--- old/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/Hashtable.java	2017-07-18 22:52:31.066661905 -0400
+++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/utilities/Hashtable.java	2017-07-18 22:52:30.734659120 -0400
@@ -27,6 +27,7 @@
 import java.util.*;
 import sun.jvm.hotspot.debugger.*;
 import sun.jvm.hotspot.types.*;
+import sun.jvm.hotspot.oops.*;
 import sun.jvm.hotspot.runtime.*;
 
 public class Hashtable extends BasicHashtable {
@@ -48,6 +49,10 @@
     return HashtableEntry.class;
   }
 
+  public int computeHash(Symbol name) {
+    return (int) name.identityHash();
+  }
+
   public int hashToIndex(long fullHash) {
     return (int) (fullHash % tableSize());
   }