Hibernate Data not updating in database -

i using hibernate 3 in application there 1 scenario inserting 2 record , updating 1 record :-

  sessionfactory sf = hibernateutils.getsessionfactory();         session = sf.opensession();         tx = session.begintransaction();         collection collection = session.load(collection.class, "12345");             tx.commit(); // using way getting object database.  setcollection(collection);//here setting object in 1 pojo class 

now in other function

i getting object again...

collection collection=getcollection(); //here detached 

now here first saving data in 1 table using below approach:-

 sessionfactory sf = hibernateutils.getsessionfactory();             session = sf.opensession();             tx = session.begintransaction();     sms sms=new sms();         sms.setmessage(collection.getmesage());        session.save(sms);        tx.commit();        session.flush();        session.close(); 

then updating , inserting 2 records in same session

sessionfactory sf = hibernateutils.getsessionfactory();             session = sf.opensession();             tx = session.begintransaction();     cancel cancel=new cancel();         cancel.setmessage(collection.getmesage());        session.save(cancel);        session.update(collection);        tx.commit();        session.flush();        session.close(); 

the problem in above code , here in sms , in cancel table data saving update not working , not showing error also.

its not happening in every case, sometime not updating

is there problem 2 different sessions ??

no there nothing wrong in taking 2 different session.

here happening in code:

first getting object database , closing session

collection collection=opensession(); session.load()....session.close();

then setting collection object. setcollection(collection);

now act detached object. if transaction.commit after object committed in database saving other object, doing in first part saving first object.

in second transaction there nothing update not getting updated.