DayZ Inventory 1.4.0 — now on Minecraft 1.21.1

DayZ Inventory is now available for Minecraft 1.21.1 on Fabric and NeoForge.

The DayZ UI is unchanged — the Vicinity grid, Proximity Scanner, 2x2 crafting, the 2.0x Hands slot and drag-to-equip all behave exactly as they do on 1.20.1. This release is about bringing the mod to the current Minecraft version, and it took real work to get there: 1.21 was one of the largest API breaks in recent memory.

NeoForge, not Forge

The 1.21.1 build targets NeoForge. Forge does not carry forward past 1.20.x — the ecosystem moved to NeoForge — so this is a new implementation, not a port of the old Forge module. The 1.20.1 line still ships Forge as before, and both lines are maintained.

One nice consequence: NeoForge has used official Mojang names at runtime with no remapping since 1.20.2, so the refmap machinery that Forge 1.20.1 required is gone entirely.

What had to change for 1.21

These are internal, but they explain the scale of the update:

• Networking was replaced. 1.20.5+ dropped per-channel receivers and buffer-based sending in favour of typed payloads. The transport was rewritten for both loaders, and the payload class is now shared between Fabric and NeoForge.
• Item NBT became data components. ItemStack#getTag no longer exists, which affected stack comparison when picking items up from the Vicinity grid.
• Block#use was split into two methods (useItemOn and useWithoutItem), which is what the chest and barrel hooks target.
• The recipe API was reworked around RecipeHolder and CraftingInput, affecting the 2x2 crafting result.
• Several rendering and input signatures changed — screen scrolling, background rendering and the player-model render used by the Survivor panel.
• The menu-opening contract changed: Fabric now passes typed data where NeoForge still passes a buffer, so the screen handler supports both shapes.

Also in this release

• Requires Java 21 on 1.21.1 (Minecraft 1.20.5+ refuses to run on 17). The 1.20.1 build still targets Java 17.
• All optional integrations still work and remain optional: JEI / REI / EMI, Curios, and Trinkets on Fabric. The mod loads and runs fine with none of them installed.

Still on 1.20.1?

Nothing changes for you. 1.20.1 continues to be built and released for both Fabric and Forge, and will keep receiving fixes. Pick the download matching your Minecraft version.

DayZ Inventory 1.4.0 (Minecraft 1.20.1)

This is a maintenance and stability release. There are no gameplay or UI changes — the DayZ Vicinity grid, Proximity Scanner, 2x2 crafting grid, 2.0x Hands slot render and drag-to-equip panel all behave exactly as before. What changed is the build, the licensing, and the foundation the mod sits on.

Available for Minecraft 1.20.1 on Fabric and Forge.

Relicensed to Apache 2.0

DayZ Inventory is now open source under the Apache License 2.0. The previous "All Rights Reserved" terms have been removed everywhere — LICENSE, README.md, gradle.properties, build.gradle, fabric.mod.json and mods.toml.

You are now free to use, modify, redistribute and ship this mod in modpacks without asking for permission first.

Fixed: Fabric would not load

This was the significant one. The shared mixin configuration declares a refmap named dayz-inventory.refmap.json, but the Fabric build was actually producing common-refmap.json, because the mixins live in the shared common module and Loom names refmaps after the project directory.

The result was that Fabric shipped a refmap under a name nothing referenced, so every mixin failed to remap at runtime. The mod's core behaviour — blocking vanilla auto-pickup, redirecting chests and barrels into the DayZ container UI, and swapping the inventory screen — could not apply.

The Fabric refmap is now generated under the declared name and verified to contain the correct named:intermediary mappings.

Verified against a real Fabric 1.20.1 server: the mod loads, all four server mixins apply and the server starts.

Known limitation: Fabric development runs

./gradlew :fabric:runClient and :fabric:runServer start the game but do not apply mixins, so the DayZ inventory screen is not redirected in a Fabric development environment. This is a limitation of running Mixin on Fabric with Mojang official mappings, not a problem with the released mod — the packaged Fabric jar is unaffected and was verified working.

If you are developing against the GUI, use ./gradlew :forge:runClient, where mixins resolve correctly. To test Fabric behaviour, drop the built jar into a real Fabric installation.

Fixed: Forge crashed on startup

Forge was failing during Mixin application, before the game window or server console ever came up:

@Inject annotation on onPlayerTouch specifies a target class
'net/minecraft/class_1542', which is not supported

class_1542 is the intermediary name for ItemEntity. Forge runs on SRG, not intermediary, so Mixin was resolving the wrong refmap and could not apply a single mixin.

The cause was a duplicated mod classpath. The Forge project already compiled the shared common sources directly into its own output, but the shared module was also being added as a separate mod source and project dependency. That put a second copy of the mixin configs on the classpath alongside common's intermediary refmap, and Mixin picked that one up.

Forge no longer puts common on the mod classpath at all — it compiles and packages those sources itself, and ships a single refmap containing correct searge mappings. Verified against a real Forge 1.20.1 server: all four server mixins apply and the server starts.

Fixed: Forge development runs

./gradlew :forge:runClient and :forge:runServer were failing for a second, related reason. MixinGradle only injects the generated refmap into the packaged jar, never into the build output that development runs load from, so those runs fell back to the wrong refmap. The correct refmap is now copied into the Forge resources output as well.

Compatibility: optional mods degrade gracefully

JEI, REI, EMI, Trinkets and Curios remain fully optional, and the code paths that probe for them have been hardened so a missing optional dependency can never crash the game:

• Mod presence checks are now null-safe. If a probe runs before the loader has installed its platform helper, it reports "not loaded" instead of throwing.
• The chest and barrel mixins fall through to vanilla behaviour if the helper is not ready, rather than dereferencing it.
• The inventory redirect falls back to showing the vanilla inventory screen instead of crashing.

The recipe viewer button only appears when JEI, REI or EMI is actually present, and the CURIOS / TRINKETS buttons only appear when those mods are present.

Dependency metadata

• Fabric now declares fabricloader >=0.15.0 instead of requiring a single pinned loader build, and lists JEI, REI, EMI, Trinkets and Curios as suggested rather than required.
• Forge metadata adds JEI as an optional dependency and corrects the Curios load ordering.

Build and tooling

• gradlew is now committed as executable. It was previously stored non-executable, which broke ./gradlew for anyone cloning the repository.
• Removed the hardcoded Windows JDK path from gradle.properties. It pointed at one contributor's machine and made CI and other developers' builds fail. Set JAVA_HOME instead.
• Pinned Fabric Loom to 1.6.12 rather than a moving 1.6-SNAPSHOT.
• Increased the Gradle heap so the Forge toolchain stops running out of memory.

GitHub Actions

The build workflow was rewritten. It previously uploaded build/libs/, which contains no mod jars, and ran on JDK 25 against a Gradle version that does not support it.

It now runs on JDK 17, builds both loaders, uploads the Fabric and Forge jars as separate artifacts, and fails loudly if either is missing. Pushing a v* tag additionally attaches both jars to a GitHub Release.

Issue tracking

Bug reports now go to this repository's own tracker: https://github.com/aacanadaa/DayZ-Inventory/issues

The previous separate issue-tracker repository has been retired and all links in the README have been updated.

Repository housekeeping

• Removed a stray err.log and an unreferenced image that had been committed by accident.
• Rewrote .gitignore and .gitattributes so build output, run directories, logs and secrets stay out of the repository, and line endings are consistent across platforms.
• Added a CLAUDE.md documenting the multi-loader architecture and the build traps in this project.

Publishing

Modrinth and CurseForge publish tasks now derive their display names from the project version instead of hardcoding "1.3.0", so they can no longer go stale. Tokens continue to be read from the MODRINTH_TOKEN and CURSEFORGE_TOKEN environment variables — nothing is hardcoded.

DayZ Inventory 1.3.0

• Forge support restored, with Forge builds working natively (no Sinytra Connector required).
• Dependency metadata updated: Curios and Trinkets declared as optional.
• Issue tracking moved to a separate public tracker repository (since retired).

DayZ Inventory 1.2.0

• Trinkets compatibility, with a TRINKETS button in the Survivor column header that temporarily opens the vanilla inventory screen so Trinkets can initialise and render its slots.
• Curios and Trinkets buttons sit side-by-side when both are installed, and align to the right when only one is present.
• Simplified the recipe viewer toggle to simulate an O keypress (GLFW 79), the standard shortcut for toggling the JEI / REI / EMI overlay.
• Compatibility confirmed for JEI, REI, EMI, Curios and Trinkets on Minecraft 1.20.1 (Fabric and Forge), Java 17+.