In Singleton ejb 3.2  specification is :

If a method is of locking type WRITE, client access to all the singleton's methods is blocked until

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1. the current client finishes its method call

2. Or an access timeout occurs.

so, locking type WRITE method call at a time from one caller .

But my  app  -- @Lock(LockType.WRITE) method call from multiple client /thread at a  time .

problem occur :

when use @ConcurrencyManagement(ConcurrencyManagementType.CONTAINER)

my environment is :

wildfly 8.0 final , ejb3.2 , jpa2.1 ,hiberante

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@Singleton

@LocalBean

@AccessTimeout(value = 120000)

@ConcurrencyManagement(ConcurrencyManagementType.CONTAINER)

public class MySingleton {

    @PersistenceContext

    EntityManager em;

    @Lock(LockType.WRITE)

    public  void doServiceTest(AppUser appuser) {

        System.out.println("start----------------masum final test-----------------W");

        Query query = em

                .createNativeQuery("SELECT SSNO FROM app_users  WHERE  APP_USERS_PK =(SELECT MAX(APP_USERS_PK) FROM app_users)");

        String ob = (String) query.getSingleResult();

        String ivd = ob.substring(8);

        int id = Integer.valueOf(ivd);

        String testDateString = null;

        try {

            Date todaysDate = new Date();

            DateFormat df = new SimpleDateFormat("MMddyyyy");

            testDateString = df.format(todaysDate);

            id++;

            testDateString = testDateString + id;

            System.out.println("String in dd/MM/yyyy format is: "

                    + testDateString);

            appuser.setSsno(testDateString);

            em.persist(appuser);

        } catch (Exception ex) {

            System.out.println(ex);

        }

        System.out.println("End----------------masum final test-----------------W");

    }

}

Error :

Error :

(default task-3) Duplicate entry '06072014107' for key 'ssno'

(default task-3) HHH000010: On release of batch it still contained JDBC statements

ARJUNA012125: TwoPhaseCoordinator.beforeCompletion - failed for SynchronizationImple<