Cool? Useful? Disruptor? All of the above? IoT is having an impact on more and more industries. As the cost of instrumenting things and collecting data drops, the possibilities for what we can control and the kind of insights we can gather increase. Not only is IoT hardware cheaper and more pervasive, developing IoT software is now far more accessible. That doesn't mean there aren't tricky bits. Does Java have relevance in the IoT world? How can you keep the system reliable and handle failure in a cost-effective way? How can you cope with the data volumes? What's the best way to turn raw data into insight?