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rules_scala_dependencies to scala/deps.bzl
Ensures we get all the versions of dependencies we want in `WORKSPACE`, while providing a new API to consumers. Part of bazelbuild#1652. Bumps several packages as high as they can go and still be compatible with Bazel 6 and 7: - `bazel_skylib`: 1.4.1 => 1.7.1 - `rules_cc`: 0.0.6 => 0.0.9 - `rules_python`: 0.36.0 => 0.38.0 - `rules_go`: 0.50.1 The following packages are at the maximum version to prevent breakages under Bazel 6.5.0. --- `abseil-cpp` and `protobuf` have to stay at 20220623.1 and v27.1, respectively, for Bazel 6 compatibility per bazelbuild#1647. `protobuf` up to v25.5 is compatible with Bazel 6 provided users set the compiler flags mentioned in that issue. --- `rules_python` 0.38.0 => 0.39.0 requires at least `rules_cc` 0.0.10, which introduced `cc/common/cc_info.bzl`: ```txt $ bazel build //{src,test,third_party,scala_proto}/... [ ...snip... ] ERROR: error loading package under directory 'test': error loading package 'test': at .../external/rules_python/python/defs.bzl:17:6: at .../external/rules_python/python/py_binary.bzl:18:6: at .../external/rules_python/python/private/py_binary_macro.bzl:16:6: at .../external/rules_python/python/private/common_bazel.bzl:19:6: Label '@rules_cc//cc/common:cc_info.bzl' is invalid because 'cc/common' is not a package; perhaps you meant to put the colon here: '@rules_cc//cc:common/cc_info.bzl'? ``` --- `rules_cc` 0.0.9 => 0.0.10 requires Bazel 7, which defines `CcSharedLibraryHintInfo`: ```txt $ bazel build //{src,test,third_party,scala_proto}/... ERROR: .../external/rules_cc/cc/private/rules_impl/native.bzl:40:33: name 'CcSharedLibraryHintInfo' is not defined (did you mean 'CcSharedLibraryInfo'?) [ ...snip... ] ERROR: error loading package under directory 'test': error loading package 'test': at .../external/rules_python/python/defs.bzl:17:6: at .../external/rules_python/python/py_binary.bzl:18:6: at .../external/rules_python/python/private/py_binary_macro.bzl:16:6: at .../external/rules_python/python/private/common_bazel.bzl:18:6: at .../external/rules_cc/cc/common/cc_common.bzl:17:6: compilation of module 'cc/private/rules_impl/native.bzl' failed ``` --- `rules_java` remains at 7.9.0 due to the more complicated situation it presents. The current version that could be compatible with Bazel 6 and 7 is 7.12.2. As it turns out, we could include `rules_java` versions up to and including 7.12.2 if we don't call the following in `WORKSPACE`: ```py load("@rules_java//java:repositories.bzl", "rules_java_dependencies", "rules_java_toolchains") rules_java_dependencies() rules_java_toolchains() ``` In fact, __we don't do that today__. When we do, Bazel 7.4.1 builds successfully, but Bazel 6.5.2 fails with: ```txt $ bazel build //{src,test,third_party,scala_proto}/... ERROR: .../external/rules_java/toolchains/java_toolchain_alias.bzl:83:34: Use of Starlark transition without allowlist attribute '_allowlist_function_transition'. See Starlark transitions documentation for details and usage: @rules_java//toolchains:java_toolchain_alias.bzl NORMAL ERROR: .../src/java/io/bazel/rulesscala/coverage/instrumenter/BUILD:3:12: While resolving toolchains for target //src/java/io/bazel/rulesscala/coverage/instrumenter:instrumenter: invalid registered toolchain '//toolchains:all': while parsing '//toolchains:all': error loading package '@rules_java//toolchains': initialization of module 'toolchains/java_toolchain_alias.bzl' failed ERROR: Analysis of target '//src/java/io/bazel/rulesscala/coverage/instrumenter:instrumenter' failed; build aborted: ``` When we bump to rules_java 7.10.0, which contains bazelbuild/rules_java#210, Bazel 7.4.1 fails with: ```txt $ bazel build //{src,test,third_party,scala_proto}/... ERROR: .../external/rules_java_builtin/toolchains/BUILD:254:14: While resolving toolchains for target @@rules_java_builtin//toolchains:platformclasspath (096dcc8): No matching toolchains found for types @@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type. To debug, rerun with --toolchain_resolution_debug='@@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type' If platforms or toolchains are a new concept for you, we'd encourage reading https://bazel.build/concepts/platforms-intro. ERROR: Analysis of target '//test/toolchains:java21_toolchain' failed; build aborted: Analysis failed ``` This is the error I described in bazelbuild#1619, under "Bump to rules_java 7.9.0 for Bazel 7 compatibility" in the message for commit cd22d88. Today I rediscovered: - bazelbuild/rules_java: Regression with @@rules_java//toolchains:bootstrap_runtime_toolchain_type in 7.10.0 bazelbuild/rules_java#214 But even worse, Bazel 6.5.0 fails with: ```txt $ bazel build //{src,test,third_party,scala_proto}/... [ ...snip... ] ERROR: .../test/src/main/resources/java_sources/BUILD:5:14: Building test/src/main/resources/java_sources/CompiledWithJava8_java.jar (1 source file) failed: Worker process did not return a WorkResponse: ---8<---8<--- Start of log, file at .../bazel-workers/multiplex-worker-18-Javac.log ---8<---8<--- Error thrown by worker thread, shutting down worker. java.lang.NoSuchMethodError: 'java.lang.Iterable com.google.devtools.build.buildjar.javac.BlazeJavacMain$ClassloaderMaskingFileManager.getJavaFileObjectsFromPaths(java.util.Collection)' at com.google.devtools.build.buildjar.javac.BlazeJavacMain.compile(BlazeJavacMain.java:142) at com.google.devtools.build.buildjar.ReducedClasspathJavaLibraryBuilder.compileSources(ReducedClasspathJavaLibraryBuilder.java:57) at com.google.devtools.build.buildjar.SimpleJavaLibraryBuilder.compileJavaLibrary(SimpleJavaLibraryBuilder.java:110) at com.google.devtools.build.buildjar.SimpleJavaLibraryBuilder.run(SimpleJavaLibraryBuilder.java:118) at com.google.devtools.build.buildjar.BazelJavaBuilder.build(BazelJavaBuilder.java:111) at com.google.devtools.build.buildjar.BazelJavaBuilder.parseAndBuild(BazelJavaBuilder.java:91) at com.google.devtools.build.buildjar.BazelJavaBuilder.lambda$main$0(BazelJavaBuilder.java:52) at com.google.devtools.build.lib.worker.WorkRequestHandler$WorkRequestCallback.apply(WorkRequestHandler.java:252) at com.google.devtools.build.lib.worker.WorkRequestHandler.respondToRequest(WorkRequestHandler.java:480) at com.google.devtools.build.lib.worker.WorkRequestHandler.lambda$startResponseThread$1(WorkRequestHandler.java:433) at java.base/java.lang.Thread.run(Thread.java:829) ---8<---8<--- End of log ---8<---8<--- ERROR: .../test/src/main/resources/java_sources/BUILD:11:14: Building test/src/main/resources/java_sources/CompiledWithJava11_java.jar (1 source file) failed: Worker process did not return a WorkResponse: ---8<---8<--- Start of log, file at .../bazel-workers/multiplex-worker-18-Javac.log ---8<---8<--- Error thrown by worker thread, shutting down worker. java.lang.NoSuchMethodError: 'java.lang.Iterable com.google.devtools.build.buildjar.javac.BlazeJavacMain$ClassloaderMaskingFileManager.getJavaFileObjectsFromPaths(java.util.Collection)' at com.google.devtools.build.buildjar.javac.BlazeJavacMain.compile(BlazeJavacMain.java:142) at com.google.devtools.build.buildjar.ReducedClasspathJavaLibraryBuilder.compileSources(ReducedClasspathJavaLibraryBuilder.java:57) at com.google.devtools.build.buildjar.SimpleJavaLibraryBuilder.compileJavaLibrary(SimpleJavaLibraryBuilder.java:110) at com.google.devtools.build.buildjar.SimpleJavaLibraryBuilder.run(SimpleJavaLibraryBuilder.java:118) at com.google.devtools.build.buildjar.BazelJavaBuilder.build(BazelJavaBuilder.java:111) at com.google.devtools.build.buildjar.BazelJavaBuilder.parseAndBuild(BazelJavaBuilder.java:91) at com.google.devtools.build.buildjar.BazelJavaBuilder.lambda$main$0(BazelJavaBuilder.java:52) at com.google.devtools.build.lib.worker.WorkRequestHandler$WorkRequestCallback.apply(WorkRequestHandler.java:252) at com.google.devtools.build.lib.worker.WorkRequestHandler.respondToRequest(WorkRequestHandler.java:480) at com.google.devtools.build.lib.worker.WorkRequestHandler.lambda$startResponseThread$1(WorkRequestHandler.java:433) at java.base/java.lang.Thread.run(Thread.java:829) ---8<---8<--- End of log ---8<---8<--- ``` In bazelbuild#1619, I thought we wanted to keep `@bazel_tools//tools/jdk:` as the canonical Java toolchains package, instead of `@rules_java//toolchains:`. But based on this comment from @fmeum, I'm inclined to believe switching to `@rules_java//toolchains:` actually is the preferred, futureproof approach: - bazelbuild/rules_java#214 (comment) --- Bazel 8 requires `rules_java` 8, per bazelbuild#1652. We can't update to `rules_java` 8 right now, unless we decided to do the following: - Tell Bazel 6 users to add C++ compiler flags to support the newer `abseil-cpp` versions required by newer `protobuf` versions. - Abandon Bazel 6 support in favor of supporting Bazel 7 at a minimum. - In addition to either of the above cases, update ScalaPB to 1.0.0-alpha.1 or higher to support `protobuf` v28. Here are the details explaining why `rules_java` 8 currently breaks. `rules_java` 8.0.0 requires Bazel >= 7.3.2, which provides the `subrule` API. Compatibility with Bazel >= 6.3.0 isn't restored until `rules_java` 8.3.2. ```txt $ bazel build //{src,test,third_party,scala_proto}/... ERROR: .../external/rules_java/java/common/rules/android_lint.bzl:142:24: name 'subrule' is not defined (did you mean 'rule'?) ERROR: Error computing the main repository mapping: at .../scala/private/extensions/dev_deps.bzl:8:6: at .../external/rules_java/java/repositories.bzl:20:6: at .../external/rules_java/toolchains/local_java_repository.bzl:17:6: at .../external/rules_java/java/defs.bzl:18:6: at .../external/rules_java/java/java_library.bzl:16:6: at .../external/rules_java/java/bazel/rules/bazel_java_library.bzl:21:6: compilation of module 'java/common/rules/android_lint.bzl' failed ``` `rules_java` 8.3.0 is broken, as it can't find its own `@compatibility_proxy` repo: ```txt $ bazel build //{src,test,third_party,scala_proto}/... ERROR: error loading package under directory 'src': error loading package 'src/protobuf/io/bazel/rules_scala': at .../external/rules_java/java/defs.bzl:22:6: at .../external/rules_java/java/java_test.bzl:16:6: Unable to find package for @compatibility_proxy//:proxy.bzl: The repository '@compatibility_proxy' could not be resolved: Repository '@compatibility_proxy' is not defined. ``` `rules_java` 8.3.1 seems to fix this, presumably by importing the `protobuf` repo as `com_google_protobuf`. However, it now requires at least `protobuf` v27.0, which adds `bazel/java/lite_proto_library.bzl`. Per bazelbuild#1647, we'd have to update to ScalaPB 1.0.0-alpha.1 to support `protobuf` v28, abandoning users of previous `protobuf` versions or forcing them to upgrade. ```txt $ bazel build //{src,test,third_party,scala_proto}/... [...snip...] ERROR: error loading package under directory 'src': error loading package 'src/java/io/bazel/rulesscala/worker': at .../external/rules_java/java/defs.bzl:16:6: Label '@com_google_protobuf//bazel:java_lite_proto_library.bzl' is invalid because 'bazel' is not a package; perhaps you meant to put the colon here: '@com_google_protobuf//:bazel/java_lite_proto_library.bzl'? ```
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