fix: [gax-java] Add speedy Bazel builds to Travis

.travis.yml

@@ -6,10 +6,28 @@ addons:
   hosts:
     - fake-hostname-to-work-around-travis-bug
   hostname: fake-hostname-to-work-around-travis-bug
-jdk:
-  - openjdk8
-  - openjdk7
-install: ./gradlew assemble
-script: ./gradlew build install
-after_success:
-  - bash <(curl -s https://codecov.io/bash)
+
+jobs:
+  include:
+  - name: Java 7 Build
+    jdk: openjdk7
+    install: ./gradlew assemble
+    script: ./gradlew build install
+    after_success:
+      - bash <(curl -s https://codecov.io/bash)
+
+  - name: Java 8 Build
+    jdk: openjdk8
+    before_install:
+      - wget https://github.com/bazelbuild/bazel/releases/download/3.5.0/bazel_3.5.0-linux-x86_64.deb
+      - wget https://github.com/bazelbuild/bazel/releases/download/3.5.0/bazel_3.5.0-linux-x86_64.deb.sha256
+      - sha256sum -c bazel_3.5.0-linux-x86_64.deb.sha256
+      - sudo dpkg -i bazel_3.5.0-linux-x86_64.deb
+    install: ./gradlew assemble
+    script:
+      - ./gradlew build install
+      # The Bazel flags below are the best we can do to optimize build speed, since caching on Travis
+      # is suboptimal for various reasons (see https://kevin.burke.dev/kevin/bazel-tests-on-travis-ci/).
+      -  bazel --batch test //... --noshow_progress --test_output=errors
+    after_success:
+      - bash <(curl -s https://codecov.io/bash)

dependencies.properties

@@ -26,6 +26,7 @@ version.gax_httpjson=0.75.3-SNAPSHOT
 version.com_google_protobuf=3.12.2
 version.google_java_format=1.1
 version.io_grpc=1.30.0
+version.bazel_skylib=1.0.3
 
 # Maven artifacts.
 # Note, the actual name of each property matters (bazel build scripts depend on it).
@@ -45,6 +46,7 @@ maven.com_google_code_findbugs_jsr305=com.google.code.findbugs:jsr305:3.0.2
 maven.com_google_errorprone_error_prone_annotations=com.google.errorprone:error_prone_annotations:2.3.4
 maven.com_google_j2objc_j2objc_annotations=com.google.j2objc:j2objc-annotations:1.3
 maven.com_google_auto_value_auto_value=com.google.auto.value:auto-value:1.4
+maven.com_google_auto_value_auto_value_annotations=com.google.auto.value:auto-value-annotations:1.7.2
 maven.com_google_api_api_common=com.google.api:api-common:1.9.3
 maven.org_threeten_threetenbp=org.threeten:threetenbp:1.4.1
 maven.com_google_api_grpc_grpc_google_iam_v1=com.google.api.grpc:grpc-google-iam-v1:0.13.0

gax-grpc/BUILD.bazel

@@ -1,4 +1,4 @@
-load("//:gax_java.bzl", "java_tests", "google_java_format", "google_java_format_verification")
+load("//:gax_java.bzl", "google_java_format", "google_java_format_verification", "java_tests")
 
 _JAVA_COPTS = [
     "-source",
@@ -21,6 +21,7 @@ _COMPILE_DEPS = [
     "@com_google_api_grpc_proto_google_common_protos//jar",
     "@com_google_api_api_common//jar",
     "@com_google_auto_value_auto_value//jar",
+    "@com_google_auto_value_auto_value_annotations//jar",
     "@com_google_http_client_google_http_client//jar",
     "@io_grpc_grpc_java//context:context",
     "@io_grpc_grpc_netty_shaded//jar",

gax-httpjson/BUILD.bazel

@@ -1,4 +1,4 @@
-load("//:gax_java.bzl", "java_tests", "google_java_format", "google_java_format_verification")
+load("//:gax_java.bzl", "google_java_format", "google_java_format_verification", "java_tests")
 
 _JAVA_COPTS = [
     "-source",
@@ -17,6 +17,7 @@ _COMPILE_DEPS = [
     "@com_google_auth_google_auth_library_credentials//jar",
     "@com_google_api_api_common//jar",
     "@com_google_auto_value_auto_value//jar",
+    "@com_google_auto_value_auto_value_annotations//jar",
     "@com_google_http_client_google_http_client_jackson2//jar",
     "@javax_annotation_javax_annotation_api//jar",
     "//gax:gax",
@@ -27,7 +28,7 @@ _TEST_COMPILE_DEPS = [
     "@org_mockito_mockito_core//jar",
     "@com_google_truth_truth//jar",
     "//gax:gax_testlib",
-   "@com_googlecode_java_diff_utils_diffutils//jar",
+    "@com_googlecode_java_diff_utils_diffutils//jar",
 ]
 
 java_library(

gax/BUILD.bazel

@@ -1,4 +1,4 @@
-load("//:gax_java.bzl", "java_tests", "google_java_format", "google_java_format_verification")
+load("//:gax_java.bzl", "google_java_format", "google_java_format_verification", "java_tests")
 
 _JAVA_COPTS = [
     "-source",
@@ -12,6 +12,7 @@ _COMPILE_DEPS = [
     "@com_google_auth_google_auth_library_credentials//jar",
     "@com_google_auth_google_auth_library_oauth2_http//jar",
     "@com_google_auto_value_auto_value//jar",
+    "@com_google_auto_value_auto_value_annotations//jar",
     "@com_google_code_findbugs_jsr305//jar",
     "@com_google_guava_guava//jar",
     "@io_opencensus_opencensus_api//jar",

repositories.bzl

@@ -64,11 +64,12 @@ def com_google_api_gax_java_repositories():
         strip_prefix = "grpc-java-%s" % _grpc_version,
     )
 
+    _bazel_skylib_version = PROPERTIES["version.bazel_skylib"]
     _maybe(
         http_archive,
         name = "bazel_skylib",
-        strip_prefix = "bazel-skylib-0.7.0",
-        urls = ["https://github.com/bazelbuild/bazel-skylib/archive/0.7.0.zip"],
+        strip_prefix = "bazel-skylib-%s" % _bazel_skylib_version,
+        urls = ["https://github.com/bazelbuild/bazel-skylib/archive/%s.zip" % _bazel_skylib_version],
     )
 
     _maybe(