java - Transactions and detach objects JPA -

good morning in timezone.

technologies : ejb 3.0 jpa provider ->(openjpa) container -> snippet of code:

@stateless(name = "ejb/beanname") public class implements ainterface{      @persistencecontext(unitname = "main")     private entitymanager emanager;      public string getdata(d d){        try{         c c = new c();         f f = emanager.find(f.class,d.getid());(1)         f.setsomedata(c);(2)         getmethodtwo(d,f);(3)         }finally{           emanager.clear();(5)            }      }      public string getmethodtwo(d d,f f){          query q = emanager.createnativequery("update ...");          q.executeupdate();(4)           }  } 

in company project , making changes snippet of code. changes creation of method "getmethodtwo" , invocation(3).the problem in pace (4) jpa throws exception because there changes on object "f" loaded through entitymanager(1), attached context, , because there changes when call executeupdate(4) jpa try run sql statements of changes on object "f".before changes , code works because there finalize clear persistence context(5).i think poor way of code. know if call entitymanager.clear() before call method work think not right solution , right way of using jpa. should ?

best regards in advance

you should flush object state db before calling update.

emanager.flush(); 

and refresh state after operation

emanager.refresh(f)