Using IBM MQ connection property override

Connection property override allows you to change the details that are used by a client application to connect to a queue manager, without modifying the source code.

About this task

Sometimes, it is not possible to modify the source code for an application, for example, if the application is a legacy application and the source code is no longer available.

In this situation, if an application needs to specify different properties when it is connecting to a queue manager, or is required to connect to a different queue manager, then you can use the connection override functionality to specify the new connection details or queue manager name.

The connection property override is supported for two clients:

You can override the properties that you want to change by defining them in a configuration file that is then read by the IBM MQ classes for JMS or IBM MQ classes for Java at startup.

When the connection override functionality is in use, all applications that are running inside the same Java runtime environment pick up and use the new property values. If multiple applications that are using either the IBM MQ classes for JMS or the IBM MQ classes for Java are running inside the same Java runtime environment, it is not possible to just override properties for individual applications.

Important: This functionality is only supported for situations where it is not possible to modify the source code for an application. It must not be used for applications where the source code is available and can be updated.