doc/testing.md

@@ -386,10 +386,17 @@
 To run these tests correctly, additional parameters for the correct docker image are
 required on Ubuntu 18.04 by using `JAVA_OPTIONS`.
 
     $ make test TEST="jtreg:test/hotspot/jtreg/containers/docker" JTREG="JAVA_OPTIONS=-Djdk.test.docker.image.name=ubuntu -Djdk.test.docker.image.version=latest"
 
+### Non-English locale just for Linux
+
+If your locale is non-English and when you "make test", it will appear some fail caused by the locale that non-English.
+Then you can try to solve this problem by setting LANG before "make test".
+
+    $ export LANG="en_US"
+
 ---
 # Override some definitions in the global css file that are not optimal for
 # this document.
 header-includes:
  - '<style type="text/css">pre, code, tt { color: #1d6ae5; }</style>'