You’ve learned that Java objects are passed by value, meaning that a copy of the value is passed. Just remember that the copied value points to a real object in the Java memory heap.

JEP 450 (Compact Object Headers) has been targeted for delivery in JDK 24. This currently experimental feature optimizes heap utilization by shrinking the size of the mandatory object header in HotSpo ...

JVM heap analysis with Java Flight Recorder Here’s how the Java Flight Recorder’s Old Object Sample event works. When a recording is started, a fixed number of objects from the Java heap are tracked.