shmulik-klein / bazel_java_assembly

A bazel tool to build java singlejar

Bazel java assembly tools

The tool provide a way to create a java jar with all it's dependencies, but it will exclude unused deps from the jar to make it thin.

A dep jar will be in the final jar if:

1. It's used by the lib (the tools uses jdeps created by bazel to know that).
2. It's an explicit dep of the lib.

Usage

Add to your WORKSPACE file:

load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
git_repository(
    name = "java_assembly",
    remote = "https://github.com/zacharya19/bazel_java_assembly.git",
    commit = "30546e90003b272ae2d9252d3854e4ad6d0c3b16"
)

load("@java_assembly//3rdparty:workspace.bzl", "maven_dependencies")
maven_dependencies()

Add to your BUILD file:

load("@java_assembly//:assembly.bzl", "java_assembly_jar")
java_assembly_jar(
    name = "jar",
    srcs = glob(["src/main/**/*.java"]),
    deps = deps,
    main_class = "XXX.XXX.XXX"  # optional, if you want the tool to write it in the manifest file.
)

Run bazel build :jar_assembly.

The java_assembly_jar rule will create a java_library named jar with all the args, and an assembly jar named jar_assembly, so you can build both.

TODO

1. Extend the tool to build java WAR files.
2. Write tests.
3. Add an examples.
4. Better exception handling.