Duplicate Messages

There is a client that can be sender (producer) or receiver(consumer). The sender is in the same machine that the JBossAS, and the receiver in another LAN machine.
Both of them connect to the queue 'queue/testQueue', one produces, one consumes.

However, when capturing the messages with a sniffer (eg. ethereal).
We've seen that when the server sends an object message to the client the client (in this case the receiver) resends back the same message to the server.
The JMS options are:

• TTL = 0
• NON_PERSISTENT (using messageCache)
• MaxRedelivery = 10
• priority = 4.

We know for sure it's not a network problem, but an application one. It has been tested on different JBoss configurations (all / default) and versions (3.2.3 / 4.0.1 SP1).

I here add the frames capture made with ethereal (the sender's ip is 192.168.7.121, the receiver's ip is 192.168.7.192, jboss jms server running on 192.168.7.121:8093)

source 192.168.7.121 dest 192.168.7.192 8093 > 40662

0000 00 08 a1 55 cb e3 00 10 4b 8a 87 9e 08 00 45 00 ...U.... K.....E.
0010 00 9f 2e 55 40 00 80 06 3b 7a c0 a8 07 79 c0 a8 ...U@... ;z...y..
0020 07 c0 1f 9d 9e d6 87 16 42 a4 05 f7 66 5b 80 18 ........ B...f[..
0030 fa 29 5a e5 00 00 01 01 08 0a 00 35 db 44 03 66 .)Z..... ...5.D.f
0040 96 c9 77 68 19 80 00 00 21 00 00 00 00 01 02 02 ..wh.... !.......
0050 00 09 74 65 73 74 51 75 65 75 65 00 00 00 02 00 ..testQu eue.....
0060 00 00 00 00 00 00 00 00 00 00 04 07 00 13 49 44 ........ ......ID
0070 3a 33 2d 31 31 30 39 39 35 35 32 35 37 31 38 36 :3-11099 55257186
0080 33 00 00 01 02 6e 7d 23 62 01 09 ff ff ff ff 00 3....n}# b.......
0090 09 00 00 01 07 00 04 49 44 3a 33 00 00 00 00 00 .......I D:3.....
00a0 00 00 04 48 6f 6c 61 01 80 00 00 00 79 ...Hola. ....y

source 192.168.7.192 dest 192.168.7.121 40662 > 8093

0000 00 10 4b 8a 87 9e 00 08 a1 55 cb e3 08 00 45 00 ..K..... .U....E.
0010 00 9f b4 0c 40 00 40 06 f5 c2 c0 a8 07 c0 c0 a8 ....@.@. ........
0020 07 79 9e d6 1f 9d 05 f7 66 5b 87 16 43 0f 80 18 .y...... f[..C...
0030 16 d0 3c de 00 00 01 01 08 0a 03 66 97 bf 00 35 ..<..... ...f...5
0040 db 44 77 68 19 80 00 00 21 00 00 00 00 01 02 02 .Dwh.... !.......
0050 00 09 74 65 73 74 51 75 65 75 65 00 00 00 02 00 ..testQu eue.....
0060 00 00 00 00 00 00 00 00 00 00 04 07 00 13 49 44 ........ ......ID
0070 3a 33 2d 31 31 30 39 39 35 35 32 35 37 31 38 36 :3-11099 55257186
0080 33 00 00 01 02 6e 7d 23 62 01 09 ff ff ff ff 00 3....n}# b.......
0090 09 00 00 01 07 00 04 49 44 3a 33 00 00 00 00 00 .......I D:3.....
00a0 00 00 04 48 6f 6c 61 01 80 00 00 00 79 ...Hola. ....y
source 192.168.7.192 dest 192.168.7.121 40662 > 8093

0000 00 10 4b 8a 87 9e 00 08 a1 55 cb e3 08 00 45 00 ..K..... .U....E.
0010 00 64 b4 0d 40 00 40 06 f5 fc c0 a8 07 c0 c0 a8 .d..@.@. ........
0020 07 79 9e d6 1f 9d 05 f7 66 c6 87 16 43 0f 80 18 .y...... f...C...
0030 16 d0 b9 12 00 00 01 01 08 0a 03 66 97 bf 00 35 ........ ...f...5
0040 db 44 77 2d 01 00 00 00 3b 00 01 01 02 00 09 74 .Dw-.... ;......t
0050 65 73 74 51 75 65 75 65 00 13 49 44 3a 33 2d 31 estQueue ..ID:3-1
0060 31 30 39 39 35 35 32 35 37 31 38 36 33 80 00 00 10995525 71863...
0070 00 79 .y

source 192.168.7.192 dest 192.168.7.121 40662 > 8093

0000 00 10 4b 8a 87 9e 00 08 a1 55 cb e3 08 00 45 00 ..K..... .U....E.
0010 00 4a b4 0e 40 00 40 06 f6 15 c0 a8 07 c0 c0 a8 .J..@.@. ........
0020 07 79 9e d6 1f 9d 05 f7 66 f6 87 16 43 19 80 18 .y...... f...C...
0030 16 d0 22 88 00 00 01 01 08 0a 03 66 97 bf 00 35 .."..... ...f...5
0040 db 44 77 13 0d 00 00 00 3c 00 80 00 00 00 00 00 .Dw..... <.......
0050 00 00 00 00 00 00 00 79 .......y