FULL PRODUCT VERSION :
java version "1.6.0_16"
Java(TM) SE Runtime Environment (build 1.6.0_16-b01)
Java HotSpot(TM) Client VM (build 14.2-b01, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
A few seconds after connecting a JVM with JConsole, connection is closed. Running JConsole with -debug option shows, the reason is sun.management.MemoryUsageCompositeData.validateCompositeData throws java.io.InvalidObjectException.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
* Open JConsole with -debug option
* Connect to any local JVM (for example JConsole itself)
* After a few seconds, JConsole displays a "Connection lost" message

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
JConsole should show information about connected JVM.
ACTUAL -
Connection is lost

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.reflect.UndeclaredThrowableException
at $Proxy5.getHeapMemoryUsage(Unknown Source)
at sun.tools.jconsole.SummaryTab.formatSummary(SummaryTab.java:191)
at sun.tools.jconsole.SummaryTab$1.doInBackground(SummaryTab.java:74)
at sun.tools.jconsole.SummaryTab$1.doInBackground(SummaryTab.java:72)
at javax.swing.SwingWorker$1.call(SwingWorker.java:278)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at javax.swing.SwingWorker.run(SwingWorker.java:317)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.io.InvalidObjectException: Failed to invoke from(CompositeData)
at com.sun.jmx.mbeanserver.OpenConverter.invalidObjectException(OpenConverter.java:1403)
at com.sun.jmx.mbeanserver.OpenConverter$CompositeBuilderViaFrom.fromCompositeData(OpenConverter.java:1007)
at com.sun.jmx.mbeanserver.OpenConverter$CompositeConverter.fromNonNullOpenValue(OpenConverter.java:903)
at com.sun.jmx.mbeanserver.OpenConverter.fromOpenValue(OpenConverter.java:110)
at com.sun.jmx.mbeanserver.ConvertingMethod.fromOpenReturnValue(ConvertingMethod.java:117)
at com.sun.jmx.mbeanserver.MXBeanProxy.invoke(MXBeanProxy.java:149)
at javax.management.MBeanServerInvocationHandler.invoke(MBeanServerInvocationHandler.java:248)
... 11 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.sun.jmx.mbeanserver.OpenConverter$CompositeBuilderViaFrom.fromCompositeData(OpenConverter.java:1004)
... 16 more
Caused by: java.lang.IllegalArgumentException: Unexpected composite type for MemoryUsage
at sun.management.MemoryUsageCompositeData.validateCompositeData(MemoryUsageCompositeData.java:107)
at java.lang.management.MemoryUsage.<init>(MemoryUsage.java:161)
at java.lang.management.MemoryUsage.from(MemoryUsage.java:282)
... 21 more

REPRODUCIBILITY :
This bug can be reproduced always.