Update javac version to 9-dev-r4023-2

Fixes bazelbuild#2979

Change-Id: I23e38767e18a90b2262a38bf8f4b347e06d1de8d

third_party/README.md

@@ -166,7 +166,7 @@ a minimal set of extra dependencies.
 
 ## [javac](https://github.com/google/error-prone-javac)
 
-* Version: 9-dev-r4023-1 (javac-9-dev-r4023-1.jar)
+* Version: 9-dev-r4023-2 (javac-9-dev-r4023-2.jar)
 * License: GNU GPL v2 with Classpath exception (plus other licenses, see third_party/java/jdk/langtools/LICENSE file).
 
 ## [jarjar](https://code.google.com/p/jarjar/)

third_party/java/jdk/README.md

@@ -10,7 +10,7 @@ version of the JRE. Those builds are vendored in
 //third_party/java/jdk/langtools.
 
 Currently Bazel supports running on a JRE 8 only because the default Java
-compiler used (//third_party/java/jdk/langtools/javac-9-dev-r3297-4.jar) is the
+compiler used (//third_party/java/jdk/langtools/javac-9-dev-r4023-2.jar) is the
 Java compiler of OpenJDK 9 compiled to run on a JRE 8. This cannot
 be built to run on a JRE 7 because of code incompatibility. Bazel's
 JavaBuilder at HEAD cannot be linked with earlier version of the

third_party/java/jdk/langtools/BUILD

@@ -19,40 +19,40 @@ filegroup(
         "//conditions:default": [
             "BUILD",
             "LICENSE",
-            "javac-9-dev-r4023-1.jar",
-            "javac-9-dev-r4023-1.srcjar",
+            "javac-9-dev-r4023-2.jar",
+            "javac-9-dev-r4023-2.srcjar",
         ],
     }),
 )
 
 java_import(
     name = "javac",
-    jars = ["javac-9-dev-r4023-1.jar"],
+    jars = ["javac-9-dev-r4023-2.jar"],
 )
 
 filegroup(
     name = "javac_jar",
     srcs = select({
         "//tools/jdk:jdk7": ["javac7.jar"],
-        "//conditions:default": ["javac-9-dev-r4023-1.jar"],
+        "//conditions:default": ["javac-9-dev-r4023-2.jar"],
     }),
 )
 
 # TODO(cushon): delete
 alias(
-    name = "test-srcs-9-dev-r4023-1",
+    name = "test-srcs-9-dev-r4023-2",
     actual = ":test-srcs",
 )
 
 # TODO(cushon): delete
 alias(
-    name = "javac-9-dev-r4023-1",
+    name = "javac-9-dev-r4023-2",
     actual = ":javac",
 )
 
 # TODO(cushon): delete
 alias(
-    name = "javac_jar-9-dev-r4023-1",
+    name = "javac_jar-9-dev-r4023-2",
     actual = ":javac_jar",
 )