diff -r e92b3d8118f1 -r 6b2aecc4f7d8 hotspot/agent/src/share/classes/sun/jvm/hotspot/tools/jcore/ClassWriter.java
--- a/hotspot/agent/src/share/classes/sun/jvm/hotspot/tools/jcore/ClassWriter.java	Mon Jun 07 14:17:01 2010 -0700
+++ b/hotspot/agent/src/share/classes/sun/jvm/hotspot/tools/jcore/ClassWriter.java	Wed Jun 09 18:50:45 2010 -0700
@@ -61,10 +61,12 @@
     protected short  _signatureIndex;
 
     protected static int extractHighShortFromInt(int val) {
+        // must stay in sync with constantPoolOopDesc::name_and_type_at_put, method_at_put, etc.
         return (val >> 16) & 0xFFFF;
     }
 
     protected static int extractLowShortFromInt(int val) {
+        // must stay in sync with constantPoolOopDesc::name_and_type_at_put, method_at_put, etc.
         return val & 0xFFFF;
     }
 
@@ -297,6 +299,28 @@
                                         + ", type = " + signatureIndex);
                      break;
                 }
+
+                case JVM_CONSTANT_MethodHandle: {
+                     dos.writeByte(cpConstType);
+                     int value = cpool.getIntAt(ci);
+                     short refIndex = (short) extractHighShortFromInt(value);
+                     byte  refKind  = (byte)  extractLowShortFromInt(value);
+                     dos.writeByte(refKind);
+                     dos.writeShort(refIndex);
+                     if (DEBUG) debugMessage("CP[" + ci + "] = MH index = " + refIndex
+                                        + ", kind = " + refKind);
+                     break;
+                }
+
+                case JVM_CONSTANT_MethodType: {
+                     dos.writeByte(cpConstType);
+                     int value = cpool.getIntAt(ci);
+                     short refIndex = (short) value;
+                     dos.writeShort(refIndex);
+                     if (DEBUG) debugMessage("CP[" + ci + "] = MT index = " + refIndex);
+                     break;
+                }
+
                 default:
                   throw new InternalError("Unknown tag: " + cpConstType);
             } // switch