Connection modes for IBM MQ classes for JMS

An IBM MQ classes for JMS application can connect to a queue manager in either client or bindings mode. In client mode, IBM MQ classes for JMS connects to the queue manager over TCP/IP. In bindings mode, IBM MQ classes for JMS connects directly to the queue manager using the Java Native Interface (JNI).

An application running in WebSphere Application Server on z/OS can connect to a queue manager in either bindings or client mode, but an application running in any other environment on z/OS can connect to a queue manager only in bindings mode. An application running on any other platform can connect to a queue manager in either bindings or client mode.

We can use the current or any earlier supported version of IBM MQ classes for JMS with a current queue manager, and we can use a current or earlier supported version of queue manager with the current version of IBM MQ classes for JMS. If you mix different versions, function is limited to the level of the earlier version.

The following sections describe each of the connection modes in more detail.

Client mode

To connect to a queue manager in client mode, an IBM MQ classes for JMS application can run on the same system on which the queue manager is running, or on a different system. In each case, IBM MQ classes for JMS connects to the queue manager over TCP/IP.

Bindings mode

To connect to a queue manager in bindings mode, an IBM MQ classes for JMS application must run on the same system on which the queue manager is running.

The IBM MQ classes for JMS connects directly to the queue manager using the Java Native Interface (JNI). To use the bindings transport, the IBM MQ classes for JMS must be run in an environment that has access to the IBM MQ Java Native Interface libraries; see Configure the Java Native Interface (JNI) libraries for further information.

• MQCNO_FASTPATH_BINDING
• MQCNO_STANDARD_BINDING
• MQCNO_SHARED_BINDING
• MQCNO_ISOLATED_BINDING
• MQCNO_SERIALIZE_CONN_TAG_QSG
• MQCNO_RESTRICT_CONN_TAG_QSG
• MQCNO_SERIALIZE_CONN_TAG_Q_MGR
• MQCNO_RESTRICT_CONN_TAG_Q_MGR

To change the connection options used by the IBM MQ classes for JMS, modify the Connection Factory property CONNOPT.

For further information on connection options, see Connect to a queue manager using the MQCONNX call

To use the bindings transport, the Java Runtime Environment being used must support the Coded Character Set Identifier (CCSID) of the queue manager that the IBM MQ classes for JMS are connecting to.

Details on how to determine what CCSIDs are supported by a Java Runtime Environment can be found in IBM MQ FDC with Probe ID 21 generated when using the IBM MQ V7 classes for Java or IBM MQ V7 classes for JMS.