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From David Jencks <>
Subject Re: How can I get a reference to Geronimo TransactionManager instance...
Date Thu, 16 Feb 2006 21:40:43 GMT

On Feb 16, 2006, at 9:30 AM, Claudio Corsi wrote:

> David Jencks wrote:
>> On Feb 16, 2006, at 8:42 AM, Claudio Corsi wrote:
>>> Hi all,
>>> I was wondering if you have a standard process to get an  
>>> instance  of Geronimo TransactionManager instance?
>>> I have been trying to understand your use of the gbean package  
>>> and  it is not readily clear how I can get an instance of the   
>>> TransactionManager and/or TransactionContextManager instance.
>> Knowing what kind of component needs the TM or TCM would be a  
>> help.   One way for a non-geronimo-aware component to use the TCM  
>> is  demonstrated in the spring tm in the spring module in trunk.
> Hi Dave,
> Thanks for the reply.
> The problem is that I will not know a priori which component is  
> using the TM/TCM.
> Let me describe our product. We have a product called ObjectStore  
> JMTL. This product has the ability to implicitly enlist itself as  
> an XAResource with any jta aware app. The way that we implement  
> this feature is by getting a reference to a TM and using this  
> instance to get the current TXN to enlist ourselves. This work is  
> jta implementation specific since there is no standard way to  
> access a TM.
> Our reason for implementing this was so that our users do not need  
> to explicitly enlist themselves.
> I've looked at the STM implementation and it still requires a TCM  
> name. The question is if this name is unique per application server  
> instance? If it is, how can I get a reference to that unique name?  
> If it is not, how can I determine which one is currently be used?

We need a easier way for non-geronimo stuff to access our components :-)

You should be able to get the TCM name using a GBeanQuery like this:

List names = kernel.listGBeans(new GBeanQuery(null,  

This ought to have only one name in it.  I should change the STM to  
use this.

In order to participate in recovery, your XAResource has to actually  
implement NamedXAResource and supply a name that will be the same  
each time your component instance starts.

Usually to start a service in geronimo it is easiest to wrap it in a  
gbean.  If you do this you can more easily get the TCM by simply  
having a gbean reference  to it.

david jencks

> thanks,
> --Claudio
>> thanks
>> david jencks
>>> thanks,
>>> --Claudio

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