We just switched to the new Proto library build rules in the [instrumentation-proto](https://github.com/google/instrumentation-proto) repository, by following the instructions at https://bazel.build/blog/index.html#protocol-buffers-in-bazel. Here is the pull request: https://github.com/google/instrumentation-proto/pull/26

Start by reproducing the supplied bazel build :stats-core_impl command with the listed --javacopt flags and inspect the com_google_protobuf_java target referenced from WORKSPACE. Compare the behavior after the instrumentation-proto build-rule change and determine the precise expected handling of dependency warnings and java_proto_library; the issue is complete only when that behavior is agreed and verified.

We just switched to the new Proto library build rules in the instrumentation-proto repository, by following the instructions at https://bazel.build/blog/index.html#protocol-buffers-in-bazel. Here is the pull request: https://github.com/google/instrumentation-proto/pull/26

Then we updated a git submodule to bring the changes into instrumentation-java, as in this commit: https://github.com/sebright/instrumentation-java/commit/95a6691ea8705f28c9b8a7a7f6ce3fa9d6b1c692

We were building instrumentation-java with --javacopt=-Werror --javacopt=-Xlint:all in CI. After the change, we started getting many errors that seemed to come from the com_google_protobuf_java http_archive target in our WORKSPACE file. Here is part of the list of errors from the failed Travis build:

ERROR: /home/travis/.cache/bazel/_bazel_travis/43f33de0ac8ec257b07378061caba359/external/com_google_protobuf_java/BUILD:553:1: Java compilation in rule '@com_google_protobuf_java//:protobuf_java' failed: Worker process sent response with exit code: 1.
external/com_google_protobuf_java/java/core/src/main/java/com/google/protobuf/AbstractMessage.java:55: warning: [rawtypes] found raw type: AbstractMessageLite
    extends AbstractMessageLite
            ^
  missing type arguments for generic class AbstractMessageLite<MessageType,BuilderType>
  where MessageType,BuilderType are type-variables:
    MessageType extends AbstractMessageLite<MessageType,BuilderType> declared in class AbstractMessageLite
    BuilderType extends Builder<MessageType,BuilderType> declared in class AbstractMessageLite
external/com_google_protobuf_java/java/core/src/main/java/com/google/protobuf/AbstractMessage.java:250: warning: [rawtypes] found raw type: List
          List list1 = (List) value1;
          ^
  missing type arguments for generic class List<E>
  where E is a type-variable:
    E extends Object declared in interface List

The full command was:

bazel build :stats-core_impl --javacopt=-Werror --javacopt=-Xlint:all --javacopt=-Xlint:-cast --javacopt=-Xlint:-deprecation --javacopt=-Xlint:-try --verbose_failures

(We were already suppressing some other warnings.)

The full log is at https://travis-ci.org/sebright/instrumentation-java/jobs/212241166 .

Bazel version:

Build label: 0.4.5
Build target: bazel-out/local-fastbuild/bin/src/main/java/com/google/devtools/build/lib/bazel/BazelServer_deploy.jar
Build time: Thu Mar 16 12:19:38 2017 (1489666778)
Build timestamp: 1489666778
Build timestamp as int: 1489666778

I expected bazel to not fail the build in this case, for two reasons:

• com_google_protobuf_java is only a dependency of the project. I think there should be a way to only fail if warnings come from the targets in the BUILD file. (Is there already an option that does that?)
• java_proto_library shouldn't cause errors, because it is a built-in build rule.

/cc @bogdandrutu

Originally posted by @sebright in https://github.com/bazelbuild/bazel/issues/2699 s-out/
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