[SNMP4J] IOException in DefaultUDPTransportMapping

[shenaz.assu at wipro.com]

Hi Frank,

Thanks a ton for such a quick reply. So you mean its game over? :(

Do you have any suggestions how I should handle this situation? The
client does not want me to show SnmpTimeOut. Because when he checks from
the Adventnet MibBrowser, he can see the value. Although it is an SNMP
agent issue, I have been asked to handle it my application. 

Regards
Shenaz

-----Original Message-----
From: Frank Fock [mailto:fock at agentpp.com] 
Sent: Friday, December 19, 2008 9:59 PM
To: Shenaz Mohamed assu (WT01 - Telecom Equipment)
Cc: snmp4j at agentpp.org
Subject: Re: [SNMP4J] IOException in DefaultUDPTransportMapping

Hi Shenaz,

You cannot report that error back, because when you cannot decode the
response (because of an BER encoding error), you cannot match the
response with the request. Game over ;-)

Regards,
Frank

shenaz.assu at wipro.com wrote:
> Hi All,
>  
> I'm facing an issue with SNMP GET. While sending the PDU to the SNMP
agent with public ResponseEvent send(PDU pdu, Target target,
TransportMapping transport) throws IOException method, i'm getting the
following exception. 
>  
> java.io.IOException: Length greater than 32bit are not supported  for 
> integers:  at position 49 at 
> org.snmp4j.asn1.BER.decodeInteger(BER.java:627)
>  at org.snmp4j.smi.Integer32.decodeBER(Integer32.java:62)
>  at org.snmp4j.smi.Variable.createFromBER(Variable.java:170)
>  at org.snmp4j.smi.VariableBinding.decodeBER(VariableBinding.java:164)
>  at org.snmp4j.PDUv1.decodeBER(PDUv1.java:169)
>  at org.snmp4j.mp.MPv1.prepareDataElements(MPv1.java:170)
>  at 
> org.snmp4j.MessageDispatcherImpl.dispatchMessage(MessageDispatcherImpl
> .java:241)  at 
> org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.
> java:313)  at 
> org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.
> java:276)  at 
> org.snmp4j.transport.AbstractTransportMapping.fireProcessMessage(Abstr
> actTransportMapping.java:81)  at 
> org.snmp4j.transport.DefaultUdpTransportMapping$ListenThread.run(Defau
> ltUdpTransportMapping.java:282)
>  
> From this what I've understood is that, the SNMP agent is returning a
value larger than integer for the attribute that is expected to return
an integer value. This IOException is caught and logged in
DefaultUdpTransportMapping. So in my application I'll get ResponseEvent
with a null PDU and i'll throw an SnmpTimeOutError as the response is
null.
>  
> The problem is that I do not want to show the error as an SnmpTimeOut.

> I want to show the exact reason in my application. So I tried 
> modifying the code and I threw a RunTimeException from the 
> MessageDispatcherImpl after catching the IOException. Then I got the 
> below log
>  
> Exception in thread "DefaultUDPTransportMapping_192.168.234.72/0" 
> java.lang.RuntimeException: Length greater than 32bit are not 
> supported  for integers:  at position 49  at 
> org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.
> java:324)  at 
> org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.
> java:276)  at 
> org.snmp4j.transport.AbstractTransportMapping.fireProcessMessage(Abstr
> actTransportMapping.java:81)  at 
> org.snmp4j.transport.DefaultUdpTransportMapping$ListenThread.run(Defau
> ltUdpTransportMapping.java:282)
>  
> My requirement is that if i get an IOException like above I want to
throw that exception and catch it in my code so that i can give a
clearer message. Is it possible to do that? Can anyone of you help me
out with this? Its really urgent.
>  
> Thanks a lot!!
>  
> Best regards
> Shenaz
>  
> 
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