JDK 11: Pitfalls for the Unwary

on YouTube ↗50m

" summary

Covers exact migration changes you must fix: the Java Platform Module System fragments rt jar so you may need jlink to build a reduced runtime, use jdeps to find module/package dependencies, or move jars to the module path as automatic modules. Calls out removed modules (CORBA, Java EE/JAX-WS/JAXB, JavaFX JVM plugin, Java Web Start), six API methods removed in JDK9, keyword changes (single underscore, var), javah replaced by javac -h, and dozens of JVM flags removed or renamed — about 50 flags can prevent startup unless you update startup scripts.

AI-written summary · about

" chapters (32)

1. 0:00Start
2. 0:24JDK 9: Big And Small Changes
3. 1:53JDK Compatibility
4. 6:37JDK 9 Onwards And Compatibility
5. 7:51Java Platform Module System (JPMS)
6. 12:01Migrating Applications to JPMS
7. 14:22Classpath v Modulepath
8. 15:17Reversing Encapsulation
9. 19:22Finding Dependencies: jdeps
10. 22:59Using "Missing" Modules
11. 23:37Milling Project Coin (JEP 213)
12. 24:47Deleted Deprecated Methods
13. 26:17Deleted Deprecated Class
14. 26:45Finding Deprecated API Use
15. 27:36JDK/JRE File Structure (JEP 220)
16. 29:48New Version String Format (JEP 223)
17. 32:36Non-Programmatic Issues
18. 34:04Removed GC Options (JEP 214)
19. 34:35JVM Logging
20. 35:19Removed JVM Flags: Ignored
21. 36:07Deprecated JVM Flags
22. 36:26JVM Flags: Non-Starters
23. 36:58Local Variable Type Inference
24. 37:45Deprecated Things Removed
25. 38:59Miscellaneous Things moved
26. 39:19Command Line Flags
27. 40:16Oracle JDK & OpenJDK
28. 41:15Major Absent Features
29. 42:47Tools Affected
30. 46:30Command Line-XX Flags
31. 47:22Migrating To JDK 11 or 12
32. 48:06Zulu Community Edition • Azuls free binary distribution of Open JDK

" related talks

• 46mJDK 9, 10 and 11: Pitfalls For The UnwarySimon Ritter · Jfokus 2019
• 47mJDK 9, 10, and 11: Pitfalls for the UnwarySimon Ritter · Oracle Code One 2018
• 49mTo JAR Hell And Back - A Live Migration to the Java 9 Module SystemNicolai Parlog · Jfokus 2018
• 46mModular Development with JDK 9 and BeyondAlex Buckley · Oracle Code One 2018
• 45mPrepare for JDK 9Alan Bateman · Devoxx Belgium 2017
• 43mEngineering a Modern Java PlatformSteve Poole · Devoxx France 2026
• 27mModern Java: Change is the Only ConstantMark Reinhold · Jfokus 2019
• 49mPreparing for JDK 9 - AKA The Sharp Edges of JDK 9Brian Goetz · Devoxx US 2017