The problem is caused by the MavenIntegrationTest.protobufBuilderTest, because it cannot find the required com.google.protobuf:protoc library version for the osx-aarch_64 architecture. Same applies to the io.grpc:protoc-gen-grpc-java library.

mvn-test-protobuf-failure-log.txt

Versions of mentioned libraries used in the parent pom.xml and in the protobuf-maven-plugin are quite old and don't have any support for the osx-aarch_64 architecture.

Minimal versions that allow build to succeed and tests to pass are:

• com.google.protobuf:protoc:3.17.3
• io.grpc:protoc-gen-grpc-java:1.42.1

These versions do not have native support for the osx-aarch_64 architecture, but use this architecture's name as an alias for the osx-x86_64 architecture that is backward compatible via the Rosetta 2 emulator.

I also tried the latest versions of mentioned libraries and they also seem to work fine (i.e. build succeeds and tests pass). io.grpc:protoc-gen-grpc-java still doesn't have native support for osx-aarch_64, but com.google.protobuf:protoc does since version 3.21.0, so I personally would vote for using these latest versions, if that would be possible.

I'm ready to create a pull request if the core team will see no problems with updating the versions of these libraries.