[swig] How to build lightgbmlib-3.3.510.jar from source code?

[sixgodccc-tech]

Description

I try to build lightgbmlib-3.3.510.jar from LightGBM-3.3.5 source code in local, but the built lightgbmlib-3.3.510.jar miss some methods, such as new_doublePtrArray, doublePtrArray_setitem, delete_doublePtrArray, etc.

I want to know how to build a right jar in local? And, How does the official LightGBM build the lightgbmlib-3.3.510.jar?

Reproducible example

git clone --recursive --branch v3.3.5 --depth 1 https://github.com/Microsoft/LightGBM
cd LightGBM
mkdir build
cd build
cmake -DUSE_SWIG=ON ..
make -j8

Environment info

LightGBM version or commit hash: v3.3.5

Command(s) you used to install LightGBM

The docker image used to build jar is lightgbm/vsts-agent:manylinux_2_28_x86_64
swig version is 4.2.1
cmake version is 3.30.1
java version is 1.8.0.422

Additional Comments

[jameslamb]

Thanks for using LightGBM.

I've modified your post slightly to make the code snippets clearer. You may wnat to see https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax if you're new to markdown and/or GitHub.

You can see the "Build Java Wrapper" docs in the v3.3.5 documentation to learn how to build that release of LightGBM's Java support: https://lightgbm.readthedocs.io/en/v3.3.5/Installation-Guide.html#build-java-wrapper

There are similar docs there for all newer versions of LightGBM as well.

You can also look around the repo for the word "swig" (the framework we use to generate the Java bindings) to see how things are built for releases, e.g. this:

LightGBM/.ci/test.sh

Lines 56 to 57 in 33e93d6

	cmake -B build -S . -DUSE_SWIG=ON
	cmake --build build -j4 || exit 1