You think you know what your Java code does? You don’t. The #JIT rewrites it at runtime. Harshitha Popuri & @gireeshpunam trace how bytecode turns into native optimizations inside OpenJ9.

See what actually executes in production: https://javapro.io/2026/02/18/the-runtime-illusion-what-java-really-runs/

#JVM @IBMDeveloper