inside the JVM

class files, bytecode, class loaders, the interpreter and the JIT. how your code actually runs.

1. 01JVM architectureclass loaders, runtime data areas, execution engine. the whole map.
2. 02the class fileCAFEBABE, the constant pool, and every byte of a tiny .class.
3. 03bytecodea stack machine. watch the operand stack while a method runs.
4. 04the five invoke instructionsinvokestatic, virtual, interface, special, dynamic. who calls what.
5. 05class loadingload → link → initialize. and the exact moments a class gets initialized.
6. 06class loadersbootstrap, platform, app. delegation, and why two loaders = two classes.
7. 07the interpreter and the JITtiered compilation: how hot code climbs from tier 0 to C2.
8. 08JIT optimizationsinlining, escape analysis, loop tricks, and deoptimization.
9. 09object layoutjava 25+mark word, class pointer, fields, padding. and compact headers.
10. 10how locks work insidelightweight locking, inflation, and what happened to biased locking.
11. 11safepointshow the JVM stops every thread, and why your latency spiked.
12. 12AOT, Leyden and native imagesCDS, the AOT cache, and starting fast.