[jboss-user] [EJB 3.0] - Implementing business-logic: ConcurrentModificationException
Hi all,
I use a stateless session-bean to implement the business-logic to save entity-beans. The
stateless session-bean uses injection of the entitymanager as follows:
| @Stateless(mappedName = "PersonDAO")
| public class PersonDAO extends DAOBasicOperationsAbstractClass<Person>
implements PersonDAOInterfaceLocal, PersonDAOInterfaceRemote{
| @PersistenceContext(unitName = "texaco", type =
PersistenceContextType.TRANSACTION)
| EntityManager em;
|
Before saving the "Person"-entitybean, I'd like to do some checks by
executing a native read-query in a separate method on the same table (join with other
ones) where I'd like to save the Person:
| Query query=em.createNativeQuery(
| querystring
| );
|
| query.setParameter("TELEPHONENUMBER_1",
person.getPhonenumber1()==null?"K":person.getPhonenumber1().getPhoneNumber());
| query.setParameter("TELEPHONENUMBER_2",
person.getPhonenumber2()==null?"K":person.getPhonenumber2().getPhoneNumber());
| query.setParameter("GSMNUMBER_1",
person.getGsmnumber1()==null?"K":person.getGsmnumber1().getPhoneNumber());
| query.setParameter("GSMNUMBER_2",
person.getGsmnumber2()==null?"K":person.getGsmnumber2().getPhoneNumber());
| if (update) query.setParameter("ID", person.getId());
| Collection<Person> pers_coll=executeMultipleResultQuery(query);
| if (pers_coll.size()>0) return false;
| else return true;
|
If this method returns true, the new person will not be saved, otherwise he will be saved
as follows:
| if (!checkPhoneNumberValidity(person, true)) throw new PersonValidationException();
| Person person_orig=findById(person.getId());
| if (!person_orig.equals(person)){
| person_orig.getLatestValidPersonProperty().getValidityinterval().invalidate();
| person.getLatestValidPersonProperty().setValidityinterval(new ValidityInterval(new
GregorianCalendar(), new GregorianCalendar(2099, 12, 12)));
| person.getLatestValidPersonProperty().setId(null);
| person_orig.getPersonproperties().add(person.getLatestValidPersonProperty());
| person_orig.setName(person.getName());
| person_orig.setFirstname(person.getFirstname());
| person_orig.setNationalregisternumber(person.getNationalregisternumber());
| person_orig.setIdentitycardnumber(person.getIdentitycardnumber());
| person_orig.setBirthdate(person.getBirthdate());
| person_orig.setSex(person.getSex());
| person_orig.deepValidate();
| executeMerge(em, person_orig);
| }
|
Please note, I also make some comparisons with the original object as I work with
properties. In this scenario, I get a ConcurrentModificationException. Seems logic to me,
but how to solve this in a proper way, because the checks must happen within the same
transaction.
Any help or advice is very appreciated!
Best regards,
Davy.
View the original post :
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4138436#...
Reply to the post :
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...