--- old/src/jdk.snmp/share/classes/com/sun/jmx/snmp/IPAcl/ParseException.java	2014-08-26 11:23:30.000000000 +0800
+++ new/src/jdk.snmp/share/classes/com/sun/jmx/snmp/IPAcl/ParseException.java	2014-08-26 11:23:29.000000000 +0800
@@ -204,7 +204,7 @@
            default:
               if ((ch = str.charAt(i)) < 0x20 || ch > 0x7e) {
                  String s = "0000" + Integer.toString(ch, 16);
-                 retval.append("\\u" + s.substring(s.length() - 4, s.length()));
+                 retval.append("\\u").append(s.substring(s.length() - 4, s.length()));
               } else {
                  retval.append(ch);
               }