Problem while running EJB client

Question

my TaxClient program caught an exception when i issued this command:
java -classpath %J2EE_HOME%\lib\system\cloudutil.jar;%J2EE_HOME%\lib\cloudscape\RmiJdbc.jar;%J2EE_HOME%\lib\system\cloudscape.jar;%J2EE_HOME%\lib\j2ee.jar;TaxClient.jar;. TaxClient
the exception look like this:
java.lang.ClassCastException
at com.sun.corba.se.internal.javax.rmi.PortableRemoteObject.narrow(Porta
bleRemoteObject.java:296)
at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)
at TaxClient.main(TaxClient.java:13)
and this is my client code:
import bmp.*;
import java.util.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
public class TaxClient {
public static void main(String[] args) {
try {
Context initial = new InitialContext();
Object objRef = initial.lookup("MyTaxBean");
TaxHome home = (TaxHome) PortableRemoteObject.narrow(objRef, TaxHome.class);
Tax tax = null;
tax = home.create("IL", 5.00f);
tax = home.create("CA", 6.25f);
tax = home.create("FL", 8.50f);
tax = home.create("CO", 6.75f);
tax = home.findByPrimaryKey("CA");
System.out.println("CA tax rate: " + tax.getTaxRate());
System.out.println("Changing tax rate for CA state");
tax.setTaxRate(8.25f);
System.out.println("New CA tax rate: " + tax.getTaxRate());
Collection taxArray = home.findInRange(5.0f, 7.0f);
Iterator it = taxArray.iterator();
while (it.hasNext()) {
Object objRef2 = it.next();
tax = (Tax)PortableRemoteObject.narrow(objRef2, Tax.class);
System.out.println("Tax Rate in " + tax.getPrimaryKey() + ": "
+ tax.getTaxRate());
tax.remove();
} catch (Exception ex) {
System.err.println("Caught an exception.");
ex.printStackTrace();
anyone who know what is problem pls help. i'm using win2k, j2sdk 1.3.1_02 and j2ee1.3.1. thanks

Answer 1

yeah its run. some problem with the deployer descriptor. but problem occured again when i try to run the client for the second time it throws exception:
java.rmi.ServerException: RemoteException occurred in server thread; nested exce
ption is:
java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: O
bject state could not be saved; nested exception is:
javax.ejb.EJBException: Object state could not be saved
java.rmi.RemoteException: nested exception is: javax.ejb.EJBException: Object st
ate could not be saved; nested exception is:
javax.ejb.EJBException: Object state could not be saved
javax.ejb.EJBException: Object state could not be saved
<<no stack trace available>>
why it runs for the first time but not for the second?