Enthuware

I did not get why option 4 is correct.

@Resource
private Queue omQueue;

By simply specifying this in my code, how do I know which JMS queue I am referring to .
I had to specify @Resource with name attribute only . Please correct me if I am missing something here ?

In no information is provided, the container injects the object that is most suitable. If there is an ambiguity, an error will occur at deployment time.
HTH,
Paul.

I did not get what do you mean when you said "most suitable object" ?

We can have any number of JMS queues present on JMS provider , how does the EJB container decide the suitability . Please elaborate ?

Also , Can you please tell me if any such thing is specified in EJB specfications ?

rkbansal83 wrote:I did not get what do you mean when you said "most suitable object" ?

We can have any number of JMS queues present on JMS provider , how does the EJB container decide the suitability . Please elaborate ?

Also , Can you please tell me if any such thing is specified in EJB specfications ?

Well, it depends on the container. Generally, the objects are injected based on their type. In case of JMS destinations, if the container is unable to figure out, it might prevent deployment or it might hookup with an object that you don't want.
The specification does not specify this behavior. That is why it is container specific.

HTH,
Paul.

Answer (a) @Resource(name="OrderManagerQueue")
public static Queue omQueue

So we can not use static for a queue inject but we can use static for @EJB injection?

To answer this question:

@Resource(name="OrderManagerQueue")
public static Queue omQueue

So we can not use static for a queue inject but we can use static for @EJB injection?

There is an EJB programming restriction that we should not use declare static field, except static final field.
Correct me if I am wrong.

That is right. static is not allowed. That is why option 1 is incorrect.

Hi Paul,

I know that its out of the scope of the exam, but could you tell how we can tell the container wich Queue to use exactly? is there an atttribute for that in the ejb-jar.xml?

Thanks in advance

Generally, the containers ( such as wsad or weblogic etc) provide a way for the deployer to tie the actual queue available in the container to the names used in the application. They have a UI for doing this.

Hi,

¿Is "static" not allowed only for "Queue"?

In the following link there is defined a "ConnectionFactory" and "Queue" using a "static variable":
https://docs.oracle.com/cd/E19798-01/82 ... index.html

@Resource(lookup = "jms/ConnectionFactory")
private static ConnectionFactory connectionFactory;

@Resource(lookup = "jms/Queue")
private static Queue queue;

Thanks in advance

Beans are not allowed to have static fields. The examples shown in your link are not beans. They are code snippets for some client code.