This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I'm the systems programmer. Feeling much more confident, the closer I get to the hardware, I have a very extensive knowledge of the JRE on its lowest levels including instrumentation, bytecode processing, native implementation, JNA, and JNI.