I have a table having composite primary key, which is formed using 5 columns.

Now when I try to update this table, I am unable to do so.
Can anyone plz help........

After setting the new values for the table, I used
session.saveOrUpdate(table);
tx.commit();
n then session.flush();

I get the following Exception

Exception in thread "main" org.hibernate.PropertyValueException: not-null property references a null or transient value: com.neatxs.hibernate.exchangeinstmap.Exchangeinstrumentmap.exinstname
at org.hibernate.engine.Nullability.checkNullability(Nullability.java:72)
at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:164)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:190)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:70)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:730)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:324)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:86)
at UpdateClient.saveEIMToDatabase(UpdateClient.java:124)
at UpdateClient.main(UpdateClient.java:58)

could be either of the following.

-you are trying to update an object where one of the key attributes was db generated and you haven't gotten that value yet

-one of your key values is null, or another one which is set to not allow null values

-you are trying to modify the pk values, which doesn't work. in this case you should just delete and make a new row