Java EE (Java Enterprise Edition) General Discussion

Hi all,

I am learning JMS and so I have downloaded "Java EE SDK 5 Update 2" (available at https://sdlc5a.sun.com/ECom/EComActionServlet;jsessionid=500D73F57050D281F4B6B 5289DA3C254) and installed it on my window machine. From the package, I can use "Sun Java System Application Server" to define the necessary resources used in the JMS example programs. I have followed the instruction to create the resources before I run the example with the following output to confirm that ConnectionFactory, Queue and Topic are successfully created:

C:\temp>asadmin list-jms-resources
jms/Queue
jms/Topic
jms/ConnectionFactory
Command list-jms-resources executed successfully.

C:\temp>

However, I got NullPointerException for when I executed the Producer.java (http://java.sun.com/javaee/5/docs/tutorial/examples/jms/simple/producer/src/java/Producer.java) that the ConnectionFactory cannot be created:

@Resource(mappedName = "jms/ConnectionFactory")
private static ConnectionFactory connectionFactory;
.........................
Connection connection = connectionFactory.createConnection(); // NullPointerException here

Do you think I have sth missing to be defined or created in the "Sun Java System Application Server" or anything else?

Thanks,
Joe