The tutorial needs to be updated to reflect the actual results of the steps when using Java EE 7 and GlassFish.

1) NewMessage bean uses annotation and java:app namespace to define JMS:
@JMSDestinationDefinition(name = "java:app/jms/NewMessage", interfaceName = "javax.jms.Queue", resourceAdapter = "jmsra", destinationName = "NewMessage")
@MessageDriven(activationConfig = {
    @ActivationConfigProperty(propertyName = "destinationType", propertyValue = "javax.jms.Queue"),
    @ActivationConfigProperty(propertyName = "destinationLookup", propertyValue = "java:app/jms/NewMessage")
})

2) There is no glassfish-resources.xml generated in EJB module anymore.
3) PostMessage servlet should use these resources in order to work:
@Resource(mappedName = "java:comp/DefaultJMSConnectionFactory")
private ConnectionFactory connectionFactory;

@Resource(mappedName = "java:app/jms/NewMessage")
private Queue queue;