A: 

According to Java Message Service, Second Edition

The acknowledge() method should only be used with the CLIENT_ACKNOWLEDGE mode; if used with the AUTO_ACKNOWL EDGE or DUPS_OK_ACKNOWLEDGE mode, the call is ignored by the JMS provider.

Sujee  2010-08-16 16:42:16
is this call ignored by client lib or by server?
zhilyaev  2010-08-17 08:55:32
@zhilyaev Sorry. I am not sure. Because usually JMS provider means client lib + server.
Sujee  2010-08-17 10:24:21

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