Question

I’m trying to run a tutorial with JMS and I have a problem. I’m using the latest Glassfish version with the latest JavaEE SDK. I’m creating a ConnectionFactory resource in the Glassfish admin console and then trying to instantiate it in the code using the following call:

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

But I’m getting the NullPointerException on the following line:

Connection connection = connectionFactory.createConnection();

How can I solve this problem? Thanks in advance.

Answer 1

I was having this problem as well while attempting to have a RESTful web service place a message onto a JMS queue.

For me, I followed this tutorial here (http://www.tricoder.net/blog/?p=128), and I needed to place an @Stateless annotation above my public class... code.

For some reason (I don’t know why, as I am totally new to this) the @Stateless is required for dependency injection to work. (It says that in the source above)

EDIT: Even with that, while developing my app, I would sometimes have the NullPointerException. Restarting Glassfish fixes the problem when that happens.