Java Migration Skill

Step-by-step guide for upgrading Java projects between major versions.

When to Use

• User says "upgrade to Java 25" / "migrate from Java 8" / "update Java version"
• Modernizing legacy projects
• Spring Boot 2.x → 3.x → 4.x migration
• Preparing for LTS version adoption

Migration Paths

Java 8 (LTS) → Java 11 (LTS) → Java 17 (LTS) → Java 21 (LTS) → Java 25 (LTS)
     │              │               │              │               │
     └──────────────┴───────────────┴──────────────┴───────────────┘
                         Always migrate LTS → LTS