@singleton EJB Concurrency Problem When use @Lock(LockType.WRITE)
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<