Enable coverage for executing a java binary with --experimental_java_coverage.

When using --experimental_java_coverage coverage was not collected after building a java deploy jar in coverage mode and executing the corresponding binary (see Example 1 below). The identified issues:

1) JacocoCoverageRunner did not know it has to use the new implementation. It decides whether to use the new implementation based on the suffix of JACOCO_METADATA_JAR, which is unset in this case. To solve this we now set an environment variable in the java_stub_template to mark if the new implementation is used or not.

2) JarInputStream could not see the entries in the deploy jar. I fetched the entries directly from the JarFile instead.

Example 1)
bazel build --collect_code_coverage --experimental_java_coverage //java/main:main_deploy.jar
JAVA_COVERAGE_FILE=java_coverage.dat bazel-bin/java/main/main --singlejar

RELNOTES: None.
PiperOrigin-RevId: 234617047
3 files changed
tree: 817eadd352c3303f1809c6e78833fc2234c5d778
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
README.md

Bazel

{Fast, Correct} - Choose two

Build and test software of any size, quickly and reliably.

  • Speed up your builds and tests: Bazel only rebuilds what is necessary. With advanced local and distributed caching, optimized dependency analysis and parallel execution, you get fast and incremental builds.

  • One tool, multiple languages: Build and test Java, C++, Android, iOS, Go, and a wide variety of other language platforms. Bazel runs on Windows, macOS, and Linux.

  • Scalable: Bazel helps you scale your organization, codebase, and continuous integration solution. It handles codebases of any size, in multiple repositories or a huge monorepo.

  • Extensible to your needs: Easily add support for new languages and platforms with Bazel's familiar extension language. Share and re-use language rules written by the growing Bazel community.

Getting Started

Documentation

Contributing to Bazel

See CONTRIBUTING.md

Build status

Bazel is released in ‘Beta’. See the product roadmap to learn about the path toward a stable 1.0 release.