Rollforward of https://github.com/bazelbuild/bazel/commit/ad6d4d7f839687548776c7f5f79704bdb6af7d0e: Merge java_binary/java_test with launcher into a single rule

Add `//tools/build_defs/java:launcher_label_alias` target that reads native java_launcher/host_java_launcher flag. The target will be later replaced with label_flag. The implementation returns no providers, when flag is unset. Later on this can be solved, by implementing a "sentinel" launcher, that's used when the flag is unset. label_flag acts as a proper alias.

Use `//tools/build_defs/java:launcher` as default value for launcher field in Java rules, remove computed default. This replicates the previous behavior. First the value of launcher attribute is used if set. Then the value of the flag is used. If the flag is also not set, the default is used.

Handle launcher = None in the macro part. attr.label has a weird behaviour: If set to None, the default value is used (and that is a flag).

Drop additional flavours of java_binary/java_tests. They are not needed.

Update mocks for unit and integration tests

There are further cleanup of the code possible, however probably better to do them in a separate change.

NEW:
- fixed edge case where launcher is set to None
PiperOrigin-RevId: 558125242
Change-Id: I777d9116c6fcf56084b8eb80c022adbb1b347c75
11 files changed
tree: f0c7c6ffe864569248f59b8866a6966e7fbf6dab
  1. .bazelci/
  2. .github/
  3. examples/
  4. scripts/
  5. site/
  6. src/
  7. third_party/
  8. tools/
  9. .bazelrc
  10. .bazelversion
  11. .gitattributes
  12. .gitignore
  13. AUTHORS
  14. BUILD
  15. CHANGELOG.md
  16. CODE_OF_CONDUCT.md
  17. CODEOWNERS
  18. combine_distfiles.py
  19. combine_distfiles_to_tar.sh
  20. compile.sh
  21. CONTRIBUTING.md
  22. CONTRIBUTORS
  23. distdir.bzl
  24. distdir_deps.bzl
  25. extensions.bzl
  26. LICENSE
  27. maven_install.json
  28. MODULE.bazel
  29. rbe_extension.bzl
  30. README.md
  31. repositories.bzl
  32. requirements.txt
  33. SECURITY.md
  34. WORKSPACE
  35. WORKSPACE.bzlmod
README.md

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