JMS Specification Question regarding persistent messages and reliability.

In section 6.15 of the JMS Specification, titled reliability it is stated that:
"When all messages for a topic must be received, a durable subscriber should be used. JMS insures that messages published while a durable subscriber is inactive are retained by JMS and delivered when the subscriber subsequently becomes active.
Nondurable subscribers should be used only when missed messages are tolerable."
Then in a table following the above text it states that a nondurable subscriber on a topic flowing persistent messages will receive a message "once-and-only-once (missed if inactive)."
To me this implies that if a nondurable subscriber is active, it is guaranteed to receive all persistent messages published to the topic while it is active. However there seems to be some ambiguity about what it means to be "active." Does active mean subscribed, does it mean subscribed and not busy processing messages, something else?
I ask this because I'm seeing a somewhat slow subscriber not receiving all persistent messages published while it is subscribed. This was surprising to me, given my interpretation of this reliability clause, so I'm wondering if I have not interpreted it correctly in this case.
Could anyone fill me in, particularly if you had something to do with writing the spec or can point me to the rationale behind this portion of the spec?
Thanks,
Jeff Singer

I am looking at the JMS 1.1 Spec version 1.1 April 12, 2002.
Section 4.10 "Reliabilty" has what reads to me as kind of a CYA statement that the contributing JMS providers got inserted. It reads:
"A JMS provider may have resource restrictions that limit the number of messages that can be held for high-volume destinations or non-responsive clients. If messages are dropped due to resource limits, this is usually a serious administrative issue that needs attention. Correct functioning of JMS requires that clients are responsive and that adequate resources to service them are available.
+
+
+Once-and-only-once message delivery, as described in this specification, has the important caveat that it does not cover message destruction due to message expiration or other administrative destruction criteria. It also does not cover loss due to resource restrictions. Configuration of adequate resources and processing power for JMS applications is the job of administrators, who must be aware of their JMS provider's reliability features."
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Edited by: blavoie on Oct 31, 2010 6:18 PM
Edited by: blavoie on Oct 31, 2010 6:20 PM

Hi,
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Automatic archival             Enabled
Archive destination            USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence     4
Next log sequence to archive   6
Current log sequence           6
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NAME                                 TYPE        VALUE
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log_archive_dest_11                  string
log_archive_dest_12                  string
log_archive_dest_13                  string
log_archive_dest_14                  string
log_archive_dest_15                  string
log_archive_dest_16                  string
log_archive_dest_17                  string
log_archive_dest_18                  string
log_archive_dest_19                  string
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You're grammer isn't bad jord, it was I who asked a plethora of questions under one Subject heading.
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/Volumes/320GB HD/Users/ahuihou/.Trash/2 Track 02.aiff
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