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BP Server Developer's Guide
JMS based event publisher : Event channels : Event channel persistence

Event channel persistence

You can define event channels using Business Process Portal. For more information about defining event channels, see "Chapter 11, Managing event channels" in Business Process Portal Administrator’s Guide.
You can also specify an expiration date for an event channel. When an expiration date is specified, the channel is removed automatically after the expiration date. When no expiration date is specified, the channel information always persists and the EventPublisher continues to publish all valid events to this channel.
Note: The expiration date of an event channel is effective only when the EventPublisher is started or refreshed. It is also effective when any event channel is added, modified, or deleted.