java - JPA, Can not delete record -

i'm trying delete multiple rows(if any) using jpa, , nullpointer exception. parameter , entity manager not null. ideas might causing exception?

p.s class annotated @transactional

@override public void removeaccount(string id) {     try {          int deleterecords = entitymanager.createquery("delete bankaccount b b.accountnumber = ?1", bankaccount.class)                 .setparameter(1, accountnumber)                 .executeupdate();      } catch (exception ex) {         ex.getmessage();     } } 

you don't have put second parameter, put class name in query. bankaccount , string id never used in method.

int deleterecords = entitymanager.createquery("delete bankaccount b b.accountnumber = ?1")                 .setparameter(1, accountnumber)                 .executeupdate();