[SNMP4J] Registering multiple managed objects and org.snmp4j.agent.DuplicateRegistrationException error

[Frank Fock]

Hi,

First, OIDs start with a number, not a dot.
Second, you need to register your own OID root. You must not define
any OIDs in subtrees of other vendors or standard MIB modules.
In your case, your OIDs clash with other OIDs in the agent ->
that's why a DuplicateRegistrationException is being thrown.

Best regards,
Frank

Am 30.03.2013 14:35, schrieb Marek Hajduczenia:
> Dear colleagues,
>
>   
>
> I am continuing the development of my project and now I have a rather simple
> task that keeps on generating errors for some reason I do not quite
> understand. But let me first describe what I am doing and what the output
> is:
>
>   
>
> [1] I create 4 individual OID to be used later on
>
>   
>
> OID oidLocalHostName = new OID(".1.3.6.1.3.22.1.1"); // nomeServidor
>
> OID oidRootFolder = new OID(".1.3.6.1.3.22.1.2"); // diretoriaBase
>
> OID oidDefaultPlayer = new OID(".1.3.6.1.3.22.1.3"); // musicPlayer
>
> OID oidNumberOfMusicFiles = new OID(".1.3.6.1.3.22.1.4"); //
> nTotalmMsicasDisp
>
>   
>
> [2] then I try to register individual new managed objects as follows
>
>   
>
> server.registerManagedObject(MOCreator.createReadOnly(oidLocalHostName,
> java.net.InetAddress.getLocalHost().getHostName()));
>
> server.registerManagedObject(MOCreator.createReadOnly(oidDefaultPlayer,
> "VLC")); // HERE IS THE LINE WITH ERROR
>
> server.registerManagedObject(MOCreator.createReadOnly(oidRootFolder,
> folder.getAbsolutePath()));
>
> server.registerManagedObject(MOCreator.createReadOnly(oidNumberOfMusicFiles,
> 0));
>
>   
>
> the function registerManagedObject is just a simple wrapper defined as
> follows:
>
>   
>
>         public void registerManagedObject(ManagedObject mo)
>
>         {
>
>                try
>
>                {
>
>                       server.register(mo, null);
>
>                }
>
>                catch (DuplicateRegistrationException ex)
>
>                {
>
>                       throw new RuntimeException(ex);
>
>                }
>
>         }
>
>   
>
> I get however the following error on console:
>
>   
>
> 208 [main] INFO org.snmp4j.agent.DefaultMOServer  - Registered MO
> org.snmp4j.agent.mo.MOScalar[oid=1.3.6.1.3.22.1.1,access=org.snmp4j.agent.mo
> .MOAccessImpl at 3ce3e8f3,value=Marek-HP,volatile=false] in default context
> with scope
> org.snmp4j.agent.mo.MOScalar[oid=1.3.6.1.3.22.1.1,access=org.snmp4j.agent.mo
> .MOAccessImpl at 3ce3e8f3,value=Marek-HP,volatile=false]
>
> Exception in thread "main" java.lang.RuntimeException:
> org.snmp4j.agent.DuplicateRegistrationException:
> org.snmp4j.agent.DefaultMOContextScope[context=null,lowerBound=1.3.6.1.3.22.
> 1,lowerIncluded=true,upperBound=1.3.6.1.3.22.2,upperIncluded=false]
>
>         at
> org.snmpagent.snmpAgentServer.registerManagedObject(snmpAgentServer.java:177
> )
>
>         at
> org.snmpagent.snmpAgentClientMain.main(snmpAgentClientMain.java:160)
>
> Caused by: org.snmp4j.agent.DuplicateRegistrationException:
> org.snmp4j.agent.DefaultMOContextScope[context=null,lowerBound=1.3.6.1.3.22.
> 1,lowerIncluded=true,upperBound=1.3.6.1.3.22.2,upperIncluded=false]
>
>         at
> org.snmp4j.agent.DefaultMOServer.register(DefaultMOServer.java:279)
>
>         at
> org.snmpagent.snmpAgentServer.registerManagedObject(snmpAgentServer.java:173
> )
>
>         ... 1 more
>
>   
>
> With the information that the content was registered at OID of
> 1.3.6.1.3.22.1.1 (oidLocalHostName) with the default context (null). The
> attempt to perform registration for OID of 1.3.6.1.3.22.2 causes the
> org.snmp4j.agent.DuplicateRegistrationException for some reason. I looked
> through the documentation associated with this error, but cannot still
> locate what the problem is. Any hints?
>
>   
>
> Also, is there a better / cleaner way to create a number of OIDs with
> specific values? I looked through the examples in the SampleAgent class, but
> there is no clear example of how that could be done.
>
>   
>
> Thanks for any help
>
>   
>
> Marek
>
> _______________________________________________
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> SNMP4J at agentpp.org
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