Ask HN: Best book to learn about the JVM?

I want to learn more about garbage collection tuning, common bottlenecks, how to use threads properly, the underlying implementation of the JVM and how it affects performance. I write mostly Clojure and some Java, trying to increase throughput of APIs. Looking for a more systematic learning method than trial and error through endless load tests.

https://www.youtube.com/watch?v=we_enrM7TSY this is one of the best talks on jvm and gc