Enable a limited set of Error Prone errors/warnings by default

Change-Id: Idd588ee289e3576753a5b06a55ca4c36b5293012

.bazelrc

@@ -3,6 +3,7 @@ build --repository_cache=~/.gerritcodereview/bazel-cache/repository
 build --experimental_strict_action_env
 build --action_env=PATH
 build --disk_cache=~/.gerritcodereview/bazel-cache/cas
+build --java_toolchain //tools:error_prone_warnings_toolchain
 
 test --build_tests_only
 test --test_output=errors

Documentation/dev-bazel.txt

@@ -219,10 +219,11 @@ The output JAR file will be be placed in:
 Note that when building an individual plugin, the `core.zip` package
 is not regenerated.
 
+By default, a limited set of Error Prone errors and warnings are enabled.
 To build with all Error Prone warnings activated, run:
 
 ----
-  bazel build --java_toolchain //tools:error_prone_warnings_toolchain //...
+  bazel build --java_toolchain //tools:full_error_prone_warnings_toolchain //...
 ----
 
 

tools/BUILD

@@ -23,10 +23,31 @@ default_java_toolchain(
     visibility = ["//visibility:public"],
 )
 
+default_java_toolchain(
+    name = "full_error_prone_warnings_toolchain",
+    bootclasspath = ["@bazel_tools//tools/jdk:platformclasspath.jar"],
+    jvm_opts = JDK9_JVM_OPTS,
+    package_configuration = [
+        ":full_error_prone",
+    ],
+    visibility = ["//visibility:public"],
+)
+
+# Error Prone errors and warnings enabled by default; see ../.bazelrc for how
+# this is enabled.
+java_package_configuration(
+    name = "error_prone",
+    javacopts = [
+        "-XepDisableWarningsInGeneratedCode",
+        "-Xep:WildcardImport:ERROR",
+    ],
+    packages = ["error_prone_packages"],
+)
+
 # This EP warnings list is based on:
 # https://github.com/bazelbuild/BUILD_file_generator/blob/master/tools/bazel_defs/java.bzl
 java_package_configuration(
-    name = "error_prone",
+    name = "full_error_prone",
     javacopts = [
         "-XepDisableWarningsInGeneratedCode",
         "-Xep:MissingCasesInEnumSwitch:ERROR",