Lost message from server's point of view

Hi All
Following situation:
The JMS-Provider sends a JMS-Message. The message is entirely in the wire and is still flying to the consumer. Before the message arrives to the consumer, the network connection fails, so the client does nothing know about the send message.
From the server’s point of view the message was successfully sent but not acknowledged yet. The server waits for an acknowledge and doesn’t undertake redelivery, because the consumer session on the server is still living.
From the consumer point of view the message was not sent so the client has nothing to ack, so we have some “deadlock”.
The question is – how does server recognize such situation (short connection fail, deadlock) and what does it undertake to guarantee the delivery?
Thank you.

The JMS-Provider sends a JMS-Message. The message is entirely in the wire and is still flying to the consumer. Before the message arrives to the consumer, the network connection fails, so the client does nothing know about the send message.
From the server’s point of view the message was successfully sent but not acknowledged yet. The server waits for an acknowledge and doesn’t undertake redelivery, because the consumer session on the server is still living.
From the consumer point of view the message was not sent so the client has nothing to ack, so we have some “deadlock”.
The question is – how does server recognize such situation (short connection fail, deadlock) and what does it undertake to guarantee the delivery?If the "network connection fails" whilst sending a message then the server (and probably the client) will almost certainly receive a SocketException. A message is unlikely to simply disappear on the wire without at least one end of the socket getting an exception of some kind, and if the socket is simply hanging for some reason then most JMS providers would have a means to detect this (e.g. by sending periodic packets down the wire to check it is still alive).
But ultimately, if a persistent message is sent to a consuming client and the message is not acknowledged (or the transaction committed) then the server will eventually redeliver it. JMS doesn't define exactly when an unacknowledged message is redelivered, but it typically wouldn't happen until the consumer in question has closed.
Nigel

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