|This feature is exclusive to Java Edition.|
Obfuscation maps are Proguard mappings from old (original) names to new (obfuscated) names for classes and class members that have been renamed. They have been exported in the client.json for every snapshot since 19w36a, and the client.json for 1.14.4 has been updated slightly after 19w36a's release to include obfuscation maps as well.
Dinnerbone and Adrian Östergård have suggested that the obfuscation maps may make modding easier. Searge has implied that the obfuscation maps can replace certain third-party programs such as the Mod Coder Pack.
Third party usages
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The obfuscation maps include enough information to deobfuscate Minecraft for decompilation. Third-party programs may exist for this purpose.
According to the License, such decompiled source code is restricted to internal and reference use.
Every obfuscation map file starts with a line indicating the license of the maps.
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|September 3, 2019||Dinnerbone mentions "a small surprise for modders!" for 19w36a.|
|Upcoming Java Edition|
|1.15||19w36a||Downloads to client and server obfuscation maps are now included in client.json.|
|September 4, 2019||Dinnerbone releases obfuscation mappings for 1.14.4 as well.|
- "ProGuard manual | Usage" – Guardsquare
- "I've been pushing for this for a while, so I'm really happy that we were finally able to release the obfuscation mappings public. @SeargeDP had a great idea to release the 1.14.4 mappings as comparison, so those are going out right now." – @Dinnerbone, September 4, 2019
- "ProGuard manual | Retrace" – Guardsquare
- "Tomorrow's snapshot has a small surprise for modders! Should make one or two people happy :)" – @Dinnerbone, September 3, 2019
- "Happy modding!" – @adrian_ivl, September 4, 2019
- "This should answer the questions of everyone who kept asking about MCP updates for newer versions of Minecraft. Spoiler: there won't be any, they are finally not necessary anymore." – @SeargeDP, September 4, 2019