rosjava publisher and subscriber in the same node

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If I take a single node (a class that extends AbstractNodeMain) and I include both publishers and a subscriber, the subscriber does not seem to receive any information that I publish to its topic with rostopic.

I was trying to merge both the Listener and Talker examples into a single entity that publishes using the executeCancellableLoop and subscribes to a topic with the addMessageListener method. My goal is to write a robot driver that publishes sensor data at the same time that it listens for movement commands. Can this be done?

If I avoid adding the subscriber the publisher works fine, and viceversa. If I add both things, the publisher works fine but the subscriber doesn't read any data, although the topic appears in the output of rostopic list.

I am using ROS Fuerte with the Python roscore.