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Status Under review
Created by Guest
Created on Aug 28, 2024

Provide support for MQ Classes for JMS in Liberty

RFE to provide support for MQ Classes for JMS in Liberty:

Migrating Applications from tWAS that use MQ Classes for JMS or MQ Classes for Java to another J2EE environment not supported for Liberty, but is supported for any other J2EE environment.

As per the documentation here https://www.ibm.com/support/pages/node/727251 Liberty is the only J2EE environment that support is not provided for MQ Classes for Java and the MQ allclient.jar.

This support limitation, for Liberty only, also includes support of the MQ Classes for JMS.

Migrating applications that utilise MQ Classes for JMS from tWAS to Liberty would involve (at a minimum):

  1. Rewriting applications to use the J2EE JMS APIs (javax.jms)

  2. Moving configuration of client-side access to MQ resources from the application into Liberty Application Server configuration.

  3. This would include translating from programmatically setting something like WMQ_TARGET_CLIENT to a property in server config like targetClientId. It is unclear if there are mappings for every configurable property currently in use and whether defaults remain the same across the different APIs.

  4. Switching from non-J2EE MQ resources in tWAS to J2EE (managed) resources in Liberty.

NOTE point 4 above is a significant risk to the migration project that could require a major refactoring of the application. Currently in tWAS, the MQ client-side resources are not managed by J2EE so, for example, do not interact with the JTA transaction context.

The current migration path to Liberty requires changing the MQ resources to J2EE managed resources that do interact with J2EE components such as the JTA transaction service.

Idea priority Urgent
  • Admin
    Mark Taylor
    Reply
    |
    Dec 10, 2024

    RRB: Sounds like any devt work would need to be done by Liberty (testing by MQ). As Liberty want this for migration scenarios, send to prioritisation

  • Admin
    Mark Taylor
    Reply
    |
    Oct 7, 2024

    Note: despite the title and description, this is nothing to do with JMS. It's about the MQ BASE Java classes. The JMS classes are, as you would expect, fully supported in Liberty.