[ mx4j-Bugs-855000 ] MBean registration notification emitted too soon

Bugs item #855000, was opened at 2003-12-05 20:41
Message generated for change (Comment added) made by biorn_steedom
You can respond by visiting: 
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Category: JMX implementation
>Group: Release 2.0.0
>Status: Closed
>Resolution: Duplicate
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
>Assigned to: Simone Bordet (biorn_steedom)
Summary: MBean registration notification emitted too soon

Initial Comment:
When an MBean is registered, the MBeanServerDelegate 
will emit a registration notification to all of its listeners.  
Unfortunately, the MBeanServerDelegate emits this 
notification too soon, before the MBean has been fully 
registered.  It is very easy to replicate this bug.

Write a MBean registration listener and add it to the 
MBeanServerDelegate.  In that listener, 
call "getMBeanInfo" on the MBeanServer passing in the 
ObjectName of the newly registered MBean.

Then, register an MBean.  Notice that getMBeanInfo 
returns null.  MX4J hasn't fully initialized its internal data 
structures before it calls the registration notification 
listeners.

It should be that if a registration notification listener's 
handleNotification is called, that MBean should be fully 
registered and the listener should be able to do 
whatever it wants with the bean (at the very least, it 
should be able to get its MBeanInfo).

The current workaround I am using today is the 
handleNotification spawns a thread and returns.  That 
thread will spin waiting for MBeanInfo to return a non-
null.  At that point, I know MX4J has completely 
registered the MBean.

John Mazz
Hewlett-Packard, Company
[email protected]

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>Comment By: Simone Bordet (biorn_steedom)
Date: 2003-12-06 22:48

Message:
Logged In: YES 
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Seems to me a duplicate of #764090 and of #714653, so I'm
closing it as duplicate. John, if that is not the case,
please re-open it.

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Comment By: Brian Scully (btscully)
Date: 2003-12-06 18:08

Message:
Logged In: YES 
user_id=234750

I can't duplicate your testcase with the latest codebase from CVS.  Are you working against 1.1.1 or 2.0 Beta?  If it's not fixed in 2.0 Beta, it is fixed in the nightly snapshot.

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