Copying objects is a common Java programming operation that has one serious trap. Here's how to avoid copying from an object reference and only copy the instance and values you want.

Version 24 version introduces several new language features which collectively simplify code, and provide powerful tools for bytecode manipulation and advanced stream processing.

This reduces the heap size, improves deployment density, and increases data locality. Since JDK 24, compact object headers have proven their stability and performance, the proposal says.