public void ejbActivate()
     public void ejbPassivate()
     public void ejbRemove()
          try
               con.close();
          catch(Exception e)
               System.out.println(e);
     public void ejbCreate() throws CreateException, RemoteException
          try
               InitialContext ic=new InitialContext();
               DataSource d=(DataSource)ic.lookup("java:comp/env/jdbc/examples");
               con=d.getConnection();
          catch(Exception e)
               System.out.println(e);
          public boolean validate(String u, String p)throws RemoteException
               try
                    PreparedStatement p1=con.prepareStatement("Select pwd from testusers where userid=?");
                    p1.setString(1,u);
                    ResultSet rs=p1.executeQuery();
                    while(rs.next())
                         String t=rs.getString(1);
                         if(t.equals(p))
                              return true;
                         else
                              return false;
               catch(Exception e)
                    System.out.println(e);
               return false;
};

hi Thomos,
again i got same exceptions plz check the below code samples
Remote:
import javax.ejb.*;
import java.rmi.*;
public interface Exe2 extends EJBObject
     public boolean validate(String u, String p) throws RemoteException;
Home:
import javax.ejb.*;
import java.rmi.*;
public interface ExeHome extends EJBHome
     public Exe2 create() throws CreateException, RemoteException;
Server :
import javax.naming.*;
import javax.sql.*;
import java.sql.*;
import javax.ejb.*;
import java.rmi.*;
import java.lang.*;
public class ExeBean implements SessionBean
     Connection con=null;
     public void setSessionContext(SessionContext sc)
     public void ejbActivate()
     public void ejbPassivate()
     public void ejbRemove()
          try
               con.close();
          catch(Exception e)
               System.out.println(e);
     public void ejbCreate() throws CreateException, RemoteException
          try
               InitialContext ic=new InitialContext();
               DataSource d=(DataSource)ic.lookup("java:comp/env/jdbc/examples");
               con=d.getConnection();
          catch(Exception e)
               System.out.println(e);
          public boolean validate(String u, String p)throws RemoteException
               try
                    PreparedStatement p1=con.prepareStatement("Select pwd from testusers where userid=?");
                    p1.setString(1,u);
                    ResultSet rs=p1.executeQuery();
                    while(rs.next())
                         String t=rs.getString(1);
                         if(t.equals(p))
                              return true;
                         else
                              return false;
               catch(Exception e)
                    System.out.println(e);
               return false;
Client :
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.naming.*;
import javax.rmi.*;
public class Client extends JFrame
     JTextField t1=null,t2=null;
     public Client()
          Container c=getContentPane();
          c.setLayout(new FlowLayout());
          c.add(new JLabel("UserName :"));
          t1=new JTextField(15);
          c.add(t1);
          c.add(new JLabel("Password :"));
          t2=new JTextField(15);
          c.add(t2);
          JButton b =new JButton("Login");
          c.add(b);
          b.addActionListener(new MyAction());
          setSize(300,400);
     public static void main(String args[])
          new Client().setVisible(true);
     class MyAction implements ActionListener
          public void actionPerformed(ActionEvent ae)
               try
                    java.util.Hashtable h=new java.util.Hashtable();
                    h.put(Context.PROVIDER_URL,"t3://manju:7001/");
                    h.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");
                    InitialContext ic=new InitialContext(h);
                    ExeHome eh=(ExeHome)ic.lookup("jdbc/examples");
                    Exe2 e2=eh.create();
                    String u=(String)t1.getText();
                    String p=(String)t2.getText();
                    //boolean b=e2.validate(u, p);
                    System.out.println("boolean result b:"+e2.validate(u, p));
               if(e2.validate(u, p))
                         System.out.println("valid user");
                    else
                         System.out.println("invalid user");
               catch(Exception e)
                    System.out.println(e);
weblogic-ejb-jar.xml :
<?xml version="1.0"?>
<!DOCTYPE weblogic-ejb-jar PUBLIC
'-//BEA Systems, Inc.//DTD WebLogic 7.0.0 EJB//EN'
'http://www.bea.com/servers/wls700/dtd/weblogic-ejb-jar.dtd'>
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>ExeBean2</ejb-name>
<jndi-name>jdbc/examples</jndi-name>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
Ejb-jar.xml :
<?xml version="1.0"?>
<!DOCTYPE ejb-jar PUBLIC
'-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 1.1//EN'
'http://java.sun.com/j2ee/dtds/ejb-jar_1_1.dtd'>
<ejb-jar>
<enterprise-beans>
<session>
<ejb-name>ExeBean2</ejb-name>
<home>ExeHome</home>
<remote>Exe2</remote>
<ejb-class>ExeBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
<resource-ref>
                                   <res-ref-name>jdbc/examples</res-ref-name>
                                   <res-type>javax.sql.DataSource</res-type>
                                   <res-auth>Container</res-auth>
     </resource-ref>
</session>
</enterprise-beans>
</ejb-jar>
plz check these above code snippets, if any thing worng in this above code plz modify.. i am waiting for the solution..
thanks in advance
from
Sree

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Press any key to continue . . .

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    //Frame.setDefaultLookAndFeelDecorated(true);
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   //will contain two labels (name and Social Security Number) and
   //two text boxes (nameTextField and ssTextField)
   JPanel topPanel = new JPanel(new GridLayout (2, 2, 5, 5));
   JLabel nameLabel = new JLabel ("Name:");
   topPanel.add(nameLabel);
   JTextField nameTextField = new JTextField(10);
   topPanel.add(nameTextField);
   JLabel ssLabel = new JLabel ("Social Security Number:");
   topPanel.add(ssLabel);
JPasswordField ssTextField = new JPasswordField(10);
topPanel.add(ssTextField);
//Place the topPanel on the North side of the frame
Container contentPane = frame.getContentPane();
contentPane.add (topPanel, BorderLayout.NORTH);
//Create the center panel. It will be placed in the center of the
//frame. It will contain two sub panels. One sub panel will contain
//labels (Select sources of news and information and Classification).
//The second sub panel will contain check boxes and radio buttons)
JPanel centerPanel = new JPanel (new BorderLayout ());
JPanel centerTopPanel = new JPanel (new GridLayout (1, 2, 5, 5));
JLabel sourceLabel = new JLabel
             ("Select sources of news and information");
centerTopPanel.add (sourceLabel);
JLabel classLabel = new JLabel ("Classification");
centerTopPanel.add (classLabel);
centerPanel.add (centerTopPanel, BorderLayout.NORTH);
JPanel centerBottomPanel = new JPanel (new GridLayout (1, 2, 5, 5));
JPanel checkBoxPanel = new JPanel (new GridLayout (3, 1, 5, 1));
JCheckBox newspaperCheckBox = new JCheckBox ("Newspaper");
checkBoxPanel.add (newspaperCheckBox);
JCheckBox tvCheckBox = new JCheckBox ("TV");
checkBoxPanel.add (tvCheckBox);
JCheckBox friendsCheckBox = new JCheckBox ("Friends");
checkBoxPanel.add (friendsCheckBox);
centerBottomPanel.add (checkBoxPanel);
JPanel radioButtonPanel = new JPanel (new GridLayout (4, 1, 5, 1));
JRadioButton freshmanRadioButton = new JRadioButton ("Freshman");
radioButtonPanel.add (freshmanRadioButton);
JRadioButton sophomoreRadioButton = new JRadioButton ("Sophomore");
radioButtonPanel.add (sophomoreRadioButton);
JRadioButton juniorRadioButton = new JRadioButton ("Junior");
radioButtonPanel.add (juniorRadioButton);
JRadioButton seniorRadioButton = new JRadioButton ("Senior");
radioButtonPanel.add (seniorRadioButton);
centerBottomPanel.add (radioButtonPanel);
centerPanel.add (centerBottomPanel, BorderLayout.SOUTH);
contentPane.add (centerPanel, BorderLayout.CENTER);
//creation of button group deleted
//buttonPanel will contain buttons and will be placed at south side
//of the frame
JPanel buttonPanel = new JPanel(new GridLayout (1, 2, 5, 5));
JButton submitButton = new JButton ("Submit");
buttonPanel.add (submitButton);
JButton exitButton = new JButton ("Exit");
buttonPanel.add (exitButton);
contentPane.add (buttonPanel, BorderLayout.SOUTH);
}//end main
}

I do have the 1.5 at the moment and I still get the same error. I have removed other instances of JRE from my computer and retried but it still persists... What else can I do?
Java Newbie

Urgent help on this run time error LOAD_TYPEPOOL_VERSION_MISMATCH

hi i got this run time error for a stamdard transaction..can anyboby throw some light?
LOAD_TYPEPOOL_VERSION_MISMATCH
02.08.2007 21:23:11
ShrtText
Type group was changed at runtime.
What happened?
Error in ABAP application program.
The current ABAP program "SAPLCOBADI" had to be terminated because one of the
statements could not be executed.
This is probably due to an error in the ABAP program.
What can you do?
Print out the error message (using the "Print" function)
and make a note of the actions and input that caused the
error.
To resolve the problem, contact your SAP system administrator.
You can use transaction ST22 (ABAP Dump Analysis) to view and administer
termination messages, especially those beyond their normal deletion
date.
is especially useful if you want to keep a particular message.
The system attempted to correct the error
automatically, so you should try to restart
the program.
The type group "COBAI" was changed while the program was running, so that an
inconsistence occurred at runtime.
The type group "COBAI" has the version 20070627153024.
The program "%_CCOBAI" uses the version 20070802190113.
The internal session was started at 20070802212309.

Dear Ramachandran Rakhunathan ,
this special error happens, when you change a table, e.g. table AUFM. Please do not change central data structures when the system is running. Please take a look at SAP Note <a href="https://websmp230.sap-ag.de/sap(bD1lbiZjPTAwMQ==)/bc/bsp/spn/sapnotes/index2.htm?numm=162991">162991</a> for further information.
Thanks,
Hannes Kuehnemund
SAP LinuxLab

EJB Run Time Error!......... Plz Help Me ASAP

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