Redirect JVM warnings to stderr in general.

larsrc-google · copybara-github · commit abea37b35191 · 2023-04-17T06:07:16.000-07:00
In particular this avoids problems with JVM warnings clashing with the worker protocol, but also matches Blaze's idea of where output goes better.

PiperOrigin-RevId: 524826411
Change-Id: If4c78ac5f63dfd4596da924c12552f6335b8034d
diff --git a/tools/jdk/default_java_toolchain.bzl b/tools/jdk/default_java_toolchain.bzl
@@ -41,6 +41,11 @@ BASE_JDK9_JVM_OPTS = [
 
     # Compact strings make JavaBuilder slightly slower.
     "-XX:-CompactStrings",
+
+    # Since https://bugs.openjdk.org/browse/JDK-8153723, JVM logging goes to stdout. This
+    # makes it go to stderr instead.
+    "-Xlog:disable",
+    "-Xlog:all=warning:stderr:uptime,level,tags",
 ]
 
 JDK9_JVM_OPTS = BASE_JDK9_JVM_OPTS
