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https://issues.apache.org/jira/browse/AMQ-3872 - Implement "exactly once" delivery with JDBC and XA in the event of a failure post prepare. jdbc xa is not a runner due to single table and update locks. implemention adds xid column to messages and acks table. a non null value indicated a prepared add/ack, so the insert is done on prepare. the result of the transaction outcome requires a row level update
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activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/ConnectionContext.java