WebSphere MQ messaging provider activation specification advanced properties

Use this panel to view or change the advanced properties of the selected activation specification for use with the WebSphere® MQ messaging provider. These advanced properties control the behavior of connections made to WebSphere MQ messaging provider destinations.

To view WebSphere MQ activation specification advanced properties, use the administrative console to complete the following steps:
  1. In the navigation pane, click Resources > JMS->Activation specifications to display existing activation specifications.
  2. If appropriate, in the content pane, change the Scope setting to the level at which the activation specifications are defined. This restricts the set of activation specifications displayed.
  3. Select the name of the activation specification that you want to work with.
  4. In the content pane, under Additional properties, click Advanced properties to view a list of the advanced properties of the WebSphere MQ activation specification.
Under General Properties there are four groups of properties:
  • Message compression
  • Connection consumer
  • Message format
  • Additional

Make any required changes to these groups and then click Apply to return to the activation specification.

Notes: When specifying WebSphere MQ properties, the following restrictions apply:
  • Names can have a maximum of 48 characters, with the exception of channels, which have a maximum of 20 characters.
  • The property values that you specify must match the values that you specified when configuring WebSphere MQ for JMS resources. For more information about configuring WebSphere MQ for JMS resources, see the Using Java section of the WebSphere MQ documentation.

A WebSphere MQ activation specification has the following advanced properties.

Compress message headers

An option that enables the compression of message headers.

Information Value
Data type Check box
Default Cleared
Range
Cleared
Do not compress message headers.
Selected
Compress message headers.

Compression algorithm for message payloads

The compression algorithm that is used to compress message payloads.

Information Value
Data type Drop-down list
Default NONE
Range
RLE
Message data compression is performed using run-length encoding.
ZLIBFAST
Message data compression is performed using ZLIB encoding with speed prioritized.
ZLIBHIGH
Message data compression is performed using ZLIB encoding with compression prioritized.
NONE
No message data compression is performed.

Retain messages, even if no matching consumer is available

An option that determines whether messages for which there is no matching consumer are retained on the input queue or dealt with according with their disposition options.

Information Value
Data type Check box
Default Selected
Range
Cleared
Do not retain messages.
Selected
Retain messages.

Rescan interval

When using a WebSphere MQ Version 6 queue manager (or WebSphere MQ for z/OS® Version 5.3 ), this setting configures the mechanism that is used to dispatch messages to JMS asynchronous consumers.

This setting is used when the set of WebSphere MQ queues that is being asynchronously consumed from exceeds the number of threads that are available internally to synchronously get messages from the WebSphere MQ queue. The setting determines how long a thread retrieves messages from a WebSphere MQ queue before switching to consume messages from another WebSphere MQ queue in the set.

Information Value
Data type Integer
Units Milliseconds
Default 5000
Range A value greater than zero.

Maximum server sessions

The maximum number of server sessions in the server session pool that is used by the connection consumer.

Information Value
Data type Integer
Default 10
Range A value greater than zero.

Server session pool timeout

The period of time, in milliseconds, that an unused server session is held open in the server session pool before being closed due to inactivity.

Information Value
Data type Integer
Units Milliseconds
Default 300,000
Range A value greater than zero.

Start timeout

The period of time, in milliseconds, within which delivery of a message to a message-driven bean (MDB) must start after the work to deliver the message has been scheduled. If this period of time elapses, the message is rolled back onto the queue.

Information Value
Data type Integer
Units Milliseconds
Default 10,000
Range A value greater than zero.

Coded character set identifier

The character set to use when you are encoding strings in the message.

The coded character set identifier (CCSID) is only applicable for activation specification advanced properties if your messaging system is using WebSphere MQ Version 6.0. If you are using WebSphere MQ Version 7.0 you must define the CCSID that you want to use for your messages at your queue destination. For more information on how to do this, see WebSphere MQ Provider queue destination settings for application clients.

If your application constructs messages for a WebSphere MQ application that requires a different character or numeric encoding, you can override the character encoding value by setting the JMS_IBM_Character_Set property to the required coded character set ID (CCSID), or the JMS_IBM_Encoding property to the required numeric format, or both. For information about the values you can use for JMS_IBM_Character_Set and JMS_IBM_Encoding, see the WebSphere MQ information center.

Information Value
Data type Integer
Default 819
Range A value greater than zero. The value must be one of the CCSIDs supported by WebSphere MQ.

For more information about supported CCSIDs, and about converting between message data from one coded character set to another, see the System Administration and the Application Programming Reference sections of the WebSphere MQ documentation.

Fail JMS method calls if the WebSphere MQ queue manager is quiescing

An option that enables selected JMS operations to fail when the queue manager is put into a quiescing state. Selecting this option enables the queue manager to quiesce successfully and shut down.

Information Value
Data type Check box
Default Selected
Range
Cleared
Do not fail JMS operations if the queue manager is quiescing.
Selected
Fail JMS operations if the queue manager is quiescing.

Stop endpoint if message delivery fails

An option that determines whether message delivery is suspended to a failing endpoint.

Information Value
Data type Check box
Default Selected
Range
Cleared
Message delivery is not suspended to a failing endpoint.
Selected
Message delivery is suspended to a failing endpoint when the value for the Number of sequential delivery failures before suspending endpoint is exceeded.

Number of sequential delivery failures before suspending endpoint

The number of sequential message delivery failures to an endpoint that are allowed before message delivery to that endpoint is suspended. This property is enabled only when Stop endpoint if message delivery fails is selected.

Information Value
Data type Integer
Default 0
Range A value greater than or equal to zero.