Rename maven to protobuf_maven in MODULE.bazel (#18641)

The default name for the rules_jvm_external.maven rule is "maven". When not set, it defaults to "maven". For root modules also using rules_jvm_external, the name clash causes a warning:

```
DEBUG: $TMP/external/rules_jvm_external~/private/extensions/maven.bzl:154:14:
The maven repository 'maven' is used in two different bazel modules,
originally in '<my_workspace>' and now in 'protobuf'
```

Summarizing @shs96c in [1]:

> The common maven repo name allows rulesets to contribute to the user's JARs.
> However, this implies that maven is for the end user, not for transitive
> dependencies. If a ruleset needs private dependencies, it should use a custom
> namespace rather than the maven namespace.

Since protobuf is not contributing to user's JARs, we'll use a custom namespace. There's precedent for using a custom namespace for library modules:

- rules_jvm_external uses `rules_jvm_external_deps` instead of `maven`.
- rules_kotlin uses `kotlin_rules_maven` instead of `maven`.

[1]: bazel-contrib/rules_jvm_external#916 (comment)

Fixes #16839.

Closes #18641

COPYBARA_INTEGRATE_REVIEW=#18641 from jschaf:joe/protobuf-maven bd2c62f
PiperOrigin-RevId: 684625084

MODULE.bazel

@@ -131,6 +131,7 @@ use_repo(pip, "pip_deps")
 maven = use_extension("@rules_jvm_external//:extensions.bzl", "maven")
 
 maven.install(
+    name = "protobuf_maven",
     artifacts = [
         "com.google.caliper:caliper:1.0-beta-3",
         "com.google.code.findbugs:jsr305:3.0.2",
@@ -151,7 +152,7 @@ maven.install(
     ],
 )
 
-use_repo(maven, "maven")
+use_repo(maven, "protobuf_maven")
 
 # Development dependencies
 bazel_dep(

WORKSPACE

@@ -59,6 +59,7 @@ rules_jvm_external_setup()
 load("@rules_jvm_external//:defs.bzl", "maven_install")
 
 maven_install(
+    name = "protobuf_maven",
     artifacts = PROTOBUF_MAVEN_ARTIFACTS,
     # For updating instructions, see:
     # https://github.com/bazelbuild/rules_jvm_external#updating-maven_installjson
@@ -69,7 +70,7 @@ maven_install(
     ],
 )
 
-load("@maven//:defs.bzl", "pinned_maven_install")
+load("@protobuf_maven//:defs.bzl", "pinned_maven_install")
 
 pinned_maven_install()
 

java/core/BUILD.bazel

@@ -391,8 +391,8 @@ protobuf_java_library(
         ":generic_test_protos_java_proto",
         ":java_test_protos_java_proto",
         ":lite_test_protos_java_proto",
-        "@maven//:com_google_guava_guava",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:junit_junit",
     ],
 )
 
@@ -442,10 +442,10 @@ junit_tests(
         ":java_test_protos_java_proto",
         ":lite_test_protos_java_proto",
         ":test_util",
-        "@maven//:com_google_guava_guava",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
-        "@maven//:org_mockito_mockito_core",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
+        "@protobuf_maven//:org_mockito_mockito_core",
     ],
 )
 
@@ -461,9 +461,9 @@ junit_tests(
     ],
     deps = [
         ":core",
-        "@maven//:com_google_guava_guava",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
     ],
 )
 
@@ -518,8 +518,8 @@ protobuf_java_library(
         ":java_test_protos_java_proto_lite",
         ":lite_runtime_only",
         ":lite_test_protos_java_proto_lite",
-        "@maven//:com_google_guava_guava",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:junit_junit",
     ],
 )
 
@@ -586,9 +586,9 @@ junit_tests(
         ":lite",
         ":lite_test_protos_java_proto_lite",
         ":test_util_lite",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
-        "@maven//:org_mockito_mockito_core",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
+        "@protobuf_maven//:org_mockito_mockito_core",
     ],
 )
 
@@ -602,8 +602,8 @@ protobuf_java_library(
     deps = [
         ":core",
         "//compatibility:v25_test_protos_srcjar",
-        "@maven//:com_google_guava_guava",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:junit_junit",
     ],
 )
 
@@ -634,10 +634,10 @@ junit_tests(
         ":core",
         ":v25_test_util_srcjar",
         "//compatibility:v25_test_protos_srcjar",
-        "@maven//:com_google_guava_guava",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
-        "@maven//:org_mockito_mockito_core",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
+        "@protobuf_maven//:org_mockito_mockito_core",
     ],
 )
 
@@ -651,8 +651,8 @@ protobuf_java_library(
     deps = [
         ":core",
         "//compatibility:v25_test_protos_jar",
-        "@maven//:com_google_guava_guava",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:junit_junit",
     ],
 )
 
@@ -683,10 +683,10 @@ junit_tests(
         ":core",
         ":v25_test_util_jar",
         "//compatibility:v25_test_protos_jar",
-        "@maven//:com_google_guava_guava",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
-        "@maven//:org_mockito_mockito_core",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
+        "@protobuf_maven//:org_mockito_mockito_core",
     ],
 )
 

java/internal/BUILD.bazel

@@ -18,7 +18,7 @@ java_test(
     srcs = ["JavaVersionTest.java"],
     test_class = "JavaVersionTest",
     deps = [
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
     ],
 )

java/kotlin-lite/BUILD.bazel

@@ -114,8 +114,8 @@ kt_jvm_library(
         "//java/kotlin:only_for_use_in_proto_generated_code_its_generator_and_tests",
         "//java/kotlin:shared_runtime",
         "//java/lite",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
         "@rules_kotlin//kotlin/compiler:kotlin-test",
     ],
 )
@@ -210,8 +210,8 @@ kt_jvm_library(
     deps = [
         ":kotlin_unittest_lite",
         "//java/core:test_util_lite",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
     ],
 )
 
@@ -227,8 +227,8 @@ kt_jvm_library(
     deps = [
         ":kotlin_proto3_unittest_lite",
         "//java/core:test_util_lite",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
     ],
 )
 

java/kotlin/BUILD.bazel

@@ -116,8 +116,8 @@ kt_jvm_library(
     deps = [
         ":bytestring_lib",
         "//java/lite",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
         "@rules_kotlin//kotlin/compiler:kotlin-test",
     ],
 )
@@ -151,9 +151,9 @@ kt_jvm_library(
         ":example_extensible_message_java_proto",
         ":only_for_use_in_proto_generated_code_its_generator_and_tests",
         ":shared_runtime",
-        "@maven//:com_google_guava_guava_testlib",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_guava_guava_testlib",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
         "@rules_kotlin//kotlin/compiler:kotlin-test",
     ],
 )
@@ -177,8 +177,8 @@ kt_jvm_library(
         ":only_for_use_in_proto_generated_code_its_generator_and_tests",
         ":shared_runtime",
         "//java/core",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
         "@rules_kotlin//kotlin/compiler:kotlin-test",
     ],
 )
@@ -289,8 +289,8 @@ kt_jvm_library(
     deps = [
         ":kotlin_unittest",
         "//java/core:test_util",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
         "@rules_kotlin//kotlin/compiler:kotlin-reflect",
     ],
 )
@@ -307,8 +307,8 @@ kt_jvm_library(
     deps = [
         ":kotlin_proto3_unittest",
         "//java/core:test_util",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
     ],
 )
 

java/lite/BUILD.bazel

@@ -76,8 +76,8 @@ junit_tests(
         "//java/core:java_test_protos_java_proto_lite",
         "//java/core:lite_test_protos_java_proto_lite",
         "//java/core:test_util_lite",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
     ],
 )
 

java/osgi/BUILD.bazel

@@ -9,8 +9,8 @@ java_binary(
     srcs = ["OsgiWrapper.java"],
     main_class = "com.google.protobuf.osgi.OsgiWrapper",
     deps = [
-        "@maven//:biz_aQute_bnd_biz_aQute_bndlib",
-        "@maven//:com_google_guava_guava",
-        "@maven//:info_picocli_picocli",
+        "@protobuf_maven//:biz_aQute_bnd_biz_aQute_bndlib",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:info_picocli_picocli",
     ],
 )

java/util/BUILD.bazel

@@ -13,11 +13,11 @@ java_library(
     visibility = ["//visibility:public"],
     deps = [
         "//java/core",
-        "@maven//:com_google_code_findbugs_jsr305",
-        "@maven//:com_google_code_gson_gson",
-        "@maven//:com_google_errorprone_error_prone_annotations",
-        "@maven//:com_google_guava_guava",
-        "@maven//:com_google_j2objc_j2objc_annotations",
+        "@protobuf_maven//:com_google_code_findbugs_jsr305",
+        "@protobuf_maven//:com_google_code_gson_gson",
+        "@protobuf_maven//:com_google_errorprone_error_prone_annotations",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:com_google_j2objc_j2objc_annotations",
     ],
 )
 
@@ -33,11 +33,11 @@ protobuf_versioned_java_library(
     visibility = ["//visibility:public"],
     deps = [
         "//java/core",
-        "@maven//:com_google_code_findbugs_jsr305",
-        "@maven//:com_google_code_gson_gson",
-        "@maven//:com_google_errorprone_error_prone_annotations",
-        "@maven//:com_google_guava_guava",
-        "@maven//:com_google_j2objc_j2objc_annotations",
+        "@protobuf_maven//:com_google_code_findbugs_jsr305",
+        "@protobuf_maven//:com_google_code_gson_gson",
+        "@protobuf_maven//:com_google_errorprone_error_prone_annotations",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:com_google_j2objc_j2objc_annotations",
     ],
 )
 
@@ -90,10 +90,10 @@ junit_tests(
         ":util",
         "//java/core",
         "//java/core:generic_test_protos_java_proto",
-        "@maven//:com_google_code_gson_gson",
-        "@maven//:com_google_guava_guava",
-        "@maven//:com_google_truth_truth",
-        "@maven//:junit_junit",
+        "@protobuf_maven//:com_google_code_gson_gson",
+        "@protobuf_maven//:com_google_guava_guava",
+        "@protobuf_maven//:com_google_truth_truth",
+        "@protobuf_maven//:junit_junit",
     ],
 )