--- old/agent/src/share/classes/sun/jvm/hotspot/tools/HeapSummary.java	2015-10-30 19:14:40.704475298 +0100
+++ new/agent/src/share/classes/sun/jvm/hotspot/tools/HeapSummary.java	2015-10-30 19:14:40.600475294 +0100
@@ -268,8 +268,8 @@
             VM vm = VM.getVM();
             SystemDictionary sysDict = vm.getSystemDictionary();
             InstanceKlass strKlass = sysDict.getStringKlass();
-            // String has a field named 'value' of type 'char[]'.
-            stringValueField = (OopField) strKlass.findField("value", "[C");
+            // String has a field named 'value' of type 'byte[]'.
+            stringValueField = (OopField) strKlass.findField("value", "[B");
          }
 
          private long stringSize(Instance instance) {