When i ceaselessly invokeed the method findPurchaseDetailByKey() ,the following exception occur:


Hibernate version:2.1.4

Mapping documents:

Code between sessionFactory.openSession() and session.close():
public Purchaseformdetail findPurchaseDetailByKey(String id) throws SQLException {
try{
Purchaseformdetail purchaseFormDetail =(Purchaseformdetail) this.hsession.load(Purchaseformdetail.class, id);
this.hsession.flush();
return purchaseFormDetail;
}catch(HibernateException e){
throw new SQLException(e.getMessage());
}
}


Full stack trace of any exception that occurs:net.sf.hibernate.AssertionFailure: collection was not processsed by flush()

Name and version of the database you are using:MSSQL2000

Debug level Hibernate log excerpt:NO

I am not sure how to fix this problem.Hoping to see some responses.
thank you.