this is the sample method in session bean in when u delete a bean

ExampleEntityHome home = (ExampleEntityHome)ejbHomeFactory.lookupHome("ExampleEntityBean",ExampleEntityHome.class);
ExampleEntity remote = home.findByPrimaryKey(1221);
remote.remove();

Container inturns calls ejbRemove() method.ejbRemove prints in server.log after that it goes to remove method of exampleDAO class then i am making header= null(to optimize memory i am making object is null);

but i am getting nullpointerexception in remove method of exampleDAO class where i am using header object

my question after completing remove method only i am making header=null; why container is calling before header = null;

it works well in oc4j server;getting problem in jboss


entity bean
public void ejbRemove()
throws javax.ejb.RemoveException
{
try
{
System.out.println("ejbRemove");
long seqno = ((Long)entityContext.getPrimaryKey()).longValue();
ExampleDAO exampleDAO = new ExampleDAO();
exampleDAO.remove(seqno,header);
this.header = null;
}

}