ATTENTION: Local Exception Stack:  
Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.3.2.v20111125-r10461): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLSyntaxErrorException: ORA-02049: temporisation : la transaction distribuée attend un verrou
Error Code: 2049
Call: UPDATE MANAGE SET END_DATE = ? WHERE (((ID_HOST = ?) AND (BEGIN_DATE = ?)) AND (EMPLOYEE = ?))
 bind => [4 parameters bound]
Query: UpdateObjectQuery(com.agarik.operia.orm.Manage2@1b55825)
 at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:324)
 at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeDirectNoSelect(DatabaseAccessor.java:840)
 at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeNoSelect(DatabaseAccessor.java:906)
 at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:592)
 at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:535)
 at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:1717)
 at org.eclipse.persistence.sessions.server.ClientSession.executeCall(ClientSession.java:253)
 at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:207)
 at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:193)
 at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.updateObject(DatasourceCallQueryMechanism.java:749)
 at org.eclipse.persistence.internal.queries.StatementQueryMechanism.updateObject(StatementQueryMechanism.java:432)
 at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.updateObjectForWriteWithChangeSet(DatabaseQueryMechanism.java:1042)
 at org.eclipse.persistence.queries.UpdateObjectQuery.executeCommitWithChangeSet(UpdateObjectQuery.java:84)
 at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.executeWriteWithChangeSet(DatabaseQueryMechanism.java:287)
 at org.eclipse.persistence.queries.WriteObjectQuery.executeDatabaseQuery(WriteObjectQuery.java:58)
 at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:844)
 at org.eclipse.persistence.queries.DatabaseQuery.executeInUnitOfWork(DatabaseQuery.java:743)
 at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWorkObjectLevelModifyQuery(ObjectLevelModifyQuery.java:108)
 at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWork(ObjectLevelModifyQuery.java:85)
 at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2871)
 at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1516)
 at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1498)
 at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1449)
 at org.eclipse.persistence.internal.sessions.CommitManager.commitChangedObjectsForClassWithChangeSet(CommitManager.java:265)
 at org.eclipse.persistence.internal.sessions.CommitManager.commitAllObjectsWithChangeSet(CommitManager.java:128)
 at org.eclipse.persistence.internal.sessions.AbstractSession.writeAllObjectsWithChangeSet(AbstractSession.java:3799)
 at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabase(UnitOfWorkImpl.java:1415)
 at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.commitToDatabase(RepeatableWriteUnitOfWork.java:636)
 at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithPreBuiltChangeSet(UnitOfWorkImpl.java:1561)
 at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.writeChanges(RepeatableWriteUnitOfWork.java:447)
 at org.eclipse.persistence.internal.jpa.EntityManagerImpl.flush(EntityManagerImpl.java:780)
 at org.eclipse.persistence.internal.jpa.EJBQueryImpl.performPreQueryFlush(EJBQueryImpl.java:1298)
 at org.eclipse.persistence.internal.jpa.EJBQueryImpl.executeReadQuery(EJBQueryImpl.java:434)
 at org.eclipse.persistence.internal.jpa.EJBQueryImpl.getSingleResult(EJBQueryImpl.java:773)
 at....rdbms.RDBMSEquipmentDAO.getEquipment(RDBMSEquipmentDAO.java:45)
 at ...s.RDBMSManageDAO.stopManage(RDBMSManageDAO.java:117)
 at ....monitoring.manage.ManageBean.stopManage(ManageBean.java:473)

@Stateless(
@TransactionAttribute(value = TransactionAttributeType.SUPPORTS)
public class ManageBean{
 
   @TransactionAttribute(value = TransactionAttributeType.REQUIRED)
   public void stopManage(){
       manageDAO.stopManage();
   }
 
}
 
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
public class RDBMSManageDAO{
    @PersistenceContext
    private EntityManager em;
    @Inject
    private EquipmentDAO hostDAO;
 
    public void stopManage(){
         Host host = hostDAO.getEquipment(manage.getEquipment());
    }
}
 
import javax.inject.Inject;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
public abstract class RDBMSEquipmentDAO{
       @PersistenceContext
 private EntityManager em;
       public Host getEquipment(String equipment) throws DAOException
 {
  Query query = em.createNamedQuery(...
  try
  {
   return (Host)query.getSingleResult();// DEBUT DE LA STACK D'ERREUR    
     
  }
  catch (NoResultException e)
  {
   return null;
  }
 }
}