hi there,

it seems you are using bean managed persistence- can your bean 
manage the null fields for persisting? if you are attempting to write 
a null field in the database you might get such errors.

greetings 

On 16 Dec 00, at 12:34, sami wrote:

this is a program example in pro java server programming j2ee edition
this is the client program
the records are inserted into the datbase but immediately afterwards 
iam getting an exception
package sportBean.bmp;
import javax.naming.*;
import java.util.*;
import javax.ejb.*;
import java.rmi.RemoteException;


public class SportClient{

	public static void main(String ar[]){
	 //team=null;
	 SportTeam team=null;
	try{
		Object ref=null;
		Properties p=new Properties();
		p.put(Context.INITIAL_CONTEXT_FACTORY,"weblogic.jndi.WLInitialContextFactory");

		p.put(Context.PROVIDER_URL,"http://localhost:7001");

		System.out.println("properties put the initial context");
		Context cc=new InitialContext(p);
		System.out.println("got the initial context");
		ref=cc.lookup("containerManaged.SportsHome");
		SportTeamHome
home=(SportTeamHome)javax.rmi.PortableRemoteObject.narrow(ref,SportTeamHome.class);

		System.out.println("home create succesfully");
		//SportTeam team=home.create("basketball","queens");
		if(home != null){

		 team=home.create("basketball","kings","joe maloof","jason williams");


	}
		System.out.println("created remote reference");
		if(team != null){
		System.out.println("current franchis player"+team.getFranchisePlayer());
		team.setFranchisePlayer("dan connor");
		System.out.println("new franchise player:"+ team.getFranchisePlayer());
	}

		Collection collection= home.findByOwnerName("joe maloof");
		Iterator iter=collection.iterator();
		if(! iter.hasNext()){
			System.out.println("found no such owner");
		}
		else{
			Object ref2=iter.next();
			SportTeam
teamRef2=(SportTeam)javax.rmi.PortableRemoteObject.narrow(ref2,SportTeam.class);

			System.out.println("owner name" +teamRef2.getOwner());
		}
		team.remove();
	}
	catch(RemoteException re){
		re.printStackTrace();
	}
	catch(NamingException re){
		re.printStackTrace();
	}
	catch(CreateException ce){
		ce.printStackTrace();
	}
	catch(RemoveException re){
		re.printStackTrace();
	}
	catch(FinderException re){
		re.printStackTrace();
	}
}
}
and this is the out put of the client

properties put the initial context
Connected successfully using http to localhost/127.0.0.1:7001
got the initial context
home create succesfully
java.rmi.UnexpectedException: Unexpected exception in
sportBean.bmp.SportTeamEJB
.create():
java.lang.NullPointerException:
        at
weblogic.ejb.internal.LockManagerImpl.unlock(LockManagerImpl.java:160
)
        at
weblogic.ejb.internal.StatefulEJBCache.unbind(StatefulEJBCache.java:5
28)
        at
weblogic.ejb.internal.BaseEJBContext.afterCompletion(BaseEJBContext.j
ava:333)
        at
weblogic.ejb.internal.EntityEJBContext.afterCompletion(EntityEJBConte
xt.java:240)
        at
weblogic.ejb.internal.StatefulEJBObject.postInvokeNoTx(StatefulEJBObj
ect.java:315)
        at
weblogic.ejb.internal.BaseEJBObject.postInvoke(BaseEJBObject.java:663
)
        at
sportBean.bmp.SportTeamEJBEOImpl.create(SportTeamEJBEOImpl.java:120)
        at
sportBean.bmp.SportTeamEJBHomeImpl.create(SportTeamEJBHomeImpl.java:4
1)
        at
sportBean.bmp.SportTeamEJBHomeImpl_WLSkel.invoke(SportTeamEJBHomeImpl
_WLSkel.java:144)
        at
weblogic.rmi.extensions.BasicServerObjectAdapter.invoke(Compiled Code
)
        at
weblogic.rmi.extensions.BasicRequestHandler.handleRequest(BasicReques
tHandler.java:69)
        at
weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest
.java:15)
        at weblogic.kernel.ExecuteThread.run(Compiled Code)
; nested exception is:
        java.lang.NullPointerException:
java.lang.NullPointerException:


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