Message loss during network connection reset

Question

We are planning on using Oracle streams for async notifications between the database and our Java application. While testing for some edge cases we are running into the following issue.
1) Start Java code(Waiting to dequeue message) -> disconnect network -> queue new message(using SQL) -> connect network ==> We are loosing the message in this scenario, even if we restart the listener the message would not show up.
2) Start Java code(Waiting to dequeue message) -> disconnect network -> connect network -> queue new message(using SQL) ==> This scenario works.
DB stores messages if the listener is not running, but if we start the listener and disconnect network connection somehow the database thinks it delivered the message.
Also is there any way to stop blocking dequeue call during connection drop, database shutdown/restart?
We are using the point-to-point model, messaged is enqueued from a trigger that gets fired on insert/update to a particular table and we have a MessageListener that Uses Java API to dequeue the message. This code works fine during normal operation.

Answer 1

AQ uses persistent storage in queue tables so the first thing to do is see if the messages got into the table.
If they did what is the status? If not the issue is likely that your code never got the messages to the database.