Using jboss jboss-3.0.6_tomcat-4.1.18 jdk1.3

following code compile completely fine packed in a jar file with META-INF\ejb-jar.xml,deployed successfully in server\default\deploy
at deployment time table created successfuly message but At runtime
i got error......

public interface HelloEntityObject extends EJBObject
{
public void setName(String name) throws RemoteException;
public String getName() throws RemoteException;
}


public interface HelloEntityHome extends EJBHome
{
public HelloEntityObject create(Integer id)
throws RemoteException,CreateException;
public HelloEntityObject findByPrimaryKey(Integer pk)
throws FinderException,RemoteException;
}


public abstract class HelloEntityBean implements EntityBean
{
public Integer id;
public String name;

public Integer ejbCreate(Integer id) throws CreateException
{ System.out.println("in ejbCreate");
this.setId(id);
return null;
}


public abstract void setId(Integer id);
public abstract Integer getId();
public abstract void setName(String name);
public abstract String getName();

public void setEntityContext(EntityContext ctx){System.out.println("in EntityContext");}
public void unsetEntityContext(){}
public void ejbPostCreate(Integer id){System.out.println("in ejbPostCreate");}
public void ejbPassivate(){}
public void ejbLoad(){}
public void ejbRemove(){}
public void ejbStore(){}

}

public class EntityClient
{
public static void main(String ar[])
{
try{
Context jndictx=new InitialContext();
System.out.println("initialContext Created");
Object ref=jndictx.lookup("HelloEntityObject");
System.out.println("in lookup");
HelloEntityHome home=(HelloEntityHome)PortableRemoteObject.narrow(ref,HelloEntityHome.class);
System.out.println("got object");
HelloEntityObject entity_1=home.create(new Integer(3));
System.out.println("object created");
entity_1.setName("EJB");
System.out.println("The Name has been set");

Integer pk=new Integer(3);
HelloEntityObject entity_2=home.findByPrimaryKey(pk);
System.out.println("The Name Is:"+entity_2.getName());

}

catch(Exception re){System.out.println(re);re.printStackTrace();}

jndi.properties file text:
==============================

java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
java.naming.provider.url=localhost:1099


ejb-jar.xml contents:
===========================
<!DOCTYPE ejb-jar PUBLIC
"-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN"
"http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
<enterprise-beans>

<ejb-name>HelloEntityObject</ejb-name>
HelloEntityHome
HelloEntityObject
<ejb-class>HelloEntityBean</ejb-class>
<persistence-type>Container</persistence-type>
<prim-key-class>java.lang.Integer</prim-key-class>
False
<abstract-schema-name>HelloEntityObject</abstract-schema-name>
<cmp-field>
<field-name>id</field-name>
</cmp-field>
<cmp-field>
<field-name>name</field-name>
</cmp-field>
<primkey-field>id</primkey-field>
<security-identity><use-caller-identity/></security-identity>

</enterprise-beans>
</ejb-jar>


Exception:
================
initialContext created
in lookup
got object
java.rmi.ServerException: RemoteException occured in server thread; nested exception is:
java.rmi.ServerException: EJBException:; nested Exception is:
javax.ejb.EJBException: null; CausedByException is: null
jboss consol exception:
===========================
INFO [STDOUT] in ejbCreate
ERROR [org.jboss.ejb.plugins.LogInterceptor] EJBException, causedBy:
java.lang.NullPointerException
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCEntityBridge.getEntityState(JDBCEntityBridge.java:598)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCEntityBridge.isCreated(JDBCEntityBridge.java:460)
at org.jboss.ejb.plugins.cmp.jdbc.bridge.JDBCAbstractCMPFieldBridge.setValue(JDBCAbstractCMPFieldBridge.java:172)
at org.jboss.ejb.plugins.cmp.bridge.EntityBridgeInvocationHandler.invoke(EntityBridgeInvocationHandler.java:126)
at org.jboss.proxy.compiler.Runtime.invoke(Runtime.java:59)
at HelloEntityBean$Proxy.setId()
at HelloEntityBean.ejbCreate(HelloEntityBean.java:14)
at java.lang.reflect.Method.invoke(Native Method)
at org.jboss.ejb.plugins.CMPPersistenceManager.createEntity(CMPPersistenceManager.java:221)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.createEntity(CachedConnectionInterceptor.java:270)
at org.jboss.ejb.EntityContainer.createHome(EntityContainer.java:731)
at java.lang.reflect.Method.invoke(Native Method)
at org.jboss.ejb.EntityContainer$ContainerInterceptor.invokeHome(EntityContainer.java:1119)
at org.jboss.ejb.plugins.AbstractInterceptor.invokeHome(AbstractInterceptor.java:73)
at org.jboss.ejb.plugins.EntitySynchronizationInterceptor.invokeHome(EntitySynchronizationInterceptor.java:207)
at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invokeHome(CachedConnectionInterceptor.java:215)
at org.jboss.ejb.plugins.AbstractInterceptor.invokeHome(AbstractInterceptor.java:73)
at org.jboss.ejb.plugins.EntityInstanceInterceptor.invokeHome(EntityInstanceInterceptor.java:90)
at org.jboss.ejb.plugins.EntityLockInterceptor.invokeHome(EntityLockInterceptor.java:79)
at org.jboss.ejb.plugins.EntityCreationInterceptor.invokeHome(EntityCreationInterceptor.java:44)
at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:111)


Command Prompt commandline access,no browser is using,
So Whats the problem,can anyone tell me........