--- a/agent/src/share/classes/sun/jvm/hotspot/utilities/Hashtable.java	Thu Oct 16 10:21:29 2014 +0200
+++ b/agent/src/share/classes/sun/jvm/hotspot/utilities/Hashtable.java	Wed Oct 15 16:02:50 2014 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -61,8 +61,9 @@
     long h = 0;
     int s = 0;
     int len = buf.length;
+    // Emulate the unsigned int in java_lang_String::hash_code
     while (len-- > 0) {
-      h = 31*h + (0xFFL & buf[s]);
+      h = 31*h + (0xFFFFFFFFL & buf[s]);
       s++;
     }
     return h & 0xFFFFFFFFL;