--- a/langtools/make/tools/propertiesparser/parser/MessageFile.java	Wed Jun 14 20:05:01 2017 +0000
+++ b/langtools/make/tools/propertiesparser/parser/MessageFile.java	Thu Jun 15 13:44:42 2017 +0200
@@ -54,7 +54,7 @@
             if (line.startsWith(keyPrefix + ".")) {
                 int eq = line.indexOf("=");
                 if (eq > 0)
-                    messages.put(line.substring(0, eq), new Message(currLine));
+                    messages.put(line.substring(0, eq).trim(), new Message(currLine));
             }
         }
     }