Index: lucene/core/src/java/org/apache/lucene/util/RamUsageEstimator.java
===================================================================
--- lucene/core/src/java/org/apache/lucene/util/RamUsageEstimator.java	(revision 1499883)
+++ lucene/core/src/java/org/apache/lucene/util/RamUsageEstimator.java	(working copy)
@@ -18,6 +18,7 @@
  */
 
 import java.lang.management.ManagementFactory;
+import java.lang.management.PlatformManagedObject;
 import java.lang.reflect.*;
 import java.text.DecimalFormat;
 import java.text.DecimalFormatSymbols;
@@ -213,11 +214,7 @@
     int objectAlignment = 8;
     try {
       final Class<?> beanClazz = Class.forName("com.sun.management.HotSpotDiagnosticMXBean");
-      final Object hotSpotBean = ManagementFactory.newPlatformMXBeanProxy(
-        ManagementFactory.getPlatformMBeanServer(),
-        "com.sun.management:type=HotSpotDiagnostic",
-        beanClazz
-      );
+      final Object hotSpotBean = ManagementFactory.getPlatformMXBean(beanClazz.asSubclass(PlatformManagedObject.class));
       final Method getVMOptionMethod = beanClazz.getMethod("getVMOption", String.class);
       final Object vmOption = getVMOptionMethod.invoke(hotSpotBean, "ObjectAlignmentInBytes");
       objectAlignment = Integer.parseInt(