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[Solved] [1.12.2] Accessing files within the Mod jar


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having built my mostly client-side Mod into a jar, I soon noticed that it lost access to custom JSON and other text files I had placed in sub-folders of the resource directory.

I've tried several approaches to getting an InputStream for both file listing and reading, yet most of them - if at all - only worked when running it within the IDE. 

-> My question is: Is there a common way to read custom files shipped in the Mod jar, but not part of what belongs to actual resources (textures, models, ...).


Some of the things I've tried so far:


Stopped working once jarred (even with the target files sitting next to the class files).


Throws a java.io.FileNotFoundException and will most likely not work for iterating over folder contents either way.


Apologies if this counts more as a java question, I'm just hoping to find someone who has done this in their work here.
Thanks for your time!~


[Edit] by future Simi:

Thanks again to draco for the reference below. The ClassLoader approach seems to be working for known file locations.

I have not gotten file listings to work, but for now I will resort to naming all the files I need uniformly with just an index appended.

Have a good day!



Edited by simicats
The issue was resolved.
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What are you trying to achieve? Why are you trying to manually access files?

Some tips:


Modder Support:


1. Do not follow tutorials on YouTube, especially TechnoVision (previously called Loremaster) and HarryTalks, due to their promotion of bad practice and usage of outdated code.

2. Always post your code.

3. Never copy and paste code. You won't learn anything from doing that.



Programming via Eclipse's hotfixes will get you nowhere

5. Learn to use your IDE, especially the debugger.



The "picture that's worth 1000 words" only works if there's an obvious problem or a freehand red circle around it.

Support & Bug Reports:


1. Read the EAQ before asking for help. Remember to provide the appropriate log(s).

2. Versions below 1.11 are no longer supported due to their age. Update to a modern version of Minecraft to receive support.



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Hi David, 

For me, this mod serves as a tool for designing Buildings quickly. It works as follows:

1. You draw and arrange cuboids that specify the parts of the building. 

2. The mod goes through its collection of walls / corners / roofs / etc. to decorate the specified rooms with. 

3. Afterwards you choose or create a palette of Blocks to be used in the building.


I figured, in order to make this tool portable into whatever pack I'd like to play or share it with others,

I need the mod, all of its designs and the pre-defined block palettes shipped within the jar for convenience.


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  • Like 1

Apparently I'm a complete and utter jerk and come to this forum just like to make fun of people, be confrontational, and make your personal life miserable.  If you think this is the case, JUST REPORT ME.  Otherwise you're just going to get reported when you reply to my posts and point it out, because odds are, I was trying to be nice.


Exception: If you do not understand Java, I WILL NOT HELP YOU and your thread will get locked.


DO NOT PM ME WITH PROBLEMS. No help will be given.

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