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Thank you for the suggestion. The requirement does have merit, but looking at it with respect to our total backlog of requests we do not see sufficient interest in this enhancement to merit delivery any time in the foreseeable future. Given the unlikelihood that we would deliver this, we are declining the request rather than leaving it in an uncommitted state for an extended period of time. If you would like to discuss this decision further, please contact Graham Charters <email@example.com>.
To clarify, the session.sharing.scope property that was introduced in the fix for APAR PK59605 is a custom property that can be set on an MQ ConnectionFactory definition.
Setting the property does not change the behaviour of Connections created from this factory, but sets whether Sessions created from those Connections (it is the Sessions, not the Connections that are enlisted in transactions) are created as shareable or unshareable.
ConnectionFactories contain all the details that are used when connecting to an MQ queue manager (such as port, channel and clientID) and so it would be normal practice to have different ConnectionFactories for different applications.
What this means is that the session.sharing.scope property is not strictly a server-level setting, rather it is a ConnectionFactory setting, and we would usually expect a 1-1 relationship between a ConnectionFactory and an application. Thus, it is already possible to use the existing custom property to define the sharable/unshareable behaviour of JMS Sessions at an effectively application level.