--- old/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZHeap.java	2018-01-13 12:14:32.192606730 +0900
+++ new/src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/gc/z/ZHeap.java	2018-01-13 12:14:31.925606007 +0900
@@ -57,7 +57,7 @@
     }
 
     ZPageTable pageTable() {
-        return new ZPageTable(addr.addOffsetTo(pageTableFieldOffset));
+        return (ZPageTable)VMObjectFactory.newObject(ZPageTable.class, addr.addOffsetTo(pageTableFieldOffset));
     }
 
     public long maxCapacity() {