Jar Stacker

Jar Stacker v0.7.0

A major multi-version release expanding Jar Stacker support from Minecraft 1.21.1 all the way through 26.2.

Highlights

• Added full multi-version support for Minecraft 1.21.1–26.2
• 9 release artifacts covering 15 verified Minecraft runtimes
• Java 21 support for Minecraft 1.21.x
• Java 25 support for Minecraft 26.x
• Latest-entity-wins item stacking with smoother natural item motion
• Adaptive item scan cadence for responsive stacking with low overhead
• Improved logical mob state preservation
• Per-logical-member health, status effects, burn timers, and variant state
• Improved combat, sweeping, projectile, Looting, and death attribution parity
• Added persistent environmental and sunlight burn behavior
• Improved breeding, growth, wool regrowth, equipment extraction, and transformation handling
• Full in-game configuration support with optional YACL and Mod Menu integration
• Improved save/load and cross-version state preservation

Compatibility

This release supports:

• Minecraft 1.21.1
• Minecraft 1.21.2–1.21.3
• Minecraft 1.21.4
• Minecraft 1.21.5
• Minecraft 1.21.6–1.21.8
• Minecraft 1.21.9–1.21.10
• Minecraft 1.21.11
• Minecraft 26.1–26.1.2
• Minecraft 26.2

Install only the Jar Stacker file matching your Minecraft version.

Verification

• 360 / 360 automated tests passing per runtime
• 5,400 / 5,400 total server tests passing
• 15 / 15 client boot/linkage checks passing
• Minecraft 26.2 gameplay and configuration UI manually verified
• Minecraft 26.1.2 → 26.2 save upgrade verified

Notes

• Fabric API is required
• YACL and Mod Menu are optional
• Java 21 is required for Minecraft 1.21.x
• Java 25 is required for Minecraft 26.x

Please back up your world before updating Minecraft or major mod versions.