[SNMP4J] Strange exception

[Sasa Markovic]

The patch solved the problem - now it runs smoothly!

Sasa.

Frank Fock wrote:
> Hi Sasa,
> 
> I assume that you are using SNMP4J in a multi-threaded environment.
> Then the following patch for org.snmp4j.smi.Variable could solve your
> problem:
> 
>  private synchronized static void registerSyntaxes() {
>    InputStream is = 
> Variable.class.getResourceAsStream(SMISYNTAXES_PROPERTIES);
>    if (is == null)
>      throw new InternalError("Could not read '"+SMISYNTAXES_PROPERTIES+
>                              "' from classpath!");
>    Properties props = new Properties();
>    try {
>      props.load(is);
>      Hashtable regSyntaxes = new Hashtable(props.size());
>      for (Enumeration en = props.propertyNames(); en.hasMoreElements();) {
>        String id = (String)en.nextElement();
>        String className = props.getProperty(id);
>        try {
>          Class c = Class.forName(className);
>          regSyntaxes.put(new Integer(id), c);
>        }
>        catch (ClassNotFoundException cnfe) {
>          logger.fatal(cnfe);
>        }
>      }
>      // atomic syntax registration
>      registeredSyntaxes = regSyntaxes;
>    }
>    catch (IOException iox) {
>      String txt = "Could not read '"+SMISYNTAXES_PROPERTIES+"': "+
>                   iox.getMessage();
>      logger.fatal(txt);
>      throw new InternalError(txt);
>    }
>  }
> 
> 
> An updated SNMP4J release (v1.0.3a) will be available soon from
> SNMP4J.org.
> 
> Best regards,
> Frank
> 
> Sasa Markovic wrote:
> 
>> Hi,
>>
>> I have recently discovered SNMP4J and I want to say that this library 
>> is much better than any other free SNMP library. I have managed to 
>> port my existing java code to SNMP4J very quickly, but from time to 
>> time I get the following strange exception:
>>
>> ==========================================================
>>
>> java.io.IOException: Encountered unsupported variable syntax: 67
>>         at org.snmp4j.smi.Variable.createFromBER(Variable.java:120)
>>         at 
>> org.snmp4j.smi.VariableBinding.decodeBER(VariableBinding.java:143)
>>         at org.snmp4j.PDUv1.decodeBER(PDUv1.java:169)
>>         at org.snmp4j.mp.MPv1.prepareDataElements(MPv1.java:170)
>>         at 
>> org.snmp4j.MessageDispatcherImpl.dispatchMessage(MessageDispatcherImpl.java:204) 
>>
>>         at 
>> org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.java:263) 
>>
>>         at 
>> org.snmp4j.transport.DefaultUdpTransportMapping$ListenThread.run(DefaultUdpTransportMapping.java:172) 
>>
>> java.io.IOException: Encountered unsupported variable syntax: 67
>>         at org.snmp4j.smi.Variable.createFromBER(Variable.java:120)
>>         at 
>> org.snmp4j.smi.VariableBinding.decodeBER(VariableBinding.java:143)
>>         at org.snmp4j.PDUv1.decodeBER(PDUv1.java:169)
>>         at org.snmp4j.mp.MPv1.prepareDataElements(MPv1.java:170)
>>         at 
>> org.snmp4j.MessageDispatcherImpl.dispatchMessage(MessageDispatcherImpl.java:204) 
>>
>>         at 
>> org.snmp4j.MessageDispatcherImpl.processMessage(MessageDispatcherImpl.java:263) 
>>
>>         at 
>> org.snmp4j.transport.DefaultUdpTransportMapping$ListenThread.run(DefaultUdpTransportMapping.java:172) 
>>
>>
>> ============================================
>>
>> I am using PDUv1 to sample some standard OIDs (ifInOctets, ifOutOctets 
>> and similar) - nothing more complicated than that. To make things more 
>> strange, this exception gets printed on the screen only from time to 
>> time - it does not appear on every SNMP request targeting the same OID 
>> on the same host. However, my application seems to be working properly 
>> but this exception is quite annoying.
>>
>> Thanx for the help.
>>
>> Best regards,
>> Sasa Markovic
>> _______________________________________________
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>> SNMP4J at agentpp.org
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>>
> 
>