Explanation/Reference:
A: The JMSRedelivered property specifies a flag set when a message is redelivered because no acknowledge was received. This flag is of interest to a receiving application.
If set, the flag indicates that JMS may have delivered the message previously because one of the following is true:
* The application has already received the message, but did not acknowledge it.
* The session's recover() method was called to restart the session beginning after the last acknowledged message.
Reference: http://docs.oracle.com/cd/E12840_01/wls/docs103/jms/fund.html