Key Feature Comparison
Project Loom
- Virtual Threads: Greatly improve concurrent processing capability
Project Amber
- Records: Simplified data classes
- Pattern Matching: More concise code
Garbage Collection
- ZGC: Scalable low-latency garbage collector
- G1: Generational collection
Project Panama
- Foreign Function & Memory API: Better integration between Java and native code
New Features
- Structured Concurrency
- Scoped Values
Upgrade Method
“Gray verification → Performance comparison → Dependency check → Parameter hardening”
Version Matrix
| Version | Release Year | Key Features |
|---|---|---|
| Java 17 | 2021 | LTS |
| Java 21 | 2023 | Virtual Threads |
| Java 25 | 2025 | New LTS |
Error Quick Reference Card
Helps smooth migration from JDK 8/11.