GriefPrevention v17.3.5 (Paper 26.1.2 Experimental)

Highlights

• Experimental support for Paper 26.1.2 (calendar-versioned Paper builds running on Java 25).
• Migrated deprecated PlayerLoginEvent to AsyncPlayerPreLoginEvent to comply with Paper 26's re-configuration API requirements.
• Thread-safe IP ban tracking for async login handling.

Paper 26.1.2 Compatibility

This release targets Paper's new calendar-versioned experimental builds (26.1.2.build.18-alpha) which require Java 25. The plugin has been verified to load and run correctly on:

• Paper: 26.1.2.build.18-alpha (Implementing API version 26.1.2.build.18-alpha)
• Java: OpenJDK 25.0.2+10-LTS (Temurin)

Event System Migration

Paper 26 deprecates listening to PlayerLoginEvent because it fires between the login and configuration phases, blocking Paper's re-configuration APIs. This release migrates to AsyncPlayerPreLoginEvent:

• Login cooldown and spam protection now run asynchronously before the configuration phase.
• IP address recording moved to PlayerJoinEvent to keep DataStore writes on the main thread.
• Smart-ban IP tracking preserved: banned accounts are still recorded for IP-based auto-banning.

Thread Safety Improvements

• tempBannedIps changed from ArrayList to CopyOnWriteArrayList to safely handle writes from the async login thread while main-thread handlers iterate the list.

Technical Changes

• paper-api dependency bumped to 26.1.2.build.18-alpha.
• Removed deprecated PlayerLoginEvent and PlayerLoginEvent.Result imports.
• Added AsyncPlayerPreLoginEvent import and handler (onAsyncPlayerPreLogin).
• Added offline-safe hasSpamBypass(UUID) helper for cooldown bypass checks (falls back to op status; permission-based bypass will be restored in a future update).

Notes

• This is an experimental build for Paper 26.1.2. For production servers on Paper 1.21.x, use the standard v17.3.5 release.
• The api-version in plugin.yml remains "1.21" for backward compatibility.
• All 108 unit tests pass on Java 25.
• No changes to claim mechanics, permissions, or commands — this is purely a compatibility update.