This mod is created for modpack developers and is focused around giving extra info on Biome, Dimension and World Provider (since 1.1), Enchantment, Entity (since 1.1), and Potion IDs in your pack (and a little support with DataWatcher).

This includes following:

Outputs a list of available IDs
Outputs a list of taken IDs, followed by name and class of registered object
When at least one conflict is detected, a report with all conflicts will be generated
When a mod tries to register a new object in any entity's DataWatcher with an ID that is already taken, a detailed report will be generated in logs (or crash report if configured so), including all taken IDs at the moment of conflicting registration, followed by game crash.

Every generated file is located in IDCV folder of your minecraft installation directory.

Every file is most complete with all IDs at the moment of server start (either SP or MP) that is the moment of file generation. If any mod registers anything after that – that is out of mod scope. If the game crashes before that, either by other mod conflict detection or any other reason, no reports will be generated.

By default, any conflict will lead the game to forced stop (crash) except configured otherwise (DataWatcher ignores that config for internal reasons), in which case, it will send a warning message every 30 seconds, so you won't miss it.

This mod requires ASJCore 1.2.3.1 or higher to run!

Some technical info if something does not work:

Have you installed ASJCore as mentioned above?

This mod is modifying vanilla minecraft classes loaded at runtime (no files are changed on your disk), including removing a forced exception in Enchantment constructor. If any mod is relying on that exception (like Artifice mod) – it will be broken, so you should disable enchantment part in config.

This mod is open for suggestions on new features or improvements, so send them in comments.

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ID Conflicts Viewer