With the recent announcement of JEP 188: Java Memory Model Update, now seems like a good time to brush up on what you know about the JMM.

Add custom triggers to start Java Flight Recorder when certain memory consumption thresholds are met. Add telemetry to your Java applications by coding custom Flight Recorder events and starting them ...

Memory alignment does matter (as shown, for example, for primitive array types in Java Tip 130), but I think it is unprofitable to chase after such low-level details.

Automatic Leak Detection: For applications in production, AppDynamics 3.0 provides real-time monitoring of Java heaps and garbage collection to automatically detect memory leaks as they happen.

Azure jaz: Automatic memory and startup optimization for Java in the cloud The new Microsoft tool for the Azure cloud aims to improve launch times for Java applications and thus reduce cloud costs.