Class Not found exception in java concurrent program

Hi All,
I done java concurrent program as per steps given by oracle.I am getting class not exception when i am submitting that concurrent program.Can any body have faced this issue?
Thanks
JK

Also go through the metalink Note:250964.1
It goes through the complete process of creating a sample java conc process and implementing it.
--Shiv                                                                                                                                                                                                                                                                                                                   

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    null

    I have created and published a EJB in Oracle 8i (in a particular
    schema) by running the deployejb tool supplied. The ejb was
    published successfully. On running the client program I get an
    error saying that the mybeans's HomeHelper class cannot be
    found. This error occurs when there is a lookup to the home
    interface of the bean. The exception thrown says Reasons are
    unknown. On checking the objects of type 'JAVA CLASS' I found
    that the homeHelper class object had been created automatically
    be the deploy process. What is the reason for the class not
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    package mituser ;
    import javax.ejb.*;
    import java.rmi.RemoteException;
    public interface MITUserHome extends EJBHome {
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    public int validatePassword (String username, String password)
    throws java.sql.SQLException, RemoteException;
    public String validateSearchAccess (String username, String
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    public void setSessionContext(SessionContext ctx) {
    this.ctx = ctx;
    public int validateUserName (String username) throws
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    int count = 0 ;
    Connection conn =
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    PreparedStatement ps =
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    try {
    ps.setString (1, username);
    ResultSet rset = ps.executeQuery ();
    if (!rset.next ())
    throw new RemoteException ("no registered user with User
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    count = rset.getShort(1) ;
    return count ;
    } finally {
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    throws SQLException, RemoteException
    int count = 0 ;
    Connection conn =
    new oracle.jdbc.driver.OracleDriver().defaultConnection ();
    PreparedStatement ps =
    conn.prepareStatement ("select count(username) from
    useraccountinfo where username = ? and password = ?");
    try {
    ps.setString (1, username);
    ps.setString(2, password);
    ResultSet rset = ps.executeQuery ();
    if (!rset.next ())
    throw new RemoteException ("Invalid Password ");
    count = rset.getShort(1) ;
    return count ;
    } finally {
    ps.close();
    public String validateSearchAccess (String username, String
    password) throws SQLException, RemoteException
    String searchaccess = "" ;
    Connection conn =
    new oracle.jdbc.driver.OracleDriver().defaultConnection ();
    PreparedStatement ps =
    conn.prepareStatement ("select searchprofileaccess from
    useraccountinfo where username = ? and password = ?");
    try {
    ps.setString (1, username);
    ps.setString(2, password);
    ResultSet rset = ps.executeQuery ();
    if (!rset.next ())
    throw new RemoteException ("Access Denied for " +
    username );
    searchaccess = rset.getString(1) ;
    return searchaccess ;
    } finally {
    ps.close();
    Client program
    import mituser.MITUser;
    import mituser.MITUserHome;
    import oracle.aurora.jndi.sess_iiop.ServiceCtx;
    import javax.naming.Context;
    import javax.naming.InitialContext;
    import java.util.Hashtable;
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    public static void main (String [] args) throws Exception {
    int count = 0 ;
    String access = "" ;
    if (args.length != 4) {
    System.out.println("usage: Client serviceURL objectName
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    String password = args [3];
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    ServiceCtx.NON_SSL_LOGIN);
    Context ic = new InitialContext(env);
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    MITUser testBean = home.create ();
    count = testBean.validateUserName("MITA");
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    System.out.println ("Valid User");
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    if (count > 0 )
    System.out.println ("Valid Password");
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    System.out.println ("Invalid Password");
    access = testBean.validateSearchAccess("MITA", "MITA");
    if ( access.equalsIgnoreCase("YES") )
    System.out.println ("Search Access Available");
    else
    System.out.println ("Search Access Denied");
    The Descriptor file
    // MIT UserBean EJB deployment descriptor
    SessionBean mituserServer.MITUserBean {
    BeanHomeName = "test/mitUserJDBCBean";
    RemoteInterfaceClassName = mituser.MITUser;
    HomeInterfaceClassName = mituser.MITUserHome;
    AllowedIdentities = {MIT};
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    @echo set ORACLE_HOME to installed Oracle home
    @echo set ORACLE_SERVICE to the CORBA service name of
    your databae
    @echo for example sess_iiop://localhost:2481:ORCL
    @echo set JDK_CLASSPATH to the full path of your JDK
    classes.zip
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    be no discussion forum for EJB
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