Java Database Connectivity (JDBC)

hi

MY PROJECT HAS
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EMP.JAVA(BEAN) , getters and setters id,name
EMP.HBF.XML
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create table EMP(ID varchar2(10),NAM varchar2(10),DID number)
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DEPARTMENT.JAVA(BEAN), getters and setters for did,dnam
DEP.HBF.XML
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create table EMP(DNAM varchar2(10),DID number)
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MANAGE.JAVA (main) to manage the SQL using the hibernate
HIBERNATE.CFG.XML
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actually problem that I am using many to one mapping ,were any no of emp can have one dept.i entered the values using the code(manage.java) given below
Session session =NewClass.getSessionFactory().getCurrentSession();
session.beginTransaction();
emp e = new emp();
int i = 4;
Department d = new Department();
d.setDptid(i);
System.out.println(d.getDptid());
d.setDptname("english");
e.setEid(1);
e.setEname("booom");
e.setDd(d);
session.save(d);
session.save(e);
session.getTransaction().commit();

i was able to put the values on Database ,but the ID which i am
sending not getting in the database ,,it is taking its own values
the string i put on the Database is correct only the error with the
integer i am passing

note:generator class-----native is used in xml

plz help to solve