[SNMP4J] what does protocol family unavailable exception mean

[Frank Fock]

Hi Syed,

The exception might be thrown because of mixing IPv4 and IPv6 on the same
TransportMapping which is not supported by some operating systems.

In SNMP4J 2.2.6 the root cause will be included in the MessageException. 
In SNMP4J 1.x
you may enable the debugging log level to get the original stack trace 
printed to the
console.

Best regards,
Frank


Am 25.02.2014 18:23, schrieb Ali, Syed F:
> Hi,
>
> I'm using snmp4j 1.11.1 in our application and occasionally, we're seeing this exception encountered when trying to send an SNMP get request:
> org.snmp4j.MessageException: Protocol family unavailable
>                  at org.snmp4j.MessageDispatcherImpl.sendPdu(MessageDispatcherImpl.java:485)[195:org.snmp4j:1.11.1]
>                  at org.snmp4j.util.MultiThreadedMessageDispatcher.sendPdu(MultiThreadedMessageDispatcher.java:146)[195:org.snmp4j:1.11.1]
>                  at org.snmp4j.Snmp.sendMessage(Snmp.java:1082)[195:org.snmp4j:1.11.1]
>                  at org.snmp4j.Snmp.send(Snmp.java:971)[195:org.snmp4j:1.11.1]
>                  at org.snmp4j.Snmp.send(Snmp.java:955)[195:org.snmp4j:1.11.1]
> ...
> ... (stack truncated)
>
> I looked at the snmp4j code for 1.11.1 and it basically catches an IOException and wraps only the message from the exception into the "MessageException" as below:
> Line 485:      throw new MessageException(iox.getMessage());
>
>
> 1)      Any idea what would cause the IOException to be thrown?
>
>
> 2)      If the code set the IOException as the cause of the MessageException, we could unwind the whole exception cause chain, and find out the root cause of the IOException, like:
> throw new MessageException( iox );
>
> Thanks,
> Syed
>
> Syed F. Ali
> CA Technologies
>
>
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