src/jdk.charsets/share/classes/sun/nio/cs/ext/ISO2022_CN_GB.java

@@ -66,11 +66,11 @@
     private static class Encoder extends ISO2022.Encoder {
 
         public Encoder(Charset cs)
         {
             super(cs);
-            SODesig = "$)A";
+            SODesig = new byte[] { '$', ')', 'A'};
 
             try {
                 Charset cset = Charset.forName("EUC_CN"); // GB2312
                 ISOEncoder = cset.newEncoder();
             } catch (Exception e) { }