The hellowworld-mdb quickstart added in JBIDE-14940 references these URLs:

The application will be running at the following URL: <http://localhost:8080/jboss-as-helloworld-mdb/> and will send some messages to the queue.

To send messages to the topic, use the following URL: <http://localhost:8080/jboss-as-helloworld-mdb/HelloWorldMDBServletClient?topic>

The correct URLS are:

The application will be running at the following URL: <http://localhost:8080/helloworld-mdb/> and will send some messages to the queue.

To send messages to the topic, use the following URL: <http://localhost:8080/helloworld-mdb/HelloWorldMDBServletClient?topic>