EJB question

I am puzzled with EJB compile,I write a EJB and a client program,
EJB are following directory:
E:\EJB\orderMgmt\OrderManagement.class
E:\EJB\orderMgmt\OrderManagementBean.class
E:\EJB\orderMgmt\OrderManagementHome.class

and client is following directory:
E:\EJB\Client.java

when I compile Client.java,it raise following errors:
E:\EJB>javac -d . Client.java
Client.java:14: inconvertible types
found   : java.lang.Object
required: OrderManagementHome
                (OrderManagementHome)javax.rmi.PortableRemoteObject.narrow(
                                                                          ^
Client.java:16: cannot resolve symbol
symbol  : method create  ()
location: class OrderManagementHome
         OrderManagement orderManagement=home.create();
                                             ^
Client.java:17: cannot resolve symbol
symbol  : method placeOrder  (java.lang.String,java.lang.String,int)
location: class OrderManagement
         orderManagement.placeOrder("Cedric","J2EE Server Programming",1000);
                        ^
Client.java:18: cannot resolve symbol
symbol  : method remove  ()
location: class OrderManagement
         orderManagement.remove();
                        ^
4 errors

Why raise errors?

Then I put EJB into another directory,like following:
E:\EJB\orderMgmt\orderMgmt\OrderManagement.class
E:\EJB\orderMgmt\orderMgmt\OrderManagementBean.class
E:\EJB\orderMgmt\orderMgmt\OrderManagementHome.class
Then I compile Client.java again,this time compiled ok,why this time can compile success?
I found there are more two class in the directory of E:\EJB\orderMgmt,they are OrderManagement.class and OrderManagementHome.class. Why they will be created when I compile Client?

Thanks in advance.

My class are following:
//OrderManagementHome.java
package orderMgmt;
public interface OrderManagementHome extends javax.ejb.EJBHome{
   OrderManagement create() throws java.rmi.RemoteException,javax.ejb.CreateException;
}

//OrderManagement.java
package orderMgmt;
public interface OrderManagement extends javax.ejb.EJBObject{
   void placeOrder(String custName,String prodName,int quantity) throws java.rmi.RemoteException;
   void cancelOrder(String custName,String prodName) throws java.rmi.RemoteException;
   boolean isShipped(String custName,String prodName) throws java.rmi.RemoteException;
}

//OrderManagementBean.java
package orderMgmt;
import javax.ejb.SessionContext;
public class OrderManagementBean implements javax.ejb.SessionBean{
   public void placeOrder(String custName,String prodName,int quantity){
      System.out.println("Order placed for "+quantity+" copies of "+prodName+" to be shipped to "+custName);
   }
   public void cancelOrder(String custName,String prodName){
      System.out.println("Order cancelled");
   }
   public boolean isShipped(String custName,String prodName){
      System.out.println("Order shipped");
      return true;
   }
   public void ejbCreate(){
      System.out.println("ejbCreate() called");
   }
   public void ejbRemove(){
      System.out.println("ejbRemove() called");
   }
   public void ejbActivate(){
      System.out.println("ejbActivate() called");
   }
   public void ejbPassivate(){
      System.out.println("ejbPassivate() called");
   }
   public void setSessionContext(SessionContext ctx){
      System.out.println("setSessionContext() called");
   }
}

//Client.java
import orderMgmt.*;
import java.util.Properties;
import javax.naming.Context;
import javax.naming.InitialContext;
public class Client{
   public static void main(String args[]){
      try{
         Properties prop=new Properties();
         prop.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi;WLInitialContextFactory");
         prop.put(Context.PROVIDER_URL,"t3://localhost:7001");
         Context ctx=new InitialContext(prop);
         Object objref=ctx.lookup("OrderManagement");
         OrderManagementHome home =
                (OrderManagementHome)javax.rmi.PortableRemoteObject.narrow(
                                         objref, OrderManagementHome.class);
         OrderManagement orderManagement=home.create();
         orderManagement.placeOrder("Cedric","J2EE Server Programming",1000);
         orderManagement.remove();
      }
      catch(Exception e){
         e.printStackTrace();
      }
   }
}

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