--- old/src/java.base/share/classes/java/nio/charset/Charset.java	2017-06-27 13:26:32.692028965 +0900
+++ new/src/java.base/share/classes/java/nio/charset/Charset.java	2017-06-27 13:26:32.524028923 +0900
@@ -281,7 +281,7 @@
 
     /* -- Static methods -- */
 
-    private static volatile String bugLevel;
+    private static String bugLevel;
 
     static boolean atBugLevel(String bl) {              // package-private
         String level = bugLevel;