Well presumably we would like to change this in the future when we deprecate JDK 1.6 support, so it would be good to note that somewhere. And we'd also like to avoid someone coming along later and saying "oh, that shouldn't be hardcoded, I should change it to getLocalHost." Besides, I think it's a fair bet that someone capable of installing and maintaining Zipkin would know what the JDK is. Thoughts?