@ConversationScoped @Named
public class LoginBean implements Serializable{
	private static final long serialVersionUID = 1L;
	
	@Inject
 	private EntityManager em;

@SuppressWarnings("unchecked")
public Object registry(){
  UsersModel userModel=new UsersModel("NewUser");
  em.persist(userModel);
}

Caused by: javax.persistence.TransactionRequiredException: 
JBAS011469: Transaction is required to perform this operation (either use a transaction or extended persistence context)

<?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="customShop" transaction-type="JTA">
		<provider>org.hibernate.ejb.HibernatePersistence</provider>
		<jta-data-source>java:/customShopDatasource</jta-data-source>
		<class>org.customShop.entity.UsersModel</class>
		<properties>
	         <property name="hibernate.dialect" value="org.hibernate.dialect.SQLServerDialect"/>
	         <property name="hibernate.hbm2ddl.auto"  value="update"/>
	         <property name="hibernate.show_sql" value="true"/>
	         <property name="hibernate.format_sql" value="true"/>
	         <property name="jboss.entity.manager.factory.jndi.name" value="java:/customShopEntityManagerFactory"/>
	      </properties>
	</persistence-unit>
</persistence>

@SessionScoped
public class AdapterEntityManager  implements Serializable {
		private static final long serialVersionUID = 1L;

		@Produces
	    @PersistenceContext(unitName = "customShop", type = PersistenceContextType.TRANSACTION)
		private EntityManager em;
}

@Stateful

@SessionScoped 
@Named
public class LoginBean implements Serializable{
	private static final long serialVersionUID = 1L;
	
	@Inject
 	private EntityManager em;
...