Re: [c3p0-users] WARN ActiveManagementCoordinator - A C3P0Registry mbean is already registered

[Lindholm, G. <gli...@ne...>]

Hi Steve,

I believe I'm dealing with a single VM but multiple ClassLoader's.

I'm in Eclipse and fire-up Tomcat 5.5 which starts up 3 servlet=20
contexts/applications, each with it's own DataSource to it's own
database.
I see the Warning when the 2nd and again when the 3rd app starts up.

Once it's running I see 2 javaw.exe's in the process list (Windows XP).
One is for eclipse so the other must be for Tomcat.
I believe that Tomcat loads each context/application with it's=20
own ClassLoader.

Based on your description below I assume it's the multiple ClassLoader's

that is the problem.

This would likely not be a problem in a production configuration as=20
we run each application in a separate Tomcat and VM.

If there's any additional info I can provide you with to help please=20
let me know.

Thanks a lot.

Greg





=20

-----Original Message-----
From: Steve Waldman [mailto:swa...@mc...]=20
Sent: Saturday, March 24, 2007 2:50 PM
To: Lindholm, Greg
Cc: c3p...@li...
Subject: Re: [c3p0-users] WARN ActiveManagementCoordinator - A
C3P0Registry mbean is already registered

Greg,

You can turn all the JMX stuff off if you want to. Just set in =20
c3p0.properties or as a System property...

   =20
com.mchange.v2.c3p0.management.ManagementCoordinator=3Dcom.mchange.v2.c3=
p0

.management.NullManagementCoordinator

And c3p0's JMX support will be turned off.

But I'd like to understand why you are seeing this message. Are your =20
two DataSources both being started in the same VM? (Is it possible =20
that there are DataSources in two different VMs that both share the =20
same JMX MBean registry? This is a case I hadn't planned for, which =20
is a bug, because it is probably common in some application servers. =20
I will fix this.)

If not, if there is only one VM around, is it possible as the message=
 =20
suggests that some c3p0 DataSources from a previous deployment (in =20
the same VM, but a different ClassLoader) were not properly closed? =20
That is what is expected to provoke this message.

I'm going to clean up the C3P0Registry MBean a bit... the registry is=
 =20
a one-per-classloader singleton, but right now it's naming is treated=
 =20
as though it were globally unique. I'll change that. But still, other=
 =20
than in the multiple-VMs-one-registry case, creating two DataSources =20
should not ever provoke this message.

    smiles,
       Steve



On Mar 21, 2007, at 9:22 AM, Lindholm, Greg wrote:

> After upgrading to c3p0 0.9.1.1 I get this warning from
> ActiveManagementCoordinator.attemptManageC3P0Registry():
>
> WARN com.mchange.v2.c3p0.management.ActiveManagementCoordinator:56 -=
 A
> C3P0Registry mbean is already registered. This probably means that an
> application using c3p0 was undeployed, but not all PooledDataSources
> were closed prior to undeployment. This may lead to resource leaks =20
> over
> time. Please take care to close all PooledDataSources.
>
>
> I'm using c3p0 with Hibernate and have 2 separate SessionFactory's =20
> to 2
> different databases.
> When I'm initializing the 2nd SessionFactory and it's creating the 2nd
> PooledDataSource
> I get the warning.
>
> I've set breakpoints and see:
> DataSources.pooledDataSource(unpooledDataSource, props) is called to
> created
> the PooledDataSource.
>
> Up the stack it calls C3P0Registry.reregister(IdentityTokenized idt)
> which
> eventually calls the above.
>
>
> I gather that this ActiveManagementCoordinator is for JMX management
> support (not using at this time.)
>
> My Questions:
>
> - Is there a real problem here or can I simply turn off and ignore the
> warning?
>
> - Is there a configuration property (or program change) I can set too
> make it happy?
>
>
> Thanks
>
> Greg
>
>
>
>
> ----------------------------------------------------------------------

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