Prepare for JDK 9

on YouTube ↗51m

" summary

JDK 9 introduces strong encapsulation of JDK-internal APIs so code that touches those internals can break: static analysis across ~100 products shows usage of over 700 internal classes, and JEP 260 classifies many as non‑critical (to be blocked) while flagging a handful like sun.misc.Unsafe as critical. Tools include jdeps (and a Maven plugin) to find usages, there's an escape hatch via a command‑line export flag, the jdk runtime moves to a modular runtime image (no rt.jar) with a file‑system provider for tools, and six deprecated methods are slated for removal.

AI-written summary · about

" chapters (6)

1. 0:00Start
2. 23:16Uses of JDK-internal APIs
3. 26:52Example: Glassfish 4.1
4. 28:08Example: Gradle 2.7
5. 41:06New version-string format
6. 41:26System properties

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