EntityManager persist() не сохраняет данные в БД ( PostgreSQL )

При нажатии на кнопку Register должен добавляться новый пользователь в БД. Консоль выдает :

INFO [stdout] (default task-1) Hibernate: insert into public.customer (email, password, id) values (?, ?, ?)

но при этом данные не записываются (никаких ошибок нету)

сервер -WildFly 13

RegisterController класс

@Named
@RequestScoped
public class RegisterController implements Serializable {
private static final long serialVersionUID = 1L;
@PersistenceContext
private EntityManager em;
@Resource
private UserTransaction userTrans;
@Inject
private Customer customer;
public Customer getCustomer() {
    return customer;
}
public void setCustomer(Customer customer) {
    this.customer = customer;
}
public String persist() {
    try {
        userTrans.begin();
        em.persist(customer);
        userTrans.commit();
    } catch (Exception e) {
        e.printStackTrace();
    } 
    return "register";
  }
}

Customer - класс :

 @Entity
 @Table(schema="public", name = "customer")
 @NamedQuery(name = "Customer.findAll", query = "SELECT c FROM Customer c")
 public class Customer implements Serializable {
 private static final long serialVersionUID = 1L;
@Id
@SequenceGenerator(
        name="CUSTOMER_ID_GENERATOR", 
        sequenceName="seq_customer",
        schema="public",
        allocationSize=1,
        initialValue=1)
@GeneratedValue(strategy=GenerationType.SEQUENCE, 
generator="CUSTOMER_ID_GENERATOR")
private Long id;
private String email;
private String password;

@OneToMany(mappedBy = "buyer")
private Set<Item> purchases;

@OneToMany(mappedBy = "seller")
private Set<Item> offers;
public Customer() {
} ...
<геттеры и сеттеры>

persistencе.xml

<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1"
xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence 
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="online-shop">
    <class>com.java.model.Customer</class>
    <class>com.java.model.Item</class>
        <properties>
        <property name="hibernate.dialect"
             value="org.hibernate.dialect.PostgreSQLDialect"/>
        <!-- DB Dialect -->
        <property name="hibernate.hbm2ddl.auto" value="create" /> 
        <!-- create / create-drop / update -->
        <property name="hibernate.show_sql" value="true" /> 
        <!-- Show SQL in  console -->
        </properties>
    </persistence-unit>
</persistence>

Пытался добавлять em.flush(); но это не помогло.

Буду очень благодарен за помощь/совет!

data-source

       <datasource jndi-name="java:/PostgresDS" pool-name="PostgresDS">
          <connection-url>jdbc:postgresql://localhost:5432/postgresdb</connection-url>
          <driver-class>org.postgresql.Driver</driver-class>
          <driver>postgresql-42.2.4.jar</driver>
          <security>
              <user-name>postgres</user-name>
              <password>********</password>
          </security>
          <validation>
              <valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.postgres.PostgreSQLValidConnectionChecker"/>
              <background-validation>true</background-validation>
              <exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.postgres.PostgreSQLExceptionSorter"/>
          </validation>
      </datasource>