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Undefined @@rules_java_builtin repository with --noenable_workspace option #22754

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ghost opened this issue Jun 14, 2024 · 3 comments
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P1 I'll work on this now. (Assignee required) team-ExternalDeps External dependency handling, remote repositiories, WORKSPACE file. type: bug

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@ghost
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ghost commented Jun 14, 2024

Description of the bug:

It is sometimes necessary to have a WORSPACE file inside a test data directory. This is particularly the case for gazelle tests using the rule gazelle_generation_test.
But when we use a pure bzlmod Bazel project, with --enable_bzlmod and --noenable_workspace options, and without a file WORKSPACE.bzlmod, Bazel fails to visit this tests data directory containing a WORKSPACE file:

ERROR: Failed to load package, for testdata, skipping: error loading package '': Unable to find package for @@rules_java_builtin//toolchains:local_java_repository.bzl: The repository '@@rules_java_builtin' could not be resolved: Repository '@@rules_java_builtin' is not defined.
  • No problem with --enable_workspace option.
  • No problem with an empty WORKSPACE.bzlmod
  • No problem with an empty MODULE.bazel file inside the test data directory (gazelle_generation_test should support this solution).

Which category does this issue belong to?

External Dependency

What's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

.
├── .bazelrc
├── .bazelversion
├── BUILD.bazel
├── MODULE.bazel
└── testdata
    └── WORKSPACE

.bazelrc

common --enable_bzlmod
common --noenable_workspace
common --lockfile_mode=off

.bazelversion

7.2.0

BUILD.bazel

testfiles = glob(["testdata/**"])
print(testfiles)

MODULE.bazel

module(name = "foo")

$ bazel build :all
WARNING: Target pattern parsing failed.
ERROR: Skipping ':all': while parsing ':all': error loading package '': Unable to find package for @@rules_java_builtin//toolchains:local_java_repository.bzl: The repository '@@rules_java_builtin' could not be resolved: Repository '@@rules_java_builtin' is not defined.
ERROR: while parsing ':all': error loading package '': Unable to find package for @@rules_java_builtin//toolchains:local_java_repository.bzl: The repository '@@rules_java_builtin' could not be resolved: Repository '@@rules_java_builtin' is not defined.
INFO: Elapsed time: 0.023s
INFO: 0 processes.
ERROR: Build did NOT complete successfully

Which operating system are you running Bazel on?

Linux / amd64

What is the output of bazel info release?

release 7.2.0

If bazel info release returns development version or (@non-git), tell us how you built Bazel.

No response

What's the output of git remote get-url origin; git rev-parse HEAD ?

No response

If this is a regression, please try to identify the Bazel commit where the bug was introduced with bazelisk --bisect.

No response

Have you found anything relevant by searching the web?

No response

Any other information, logs, or outputs that you want to share?

No response

@github-actions github-actions bot added the team-ExternalDeps External dependency handling, remote repositiories, WORKSPACE file. label Jun 14, 2024
@Wyverald
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Thanks for the report! We missed a case of disabling WORKSPACE logic in LocalRepositoryLookupFunction. I'll send a change.

@Wyverald Wyverald added P1 I'll work on this now. (Assignee required) and removed untriaged labels Jun 17, 2024
@Wyverald Wyverald self-assigned this Jun 17, 2024
Wyverald added a commit that referenced this issue Jun 18, 2024
…le_workspace`

This still leaves the question of "what do we do instead?". See issues #22208 and #21515.

Fixes #22754.
bazel-io pushed a commit to bazel-io/bazel that referenced this issue Jun 20, 2024
…le_workspace`

This still leaves the question of "what do we do instead?". See issues bazelbuild#22208 and bazelbuild#21515.

Fixes bazelbuild#22754.

Closes bazelbuild#22774.

PiperOrigin-RevId: 645148811
Change-Id: Ib9d07d2ecbc3a79e3341de6739de1c3349124d6b
github-merge-queue bot pushed a commit that referenced this issue Jun 20, 2024
…--noenable_workspace` (#22837)

This still leaves the question of "what do we do instead?". See issues
#22208 and #21515.

Fixes #22754.

Closes #22774.

PiperOrigin-RevId: 645148811
Change-Id: Ib9d07d2ecbc3a79e3341de6739de1c3349124d6b

Commit
1246ff4

Co-authored-by: Xdng Yng <[email protected]>
@iancha1992
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A fix for this issue has been included in Bazel 7.2.1 RC2. Please test out the release candidate and report any issues as soon as possible.
If you're using Bazelisk, you can point to the latest RC by setting USE_BAZEL_VERSION=7.2.1rc2. Thanks!

iancha1992 pushed a commit to iancha1992/bazel that referenced this issue Jun 21, 2024
…le_workspace`

This still leaves the question of "what do we do instead?". See issues bazelbuild#22208 and bazelbuild#21515.

Fixes bazelbuild#22754.

Closes bazelbuild#22774.

PiperOrigin-RevId: 645148811
Change-Id: Ib9d07d2ecbc3a79e3341de6739de1c3349124d6b
@ghost
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ghost commented Jun 26, 2024

Tested with the new 7.2.1 release, and everything works as expected.
Thank you @iancha1992 @Wyverald

bazel-io pushed a commit to bazel-io/bazel that referenced this issue Jun 27, 2024
…le_workspace`

This still leaves the question of "what do we do instead?". See issues bazelbuild#22208 and bazelbuild#21515.

Fixes bazelbuild#22754.

Closes bazelbuild#22774.

PiperOrigin-RevId: 645148811
Change-Id: Ib9d07d2ecbc3a79e3341de6739de1c3349124d6b
github-merge-queue bot pushed a commit that referenced this issue Jun 28, 2024
…--noenable_workspace` (#22911)

This still leaves the question of "what do we do instead?". See issues
#22208 and #21515.

Fixes #22754.

Closes #22774.

PiperOrigin-RevId: 645148811
Change-Id: Ib9d07d2ecbc3a79e3341de6739de1c3349124d6b

Commit
1246ff4

Co-authored-by: Xdng Yng <[email protected]>
fmeum pushed a commit to fmeum/bazel that referenced this issue Jul 18, 2024
…--noenable_workspace` (bazelbuild#22837)

This still leaves the question of "what do we do instead?". See issues
bazelbuild#22208 and bazelbuild#21515.

Fixes bazelbuild#22754.

Closes bazelbuild#22774.

PiperOrigin-RevId: 645148811
Change-Id: Ib9d07d2ecbc3a79e3341de6739de1c3349124d6b

Commit
bazelbuild@1246ff4

Co-authored-by: Xdng Yng <[email protected]>
mbland added a commit to mbland/rules_scala that referenced this issue Oct 3, 2024
This begins the Bzlmod compatibility migration by updating Bazel to
version 7.3.2 and adding initial `MODULE.bazel` and `WORKSPACE.bzlmod`
files.

Part of: bazelbuild#1482

Though Bzlmod remains disabled, updating to Bazel 7.3.2 requred updating
or adding the following packages to maintain `WORKSPACE` compatibility.

In `rules_scala_setup()`:

- bazel_skylib: 1.4.1 => 1.7.1
- rules_cc: 0.0.6 => 0.0.10
- rules_java: 5.4.1 => 7.9.0
- rules_proto: 5.3.0-21.7 => 6.0.2

Dev dependencies in `WORKSPACE`:

- com_google_protobuf: 28.2
- rules_pkg: 1.0.1
- rules_jvm_external: 6.4
- com_google_absl: abseil-cpp-20240722.0
- zlib: 1.3.1

Of all of the new, explicit dev dependencies, only `com_google_protobuf`
will be necessary to include in `MODULE.bazel`. The Bzlmod mechanism
will discover these other transitive dev dependencies automatically.

Also removed the `rules_java_extra` repo from `WORKSPACE`, which
appeared unused.

---

Though the current `rules_java` version is 7.12.1, and largely works
with this repo, it requires a few temporary workarounds. Rather than
commit the workarounds, upgrading only to 7.9.0 now seems less crufty.

What follows is a very detailed explanation of what happens with 7.12.1
with Bazel 7.3.2, just to have it on the record.

---

The workaround is to change a few toolchain and macro file targets from
`@bazel_tools//tools/jdk:` to `@rules_java//toolchains:`. This isn't a
terribly bad or invasive workaround, but `@bazel_tools//tools/jdk:` is
clearly the canonical path. Best to keep it that way, lest we build up
technical debt.

Without the workaround, these targets would fail:

- //test/src/main/resources/java_sources:CompiledWithJava11
- //test/src/main/resources/java_sources:CompiledWithJava8
- //test/toolchains:java21_toolchain
- //test:JunitRuntimePlatform
- //test:JunitRuntimePlatform_test_runner
- //test:scala_binary_jdk_11

with this error:

```txt
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.
```

This appears to be a consequence of both upgrading the Bazel version
from 6.3.0 to 7.3.2 and updating `rules_java` to 7.12.1. The
`rules_java_builtin` repo is part of the `WORKSPACE` prefix that adds
implicit dependencies:

- https://bazel.build/external/migration#builtin-default-deps

This repo was added to 7.0.0-pre.20231011.2 in the following change,
mapped to `@rules_java` within the scope of the `@bazel_tools` repo:

- bazelbuild/bazel: Add rules_java_builtin to the users of Java modules
  bazelbuild/bazel@ff1abb2

This change tried to ensure `rules_java` remained compatible with
earlier Bazel versions. However, it changed all instances of
`@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` to
`//toolchains:bootstrap_runtime_toolchain_type`:

- bazelbuild/rules_java: Make rules_java backwards compatible with Bazel
  6.3.0
  bazelbuild/rules_java@30ecf3f

Bazel has bumped `rules_java` in its `workspace_deps.bzl` from 7.9.0 to
7.11.0, but it's only available as of 8.0.0-pre.20240911.1.

- bazelbuild/bazel: Update rules_java 7.11.1 / java_tools 13.8
  bazelbuild/bazel#23571
  bazelbuild/bazel@f92124a

---

What I believe is happening is, under Bazel 7.3.2 and `rules_java`
7.12.1:

- Bazel creates `rules_java` 7.9.0 as `@rules_java_builtin` in the
  `WORKSPACE` prefix.

- `@bazel_tools` has `@rules_java` mapped to `@rules_java_builtin` when
  initialized during the `WORKSPACE` prefix, during which
  `@bazel_tools//tools/jdk` registers `alias()` targets to
  `@rules_java` toolchain targets. These aliased toolchains specify
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` in their
  `toolchains` attribute.

- `WORKSPACE` loads `@rules_java` 7.12.1 and registers all its
  toolchains with type
  `@rules_java//toolchains:bootstrap_runtime_toolchain_type`.

- Some `@rules_java` rules explicitly specifying toolchains from
  `@bazel_tools//tools/jdk` can't find them, because the
  `@bazel_tools//tools/jdk` toolchain aliases expect toolchains of type
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type`.

This has broken other projects in the same way:

- bazelbuild/bazel: [Bazel CI] Downstream project broken by rules_java
  upgrade #23619
  bazelbuild/bazel#23619

These problems don't appear under Bzlmod, and `@rules_java_builtin` was
never required. This is because `WORKSPACE` executes its statements
sequentially, while Bzlmod builds the module dependency graph _before_
instantiating repositories (within module extensions).

It seems a fix is on the way that removes `@rules_java_builtin` from the
`WORKSPACE` prefix, and adds `@rules_java` to the suffix. At this
moment, though, it's not even in a prerelase:

- bazelbuild/bazel: Remove rules_java_builtin in WORKSPACE prefix
  bazelbuild/bazel@7506690

---

Note that the error message matches that from the following resolved
issue, but that issue was for non-Bzlmod child repos when `WORKSPACE`
was disabled.

- bazelbuild/bazel: Undefined @@rules_java_builtin repository with
  --noenable_workspace option
  bazelbuild/bazel#22754
mbland added a commit to mbland/rules_scala that referenced this issue Oct 5, 2024
Also removed the seemingly unused `rules_java_extra` stanza from
`WORKSPACE`.

`test_all.sh` and `test_lint.sh` continue to pass, after changing the
`@@repo_name` prefixes set when upgrading to Bazel 7.0.0 back to
`@repo_name`.

The `@rules_java` update fixes errors of the following type under Bazel
7.2.1:

```txt
ERROR: test/BUILD:640:10:
  While resolving toolchains for target //test:jar_lister (096dcc8):
  invalid registered toolchain
  '@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  no such target
  '@@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  target 'bootstrap_runtime_toolchain' not declared in package '' defined by
  .../external/remote_jdk8_linux_aarch64_toolchain_config_repo/BUILD.bazel

ERROR: Analysis of target '//test:jar_lister' failed; build aborted
```

---

Though `rules_java` version 7.12.1 is available, and largely works with
this repo when using Bazel 7.3.2, it requires a few temporary
workarounds. (As I write this, 8.0.0 came out just a few hours ago and I
haven't tried it.) Rather than commit the workarounds, upgrading only to
7.9.0 now seems less crufty.

Though this commit only updates Bazel to 7.2.1, I suspect it's probably
the same basic problem at play.

What follows is a very detailed explanation of what happens with 7.12.1
with Bazel 7.3.2, just to have it on the record.

---

The workaround is to change a few toolchain and macro file targets from
`@bazel_tools//tools/jdk:` to `@rules_java//toolchains:`. This isn't a
terribly bad or invasive workaround, but `@bazel_tools//tools/jdk:` is
clearly the canonical path. Best to keep it that way, lest we build up
technical debt.

Without the workaround, these targets would fail:

- //test/src/main/resources/java_sources:CompiledWithJava11
- //test/src/main/resources/java_sources:CompiledWithJava8
- //test/toolchains:java21_toolchain
- //test:JunitRuntimePlatform
- //test:JunitRuntimePlatform_test_runner
- //test:scala_binary_jdk_11

with this error:

```txt
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.
```

This appears to be a consequence of both upgrading the Bazel version to
7.3.2 and updating `rules_java` to 7.12.1. The `rules_java_builtin` repo
is part of the `WORKSPACE` prefix that adds implicit dependencies:

- https://bazel.build/external/migration#builtin-default-deps

This repo was added to 7.0.0-pre.20231011.2 in the following change,
mapped to `@rules_java` within the scope of the `@bazel_tools` repo:

- bazelbuild/bazel: Add rules_java_builtin to the users of Java modules
  bazelbuild/bazel@ff1abb2

This change tried to ensure `rules_java` remained compatible with
earlier Bazel versions. However, it changed all instances of
`@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` to
`//toolchains:bootstrap_runtime_toolchain_type`:

- bazelbuild/rules_java: Make rules_java backwards compatible with Bazel
  6.3.0
  bazelbuild/rules_java@30ecf3f

Bazel has bumped `rules_java` in its `workspace_deps.bzl` from 7.9.0 to
7.11.0, but it's only available as of 8.0.0-pre.20240911.1.

- bazelbuild/bazel: Update rules_java 7.11.1 / java_tools 13.8
  bazelbuild/bazel#23571
  bazelbuild/bazel@f92124a

---

What I believe is happening is, under Bazel 7.3.2 and `rules_java`
7.12.1:

- Bazel creates `rules_java` 7.9.0 as `@rules_java_builtin` in the
  `WORKSPACE` prefix.

- `@bazel_tools` has `@rules_java` mapped to `@rules_java_builtin` when
  initialized during the `WORKSPACE` prefix, during which
  `@bazel_tools//tools/jdk` registers `alias()` targets to
  `@rules_java` toolchain targets. These aliased toolchains specify
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` in their
  `toolchains` attribute.

- `WORKSPACE` loads `@rules_java` 7.12.1 and registers all its
  toolchains with type
  `@rules_java//toolchains:bootstrap_runtime_toolchain_type`.

- Some `@rules_java` rules explicitly specifying toolchains from
  `@bazel_tools//tools/jdk` can't find them, because the
  `@bazel_tools//tools/jdk` toolchain aliases expect toolchains of type
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type`.

This has broken other projects in the same way:

- bazelbuild/bazel: [Bazel CI] Downstream project broken by rules_java
  upgrade #23619
  bazelbuild/bazel#23619

These problems don't appear under Bzlmod, whereby `@rules_java_builtin`
was never required. This is because `WORKSPACE` executes its statements
sequentially, while Bzlmod builds the module dependency graph _before_
instantiating repositories (within module extensions).

It seems a fix is on the way that removes `@rules_java_builtin` from the
`WORKSPACE` prefix, and adds `@rules_java` to the suffix. At this
moment, though, it's not even in a prerelease:

- bazelbuild/bazel: Remove rules_java_builtin in WORKSPACE prefix
  bazelbuild/bazel@7506690

---

Note that the error message matches that from the following resolved
issue, but that issue was for non-Bzlmod child repos when `WORKSPACE`
was disabled.

- bazelbuild/bazel: Undefined @@rules_java_builtin repository with
  --noenable_workspace option
  bazelbuild/bazel#22754
mbland added a commit to mbland/rules_scala that referenced this issue Oct 5, 2024
Also removed the seemingly unused `rules_java_extra` stanza from
`WORKSPACE`.

`test_all.sh` and `test_lint.sh` continue to pass, after changing the
`@@repo_name` prefixes set when upgrading to Bazel 7.0.0 back to
`@repo_name`.

The `@rules_java` update fixes errors of the following type under Bazel
7.2.1:

```txt
ERROR: test/BUILD:640:10:
  While resolving toolchains for target //test:jar_lister (096dcc8):
  invalid registered toolchain
  '@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  no such target
  '@@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  target 'bootstrap_runtime_toolchain' not declared in package '' defined by
  .../external/remote_jdk8_linux_aarch64_toolchain_config_repo/BUILD.bazel

ERROR: Analysis of target '//test:jar_lister' failed; build aborted
```

---

Though `rules_java` version 7.12.1 is available, and largely works with
this repo when using Bazel 7.3.2, it requires a few temporary
workarounds. (As I write this, 8.0.0 came out just a few hours ago and I
haven't tried it.) Rather than commit the workarounds, upgrading only to
7.9.0 now seems less crufty.

Though this commit only updates Bazel to 7.2.1, I suspect it's probably
the same basic problem at play.

What follows is a very detailed explanation of what happens with 7.12.1
with Bazel 7.3.2, just to have it on the record.

---

The workaround is to change a few toolchain and macro file targets from
`@bazel_tools//tools/jdk:` to `@rules_java//toolchains:`. This isn't a
terribly bad or invasive workaround, but `@bazel_tools//tools/jdk:` is
clearly the canonical path. Best to keep it that way, lest we build up
technical debt.

Without the workaround, these targets would fail:

- //test/src/main/resources/java_sources:CompiledWithJava11
- //test/src/main/resources/java_sources:CompiledWithJava8
- //test/toolchains:java21_toolchain
- //test:JunitRuntimePlatform
- //test:JunitRuntimePlatform_test_runner
- //test:scala_binary_jdk_11

with this error:

```txt
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.
```

This appears to be a consequence of both upgrading the Bazel version to
7.3.2 and updating `rules_java` to 7.12.1. The `rules_java_builtin` repo
is part of the `WORKSPACE` prefix that adds implicit dependencies:

- https://bazel.build/external/migration#builtin-default-deps

This repo was added to 7.0.0-pre.20231011.2 in the following change,
mapped to `@rules_java` within the scope of the `@bazel_tools` repo:

- bazelbuild/bazel: Add rules_java_builtin to the users of Java modules
  bazelbuild/bazel@ff1abb2

This change tried to ensure `rules_java` remained compatible with
earlier Bazel versions. However, it changed all instances of
`@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` to
`//toolchains:bootstrap_runtime_toolchain_type`:

- bazelbuild/rules_java: Make rules_java backwards compatible with Bazel
  6.3.0
  bazelbuild/rules_java@30ecf3f

Bazel has bumped `rules_java` in its `workspace_deps.bzl` from 7.9.0 to
7.11.0, but it's only available as of 8.0.0-pre.20240911.1.

- bazelbuild/bazel: Update rules_java 7.11.1 / java_tools 13.8
  bazelbuild/bazel#23571
  bazelbuild/bazel@f92124a

---

What I believe is happening is, under Bazel 7.3.2 and `rules_java`
7.12.1:

- Bazel creates `rules_java` 7.9.0 as `@rules_java_builtin` in the
  `WORKSPACE` prefix.

- `@bazel_tools` has `@rules_java` mapped to `@rules_java_builtin` when
  initialized during the `WORKSPACE` prefix, during which
  `@bazel_tools//tools/jdk` registers `alias()` targets to
  `@rules_java` toolchain targets. These aliased toolchains specify
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` in their
  `toolchains` attribute.

- `WORKSPACE` loads `@rules_java` 7.12.1 and registers all its
  toolchains with type
  `@rules_java//toolchains:bootstrap_runtime_toolchain_type`.

- Some `@rules_java` rules explicitly specifying toolchains from
  `@bazel_tools//tools/jdk` can't find them, because the
  `@bazel_tools//tools/jdk` toolchain aliases expect toolchains of type
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type`.

This has broken other projects in the same way:

- bazelbuild/bazel: [Bazel CI] Downstream project broken by rules_java
  upgrade #23619
  bazelbuild/bazel#23619

These problems don't appear under Bzlmod, whereby `@rules_java_builtin`
was never required. This is because `WORKSPACE` executes its statements
sequentially, while Bzlmod builds the module dependency graph _before_
instantiating repositories (within module extensions).

It seems a fix is on the way that removes `@rules_java_builtin` from the
`WORKSPACE` prefix, and adds `@rules_java` to the suffix. At this
moment, though, it's not even in a prerelease:

- bazelbuild/bazel: Remove rules_java_builtin in WORKSPACE prefix
  bazelbuild/bazel@7506690

---

Note that the error message matches that from the following resolved
issue, but that issue was for non-Bzlmod child repos when `WORKSPACE`
was disabled.

- bazelbuild/bazel: Undefined @@rules_java_builtin repository with
  --noenable_workspace option
  bazelbuild/bazel#22754
mbland added a commit to mbland/rules_scala that referenced this issue Oct 6, 2024
Also removed the seemingly unused `rules_java_extra` stanza from
`WORKSPACE`.

`test_all.sh` continues to pass after changing the `@@repo_name`
prefixes set when upgrading to Bazel 7.0.0 back to `@repo_name`.
`test_{lint,examples,coverage}.sh` also continue to pass.

The `@rules_java` update fixes errors of the following type under Bazel
7.2.1:

```txt
ERROR: test/BUILD:640:10:
  While resolving toolchains for target //test:jar_lister (096dcc8):
  invalid registered toolchain
  '@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  no such target
  '@@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  target 'bootstrap_runtime_toolchain' not declared in package '' defined by
  .../external/remote_jdk8_linux_aarch64_toolchain_config_repo/BUILD.bazel

ERROR: Analysis of target '//test:jar_lister' failed; build aborted
```

---

Though `rules_java` version 7.12.1 is available, and largely works with
this repo when using Bazel 7.3.2, it requires a few temporary
workarounds. (As I write this, 8.0.0 came out just a few hours ago and I
haven't tried it.) Rather than commit the workarounds, upgrading only to
7.9.0 now seems less crufty.

Though this commit only updates Bazel to 7.2.1, I suspect it's probably
the same basic problem at play.

What follows is a very detailed explanation of what happens with 7.12.1
with Bazel 7.3.2, just to have it on the record.

---

The workaround is to change a few toolchain and macro file targets from
`@bazel_tools//tools/jdk:` to `@rules_java//toolchains:`. This isn't a
terribly bad or invasive workaround, but `@bazel_tools//tools/jdk:` is
clearly the canonical path. Best to keep it that way, lest we build up
technical debt.

Without the workaround, these targets would fail:

- //test/src/main/resources/java_sources:CompiledWithJava11
- //test/src/main/resources/java_sources:CompiledWithJava8
- //test/toolchains:java21_toolchain
- //test:JunitRuntimePlatform
- //test:JunitRuntimePlatform_test_runner
- //test:scala_binary_jdk_11

with this error:

```txt
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.
```

This appears to be a consequence of both upgrading the Bazel version to
7.3.2 and updating `rules_java` to 7.12.1. The `rules_java_builtin` repo
is part of the `WORKSPACE` prefix that adds implicit dependencies:

- https://bazel.build/external/migration#builtin-default-deps

This repo was added to 7.0.0-pre.20231011.2 in the following change,
mapped to `@rules_java` within the scope of the `@bazel_tools` repo:

- bazelbuild/bazel: Add rules_java_builtin to the users of Java modules
  bazelbuild/bazel@ff1abb2

This change tried to ensure `rules_java` remained compatible with
earlier Bazel versions. However, it changed all instances of
`@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` to
`//toolchains:bootstrap_runtime_toolchain_type`:

- bazelbuild/rules_java: Make rules_java backwards compatible with Bazel
  6.3.0
  bazelbuild/rules_java@30ecf3f

Bazel has bumped `rules_java` in its `workspace_deps.bzl` from 7.9.0 to
7.11.0, but it's only available as of 8.0.0-pre.20240911.1.

- bazelbuild/bazel: Update rules_java 7.11.1 / java_tools 13.8
  bazelbuild/bazel#23571
  bazelbuild/bazel@f92124a

---

What I believe is happening is, under Bazel 7.3.2 and `rules_java`
7.12.1:

- Bazel creates `rules_java` 7.9.0 as `@rules_java_builtin` in the
  `WORKSPACE` prefix.

- `@bazel_tools` has `@rules_java` mapped to `@rules_java_builtin` when
  initialized during the `WORKSPACE` prefix, during which
  `@bazel_tools//tools/jdk` registers `alias()` targets to
  `@rules_java` toolchain targets. These aliased toolchains specify
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` in their
  `toolchains` attribute.

- `WORKSPACE` loads `@rules_java` 7.12.1 and registers all its
  toolchains with type
  `@rules_java//toolchains:bootstrap_runtime_toolchain_type`.

- Some `@rules_java` rules explicitly specifying toolchains from
  `@bazel_tools//tools/jdk` can't find them, because the
  `@bazel_tools//tools/jdk` toolchain aliases expect toolchains of type
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type`.

This has broken other projects in the same way:

- bazelbuild/bazel: [Bazel CI] Downstream project broken by rules_java
  upgrade #23619
  bazelbuild/bazel#23619

These problems don't appear under Bzlmod, whereby `@rules_java_builtin`
was never required. This is because `WORKSPACE` executes its statements
sequentially, while Bzlmod builds the module dependency graph _before_
instantiating repositories (within module extensions).

It seems a fix is on the way that removes `@rules_java_builtin` from the
`WORKSPACE` prefix, and adds `@rules_java` to the suffix. At this
moment, though, it's not even in a prerelease:

- bazelbuild/bazel: Remove rules_java_builtin in WORKSPACE prefix
  bazelbuild/bazel@7506690

---

Note that the error message matches that from the following resolved
issue, but that issue was for non-Bzlmod child repos when `WORKSPACE`
was disabled.

- bazelbuild/bazel: Undefined @@rules_java_builtin repository with
  --noenable_workspace option
  bazelbuild/bazel#22754
mbland added a commit to mbland/rules_scala that referenced this issue Oct 6, 2024
Updated rules_java to 7.9.0 to fix errors of the following type under
Bazel 7.2.1:

```txt
ERROR: test/BUILD:640:10:
  While resolving toolchains for target //test:jar_lister (096dcc8):
  invalid registered toolchain
  '@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  no such target
  '@@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  target 'bootstrap_runtime_toolchain' not declared in package '' defined by
  .../external/remote_jdk8_linux_aarch64_toolchain_config_repo/BUILD.bazel

ERROR: Analysis of target '//test:jar_lister' failed; build aborted
```

Also removed the seemingly unused `rules_java_extra` stanza from
`WORKSPACE`.

---

Though `rules_java` version 7.12.1 is available, and largely works with
this repo when using Bazel 7.3.2, it requires a few temporary
workarounds. (As I write this, 8.0.0 came out just a few hours ago and I
haven't tried it.) Rather than commit the workarounds, upgrading only to
7.9.0 now seems less crufty.

Though this commit only updates Bazel to 7.2.1, I suspect it's probably
the same basic problem at play.

What follows is a very detailed explanation of what happens with 7.12.1
with Bazel 7.3.2, just to have it on the record.

---

The workaround is to change a few toolchain and macro file targets from
`@bazel_tools//tools/jdk:` to `@rules_java//toolchains:`. This isn't a
terribly bad or invasive workaround, but `@bazel_tools//tools/jdk:` is
clearly the canonical path. Best to keep it that way, lest we build up
technical debt.

Without the workaround, these targets would fail:

- //test/src/main/resources/java_sources:CompiledWithJava11
- //test/src/main/resources/java_sources:CompiledWithJava8
- //test/toolchains:java21_toolchain
- //test:JunitRuntimePlatform
- //test:JunitRuntimePlatform_test_runner
- //test:scala_binary_jdk_11

with this error:

```txt
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.
```

This appears to be a consequence of both upgrading the Bazel version to
7.3.2 and updating `rules_java` to 7.12.1. The `rules_java_builtin` repo
is part of the `WORKSPACE` prefix that adds implicit dependencies:

- https://bazel.build/external/migration#builtin-default-deps

This repo was added to 7.0.0-pre.20231011.2 in the following change,
mapped to `@rules_java` within the scope of the `@bazel_tools` repo:

- bazelbuild/bazel: Add rules_java_builtin to the users of Java modules
  bazelbuild/bazel@ff1abb2

This change tried to ensure `rules_java` remained compatible with
earlier Bazel versions. However, it changed all instances of
`@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` to
`//toolchains:bootstrap_runtime_toolchain_type`:

- bazelbuild/rules_java: Make rules_java backwards compatible with Bazel
  6.3.0
  bazelbuild/rules_java@30ecf3f

Bazel has bumped `rules_java` in its `workspace_deps.bzl` from 7.9.0 to
7.11.0, but it's only available as of 8.0.0-pre.20240911.1.

- bazelbuild/bazel: Update rules_java 7.11.1 / java_tools 13.8
  bazelbuild/bazel#23571
  bazelbuild/bazel@f92124a

---

What I believe is happening is, under Bazel 7.3.2 and `rules_java`
7.12.1:

- Bazel creates `rules_java` 7.9.0 as `@rules_java_builtin` in the
  `WORKSPACE` prefix.

- `@bazel_tools` has `@rules_java` mapped to `@rules_java_builtin` when
  initialized during the `WORKSPACE` prefix, during which
  `@bazel_tools//tools/jdk` registers `alias()` targets to
  `@rules_java` toolchain targets. These aliased toolchains specify
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` in their
  `toolchains` attribute.

- `WORKSPACE` loads `@rules_java` 7.12.1 and registers all its
  toolchains with type
  `@rules_java//toolchains:bootstrap_runtime_toolchain_type`.

- Some `@rules_java` rules explicitly specifying toolchains from
  `@bazel_tools//tools/jdk` can't find them, because the
  `@bazel_tools//tools/jdk` toolchain aliases expect toolchains of type
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type`.

This has broken other projects in the same way:

- bazelbuild/bazel: [Bazel CI] Downstream project broken by rules_java
  upgrade #23619
  bazelbuild/bazel#23619

These problems don't appear under Bzlmod, whereby `@rules_java_builtin`
was never required. This is because `WORKSPACE` executes its statements
sequentially, while Bzlmod builds the module dependency graph _before_
instantiating repositories (within module extensions).

It seems a fix is on the way that removes `@rules_java_builtin` from the
`WORKSPACE` prefix, and adds `@rules_java` to the suffix. At this
moment, though, it's not even in a prerelease:

- bazelbuild/bazel: Remove rules_java_builtin in WORKSPACE prefix
  bazelbuild/bazel@7506690

---

Note that the error message matches that from the following resolved
issue, but that issue was for non-Bzlmod child repos when `WORKSPACE`
was disabled.

- bazelbuild/bazel: Undefined @@rules_java_builtin repository with
  --noenable_workspace option
  bazelbuild/bazel#22754
liucijus pushed a commit to bazelbuild/rules_scala that referenced this issue Oct 8, 2024
* Add toolchain_type to thrift_lib, scrooge aspects

This fixes the following error:

```txt
Error in create_header_compilation_action: Rule 'thrift_library' in
  'rules_scala/test/src/main/scala/scalarules/test/twitter_scrooge/thrift/
  thrift_with_compiler_args/BUILD:3:15'
must declare '@@bazel_tools//tools/jdk:toolchain_type' toolchain in
order to use java_common.

See bazelbuild/bazel#18970.
```

Interestingly, adding the toolchain type to `thrift_library` isn't
enough; I had to add it to the twitter_scrooge aspects as well. Until I
did, it produced the same error message pointing at `thrift_library`,
after first reporting:

```txt
ERROR: rules_scala/test/src/main/scala/scalarules/test/twitter_scrooge/
  thrift/thrift_with_compiler_args/BUILD:3:15:

in //twitter_scrooge:twitter_scrooge.bzl%scrooge_java_aspect aspect
  on thrift_library rule
  //test/src/main/scala/scalarules/test/twitter_scrooge/thrift/
    thrift_with_compiler_args:thrift5:

Traceback (most recent call last):
  File "rules_scala/twitter_scrooge/twitter_scrooge.bzl",
    line 420, column 49, in _scrooge_java_aspect_impl
  return _common_scrooge_aspect_implementation(target, ctx, "java",
    _compile_generated_java)
  [ ...snip... ]
```

* Fix proto_cross_repo_boundary build_file attribute

Bazel 7 enforces that this be a proper target label, not a relative
path.

```txt
ERROR: WORKSPACE:91:37: fetching new_local_repository rule
  //external:proto_cross_repo_boundary:
  .../external/test/proto_cross_repo_boundary/repo/BUILD.repo
  is not a regular file; if you're using a relative or absolute path for
  `build_file` in your `new_local_repository` rule, please switch to
  using a label instead

INFO: Repository remote_jdk8_macos instantiated at:
  WORKSPACE:175:18: in <toplevel>
  .../external/rules_java/java/repositories.bzl:120:10:
    in remote_jdk8_repos
  .../external/bazel_tools/tools/build_defs/repo/utils.bzl:240:18:
    in maybe
  .../external/rules_java/toolchains/remote_java_repository.bzl:48:17:
    in remote_java_repository

Repository rule http_archive defined at:
  .../external/bazel_tools/tools/build_defs/repo/http.bzl:384:31:
  in <toplevel>

ERROR: no such package '@@proto_cross_repo_boundary//':
  .../external/test/proto_cross_repo_boundary/repo/BUILD.repo
  is not a regular file; if you're using a relative or absolute path for
  `build_file` in your `new_local_repository` rule, please switch to
  using a label instead

ERROR: test/proto_cross_repo_boundary/BUILD:3:22:
  //test/proto_cross_repo_boundary:sample_scala_proto depends on
  @@proto_cross_repo_boundary//:sample_proto in repository
  @@proto_cross_repo_boundary which failed to fetch. no such package
  '@@proto_cross_repo_boundary//':
  .../external/test/proto_cross_repo_boundary/repo/BUILD.repo
  is not a regular file; if you're using a relative or absolute path for
  `build_file` in your `new_local_repository` rule, please switch to
  using a label instead

Use --verbose_failures to see the command lines of failed build steps.
ERROR: Analysis of target
  '//test/proto_cross_repo_boundary:sample_scala_proto' failed;
  build aborted: Analysis failed
```

* Add rules_python stanza to WORKSPACE files

Fixes the following breakages under Bazel 7:

```txt
$ bazel build //src/...

ERROR: error loading package '@@bazel_tools//src/main/protobuf':
  cannot load '@@rules_python//python:proto.bzl': no such file

ERROR:
  .../src/java/io/bazel/rulesscala/coverage/instrumenter/BUILD:3:12:
  error loading package '@@bazel_tools//src/main/protobuf':
  cannot load '@@rules_python//python:proto.bzl':
  no such file and referenced by
  '//src/java/io/bazel/rulesscala/coverage/instrumenter:instrumenter'
```

* Set --noenable_bzlmod to prevent MODULE.bazel

Makes sure Bazel doesn't autogenerate MODULE.bazel and MODULE.bazel.lock
files for now.

* Update to Bazel 6.5.0

This is the last release in the Bazel 6 line. With the changes up to
this point, the Bazel 7 build only fails on protobuf generation, e.g.
on `bazel build //test/proto3:all`, as seen below. Bumping to Bazel
6.5.0 on top of all the previous changes isolates the Bazel 7.0.0
changes causing the failure.

```txt
$ bazel build //test/proto3:all

ERROR: .../rules_scala/test/proto3/BUILD:14:14:
  ProtoScalaPBRule test/proto3/generated-proto-lib_jvm_extra_protobuf_generator_scalapb.srcjar
  failed: (Exit 1): scalapb_worker failed:
  error executing ProtoScalaPBRule command
  (from target //test/proto3:generated-proto-lib)
  bazel-out/darwin_arm64-opt-exec-ST-13d3ddad9198/bin/src/scala/scripts/scalapb_worker
    ... (remaining 2 arguments skipped)

Could not find file in descriptor database:
  bazel-out/darwin_arm64-fastbuild/bin/test/proto3/generated.proto:
  No such file or directory

java.lang.RuntimeException: Exit with code 1
        at scala.sys.package$.error(package.scala:30)
        at scripts.ScalaPBWorker$.work(ScalaPBWorker.scala:44)
        at io.bazel.rulesscala.worker.Worker.persistentWorkerMain(Worker.java:96)
        at io.bazel.rulesscala.worker.Worker.workerMain(Worker.java:49)
        at scripts.ScalaPBWorker$.main(ScalaPBWorker.scala:39)
        at scripts.ScalaPBWorker.main(ScalaPBWorker.scala)
Use --verbose_failures to see the command lines of failed build steps.

ERROR: .../rules_scala/test/proto3/BUILD:14:14
  scala @//test/proto3:generated-proto-lib
  failed: (Exit 1): scalapb_worker failed:
  error executing ProtoScalaPBRule command
  (from target //test/proto3:generated-proto-lib)
  bazel-out/darwin_arm64-opt-exec-ST-13d3ddad9198/bin/src/scala/scripts/scalapb_worker
    ... (remaining 2 arguments skipped)
```

* Fix WORKSPACE lint errors

One of these days I'll remember to run `bazel run //tools:lint_fix`
before opening a pull request.

* Set --enable_workspace on last_green CI build

Learning more about BuildKite every day.

* Allow test_all.sh to pass under Bazel 7

`bash ./test_all.sh` passes after minor updates to the following test
cases to handle slightly different behavior under Bazel 7:

- `test_custom_reporter_class_has_been_set` makes the test output dir
  writable, since it no longer is by default.

- `test_scala_import_expect_failure_on_missing_direct_deps_warn_mode`
  removes preexisting output, since Bazel 7 won't emit warnings if it
  already exists.

---

FYI: Under Bazel 7.0 and Bazel 7.1, buildifier warnings for external
targets in the following test cases changed to begin with `@@repo_name`
instead of `@repo_name`:

- test/shell/test_scala_library.sh:
  `test_scala_library_expect_failure_on_missing_direct_external_deps_jar`
  `test_scala_library_expect_failure_on_missing_direct_external_deps_file_group`

- test/shell/test_strict_dependency.sh:
  `test_stamped_target_label_loading`
  `test_strict_deps_filter_included_target`

- test/shell/test_test_unused_dependency.sh:
  `test_unused_deps_filter_included_target`

However, as of Bazel 7.2, those warnings changed back to `@repo_name`,
so those changes aren't reflected in this commit.

* Bump to rules_go 0.39.1 for Bazel 7 compatibility

`bazel run //tools:lint_{check,fix}` required updating rules_go to
0.39.1 to work under Bazel 7.

The previous rules_go version 0.38.1 caused the following error:

```txt
$ ./test_lint.sh
ERROR: .../external/io_bazel_rules_go/BUILD.bazel:71:16:
  in (an implicit dependency) attribute of go_context_data rule
  @@io_bazel_rules_go//:go_context_data:
  in $whitelist_function_transition attribute of go_context_data rule
  @@io_bazel_rules_go//:go_context_data: package group
  '@@bazel_tools//tools/whitelists/function_transition_whitelist:function_transition_whitelist'
  is misplaced here (they are only allowed in the visibility attribute)

ERROR: .../external/io_bazel_rules_go/BUILD.bazel:71:16:
  Analysis of target '@@io_bazel_rules_go//:go_context_data' failed

ERROR: Analysis of target '//tools:lint_check' failed;
  build aborted: Analysis failed
```

* Bump to rules_java 7.9.0 for Bazel 7 compatibility

Updated rules_java to 7.9.0 to fix errors of the following type under
Bazel 7.2.1:

```txt
ERROR: test/BUILD:640:10:
  While resolving toolchains for target //test:jar_lister (096dcc8):
  invalid registered toolchain
  '@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  no such target
  '@@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  target 'bootstrap_runtime_toolchain' not declared in package '' defined by
  .../external/remote_jdk8_linux_aarch64_toolchain_config_repo/BUILD.bazel

ERROR: Analysis of target '//test:jar_lister' failed; build aborted
```

Also removed the seemingly unused `rules_java_extra` stanza from
`WORKSPACE`.

---

Though `rules_java` version 7.12.1 is available, and largely works with
this repo when using Bazel 7.3.2, it requires a few temporary
workarounds. (As I write this, 8.0.0 came out just a few hours ago and I
haven't tried it.) Rather than commit the workarounds, upgrading only to
7.9.0 now seems less crufty.

Though this commit only updates Bazel to 7.2.1, I suspect it's probably
the same basic problem at play.

What follows is a very detailed explanation of what happens with 7.12.1
with Bazel 7.3.2, just to have it on the record.

---

The workaround is to change a few toolchain and macro file targets from
`@bazel_tools//tools/jdk:` to `@rules_java//toolchains:`. This isn't a
terribly bad or invasive workaround, but `@bazel_tools//tools/jdk:` is
clearly the canonical path. Best to keep it that way, lest we build up
technical debt.

Without the workaround, these targets would fail:

- //test/src/main/resources/java_sources:CompiledWithJava11
- //test/src/main/resources/java_sources:CompiledWithJava8
- //test/toolchains:java21_toolchain
- //test:JunitRuntimePlatform
- //test:JunitRuntimePlatform_test_runner
- //test:scala_binary_jdk_11

with this error:

```txt
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.
```

This appears to be a consequence of both upgrading the Bazel version to
7.3.2 and updating `rules_java` to 7.12.1. The `rules_java_builtin` repo
is part of the `WORKSPACE` prefix that adds implicit dependencies:

- https://bazel.build/external/migration#builtin-default-deps

This repo was added to 7.0.0-pre.20231011.2 in the following change,
mapped to `@rules_java` within the scope of the `@bazel_tools` repo:

- bazelbuild/bazel: Add rules_java_builtin to the users of Java modules
  bazelbuild/bazel@ff1abb2

This change tried to ensure `rules_java` remained compatible with
earlier Bazel versions. However, it changed all instances of
`@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` to
`//toolchains:bootstrap_runtime_toolchain_type`:

- bazelbuild/rules_java: Make rules_java backwards compatible with Bazel
  6.3.0
  bazelbuild/rules_java@30ecf3f

Bazel has bumped `rules_java` in its `workspace_deps.bzl` from 7.9.0 to
7.11.0, but it's only available as of 8.0.0-pre.20240911.1.

- bazelbuild/bazel: Update rules_java 7.11.1 / java_tools 13.8
  bazelbuild/bazel#23571
  bazelbuild/bazel@f92124a

---

What I believe is happening is, under Bazel 7.3.2 and `rules_java`
7.12.1:

- Bazel creates `rules_java` 7.9.0 as `@rules_java_builtin` in the
  `WORKSPACE` prefix.

- `@bazel_tools` has `@rules_java` mapped to `@rules_java_builtin` when
  initialized during the `WORKSPACE` prefix, during which
  `@bazel_tools//tools/jdk` registers `alias()` targets to
  `@rules_java` toolchain targets. These aliased toolchains specify
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` in their
  `toolchains` attribute.

- `WORKSPACE` loads `@rules_java` 7.12.1 and registers all its
  toolchains with type
  `@rules_java//toolchains:bootstrap_runtime_toolchain_type`.

- Some `@rules_java` rules explicitly specifying toolchains from
  `@bazel_tools//tools/jdk` can't find them, because the
  `@bazel_tools//tools/jdk` toolchain aliases expect toolchains of type
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type`.

This has broken other projects in the same way:

- bazelbuild/bazel: [Bazel CI] Downstream project broken by rules_java
  upgrade #23619
  bazelbuild/bazel#23619

These problems don't appear under Bzlmod, whereby `@rules_java_builtin`
was never required. This is because `WORKSPACE` executes its statements
sequentially, while Bzlmod builds the module dependency graph _before_
instantiating repositories (within module extensions).

It seems a fix is on the way that removes `@rules_java_builtin` from the
`WORKSPACE` prefix, and adds `@rules_java` to the suffix. At this
moment, though, it's not even in a prerelease:

- bazelbuild/bazel: Remove rules_java_builtin in WORKSPACE prefix
  bazelbuild/bazel@7506690

---

Note that the error message matches that from the following resolved
issue, but that issue was for non-Bzlmod child repos when `WORKSPACE`
was disabled.

- bazelbuild/bazel: Undefined @@rules_java_builtin repository with
  --noenable_workspace option
  bazelbuild/bazel#22754
mbland added a commit to mbland/rules_scala that referenced this issue Oct 8, 2024
Also removed the seemingly unused `rules_java_extra` stanza from
`WORKSPACE`.

`test_all.sh` continues to pass after changing the `@@repo_name`
prefixes set when upgrading to Bazel 7.0.0 back to `@repo_name`.
`test_{lint,examples,coverage}.sh` also continue to pass.

The `@rules_java` update fixes errors of the following type under Bazel
7.2.1:

```txt
ERROR: test/BUILD:640:10:
  While resolving toolchains for target //test:jar_lister (096dcc8):
  invalid registered toolchain
  '@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  no such target
  '@@remote_jdk8_linux_aarch64_toolchain_config_repo//:bootstrap_runtime_toolchain':
  target 'bootstrap_runtime_toolchain' not declared in package '' defined by
  .../external/remote_jdk8_linux_aarch64_toolchain_config_repo/BUILD.bazel

ERROR: Analysis of target '//test:jar_lister' failed; build aborted
```

---

Though `rules_java` version 7.12.1 is available, and largely works with
this repo when using Bazel 7.3.2, it requires a few temporary
workarounds. (As I write this, 8.0.0 came out just a few hours ago and I
haven't tried it.) Rather than commit the workarounds, upgrading only to
7.9.0 now seems less crufty.

Though this commit only updates Bazel to 7.2.1, I suspect it's probably
the same basic problem at play.

What follows is a very detailed explanation of what happens with 7.12.1
with Bazel 7.3.2, just to have it on the record.

---

The workaround is to change a few toolchain and macro file targets from
`@bazel_tools//tools/jdk:` to `@rules_java//toolchains:`. This isn't a
terribly bad or invasive workaround, but `@bazel_tools//tools/jdk:` is
clearly the canonical path. Best to keep it that way, lest we build up
technical debt.

Without the workaround, these targets would fail:

- //test/src/main/resources/java_sources:CompiledWithJava11
- //test/src/main/resources/java_sources:CompiledWithJava8
- //test/toolchains:java21_toolchain
- //test:JunitRuntimePlatform
- //test:JunitRuntimePlatform_test_runner
- //test:scala_binary_jdk_11

with this error:

```txt
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.
```

This appears to be a consequence of both upgrading the Bazel version to
7.3.2 and updating `rules_java` to 7.12.1. The `rules_java_builtin` repo
is part of the `WORKSPACE` prefix that adds implicit dependencies:

- https://bazel.build/external/migration#builtin-default-deps

This repo was added to 7.0.0-pre.20231011.2 in the following change,
mapped to `@rules_java` within the scope of the `@bazel_tools` repo:

- bazelbuild/bazel: Add rules_java_builtin to the users of Java modules
  bazelbuild/bazel@ff1abb2

This change tried to ensure `rules_java` remained compatible with
earlier Bazel versions. However, it changed all instances of
`@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` to
`//toolchains:bootstrap_runtime_toolchain_type`:

- bazelbuild/rules_java: Make rules_java backwards compatible with Bazel
  6.3.0
  bazelbuild/rules_java@30ecf3f

Bazel has bumped `rules_java` in its `workspace_deps.bzl` from 7.9.0 to
7.11.0, but it's only available as of 8.0.0-pre.20240911.1.

- bazelbuild/bazel: Update rules_java 7.11.1 / java_tools 13.8
  bazelbuild/bazel#23571
  bazelbuild/bazel@f92124a

---

What I believe is happening is, under Bazel 7.3.2 and `rules_java`
7.12.1:

- Bazel creates `rules_java` 7.9.0 as `@rules_java_builtin` in the
  `WORKSPACE` prefix.

- `@bazel_tools` has `@rules_java` mapped to `@rules_java_builtin` when
  initialized during the `WORKSPACE` prefix, during which
  `@bazel_tools//tools/jdk` registers `alias()` targets to
  `@rules_java` toolchain targets. These aliased toolchains specify
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type` in their
  `toolchains` attribute.

- `WORKSPACE` loads `@rules_java` 7.12.1 and registers all its
  toolchains with type
  `@rules_java//toolchains:bootstrap_runtime_toolchain_type`.

- Some `@rules_java` rules explicitly specifying toolchains from
  `@bazel_tools//tools/jdk` can't find them, because the
  `@bazel_tools//tools/jdk` toolchain aliases expect toolchains of type
  `@bazel_tools//tools/jdk:bootstrap_runtime_toolchain_type`.

This has broken other projects in the same way:

- bazelbuild/bazel: [Bazel CI] Downstream project broken by rules_java
  upgrade #23619
  bazelbuild/bazel#23619

These problems don't appear under Bzlmod, whereby `@rules_java_builtin`
was never required. This is because `WORKSPACE` executes its statements
sequentially, while Bzlmod builds the module dependency graph _before_
instantiating repositories (within module extensions).

It seems a fix is on the way that removes `@rules_java_builtin` from the
`WORKSPACE` prefix, and adds `@rules_java` to the suffix. At this
moment, though, it's not even in a prerelease:

- bazelbuild/bazel: Remove rules_java_builtin in WORKSPACE prefix
  bazelbuild/bazel@7506690

---

Note that the error message matches that from the following resolved
issue, but that issue was for non-Bzlmod child repos when `WORKSPACE`
was disabled.

- bazelbuild/bazel: Undefined @@rules_java_builtin repository with
  --noenable_workspace option
  bazelbuild/bazel#22754
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P1 I'll work on this now. (Assignee required) team-ExternalDeps External dependency handling, remote repositiories, WORKSPACE file. type: bug
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