java - org.hibernate.StaleStateException:Batch update returned unexpected row count from update [0]; actual row count: 0; expected: 1 -

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when trying update key fields in database problem comes using session.flush() , session.clear() methods.

bean.java

sessionfactory sf = hibernateutil.getsessionfactory();         session s = sf.opensession();         criteria crit3=s.createcriteria(roletable.class);         roledata=crit3.list();         for(roletable rt:roledata){         transaction tx = s.begintransaction();         roletable rot=new roletable();         rot.setsno(1);         rot.setobtype(rt.getobtype());         rot.setobid(rt.getobid());         rot.settext(rt.gettext());         rot.setsdat(rt.getsdat());         rot.setedat(rt.getedat());         rot.setupdate(rt.isupdate());         rot.setcreate(rt.iscreate());         rot.setdelete(rt.isdelete());         rot.setread(rt.isread());         s.update(rot);         s.flush();         s.clear();         tx.commit();          }         s.close();         sf.close();     }

it because commit transaction after flushing session, change sequence of below:

tx.commit();   s.flush(); s.clear();

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