Hey I m trying to evaluate pants for setting up a monorepo a Pants #general

Hey, I'm trying to evaluate pants for setting up a...

polite-city-98343

03/03/2025, 10:09 PM

Hey, I'm trying to evaluate pants for setting up a monorepo at my work. One hurdle I'm having; I need to build a java

.jar

and call it from a python script. I've got the java part built with

deploy_jar

, but there's no obvious way of combining

resource

file

relocated_files

to make it accessible from python. Any tips or help would be appreciated

elegant-florist-94385

03/03/2025, 10:12 PM

I haven't worked with this myself, but I suspect that https://www.pantsbuild.org/stable/reference/targets/experimental_wrap_as_resources may be what you need

👀 1

polite-city-98343

03/04/2025, 2:30 AM

Thanks Luke, found this based on your comment - https://github.com/pantsbuild/pants/discussions/21366

polite-city-98343

03/04/2025, 2:34 AM

Though, still not quite working - the

shell_command

doesn't find the ".jar" file generated by

deploy_jar

polite-city-98343

03/12/2025, 10:15 PM

For those who stumble back across this in future, there were some extra steps to get this working:

Copy code

shell_command(
    name="my-jar-file.command",
    command="exit 0",
    workdir="/src.jvm.com.my.namespace",
    execution_dependencies=["src/jvm/com/my/namespace:target"],
    output_files=["my-jar-file.jar"],
    outputs_match_mode="at_least_one",
    root_output_directory=".",
)
relocated_files(
    name="my-jar-file.relocated",
    files_targets=[":my-jar-file.command"],
    src="",
    dest="mypackage/mymodule",
)
experimental_wrap_as_resources(name="my-jar-file.bin", inputs=[":my-jar-file.relocated"])

polite-city-98343

03/12/2025, 10:17 PM

The key detail was using

relocated_files

with the relative path within

src/python

to my python module. Then I could resolve the file path, and execute java with

Copy code

with importlib.resources.as_file(importlib.resources.files(__name__) / "my-jar-file.jar") as my_jar_file:
   sh.java("-jar", my_jar_file, ....)

4 Views

Open in Slack

Previous Next