How can I add Java to an existing Python project? | Railway | Page 1

solar lance Nov 25, 2022, 2:22 AM

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Hey folks! I have a .jar file that I am trying to call from my python (Fastapi) project — it's not a great setup but there's no way around it. I tried using the beta feature "providers" to add Java, but I believe that's just for building the app. Does anyone have any ideas on how to get this to work?

coral citrusBOT Nov 25, 2022, 2:22 AM

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Project ID: 823ace55-3f7f-426a-827e-13063872144b

solar lance Nov 25, 2022, 2:22 AM

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823ace55-3f7f-426a-827e-13063872144b

jolly basin Nov 25, 2022, 2:23 AM

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Should be able to use https://nixpacks.com/docs/configuration/environment NIXPACKS_LIBS to add java

Environment | Nixpacks

App source + Nix packages + Docker = Image

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Try setting that variable to jdk

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We’ll make this more UI driven/better over the next bit but that’s how it is for now

solar lance Nov 25, 2022, 2:25 AM

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Awesome thank you Cooper! That would go in a railway.toml file, correct? Does the railway.toml override my existing build/run commands? i.e. do I have to specify just the NIXPACKS_LIB in the toml or any existing settings I have in the GUI as well?

jolly basin Nov 25, 2022, 2:26 AM

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You can just add it to the Variables in the service

solar lance Nov 25, 2022, 2:27 AM

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Ah I see, thank you!

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Hey Cooper, I added the env var:NIXPACKS_LIBS with a value of jdk In the build logs, there are two lines referencing jdk: ```#8 17.50 /nix/store/500hgnsk77cs40fmhmq3hv47kyvfaq69-openjdk-17.0.4+8
#8 46.28 copying path '/nix/store/500hgnsk77cs40fmhmq3hv47kyvfaq69-openjdk-17.0.4+8' from 'https://cache.nixos.org';...

However, I still get the same Python error in the deploy logs:
```FileNotFoundError: [Errno 2] No such file or directory: 'java'```
Any ideas?

jolly basin Nov 25, 2022, 2:41 AM

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Try doing NIXPACKS_LIBS instead of PKGS?

solar lance Nov 25, 2022, 2:48 AM

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That got it, thanks Cooper!

#How can I add Java to an existing Python project?