Hi Pierre,
This NPE can only happen if the request was already canceled.
Simply check if the request is != null and only then do the cancel.
PDU request = event.getRequest();
if (request != null) {
((Snmp)event.getSource()).cancel(request, this);
}
FYI, timed requests are cancelled automatically.
Best regards,
Frank
Am 21.10.2013 17:45, schrieb pierre.r...@orange.com:
Hi Franck,
I'll have to look into that. It seems to me that the request pdu might also be
null but I might be wrong.
I've based my code on the sample in snmp javadoc :
ResponseListener listener = new ResponseListener() {
public void onResponse(ResponseEvent event) {
// Always cancel async request when response has been received
// otherwise a memory leak is created! Not canceling a request
// immediately can be useful when sending a request to a broadcast
// address.
((Snmp)event.getSource()).cancel(event.getRequest(), this);
System.out.println("Received response PDU is:
"+event.getResponse());
}
};
When running this, I get a null pointer (when the underlying code call
gethashcode()) because event.getRequest() returns null.
regards,
Pierre Rust
________________________________________
De : Frank Fock [f...@agentpp.com]
Date d'envoi : lundi 21 octobre 2013 16:05
À : RUST Pierre IMT/OLPS; snmp4j@agentpp.org
Objet : Re: RE : [SNMP4J] NPE in pduHandleAssigned
Hi Pierre,
Synchronous requests do not have to be canceled.
Asynchronous requests have to be canceled with the *request* PDU.
Thus, it is not relevant if the response PDU is null or not. Simply use
the request PDU.
Best regards,
Frank
Am 21.10.2013 11:23, schrieb pierre.r...@orange.com:
Hi,
I have another question about this issue.
When cancelling a request (either when closing or on an asynchronous request,
at the end of onResponse(ResponseEvent event) ) the PDU might be null if the
request timed out.
I've read in the javadoc of Snmp that an asynchronous request must always be
cancelled otherwise a memory leak is created. How can you cancel the request
when the pdu is null ? Or maybe you don't need to cancel it if the pdu is null ?
thanks,
Pierre Rust
________________________________________
De : snmp4j-boun...@agentpp.org [snmp4j-boun...@agentpp.org] de la part de
Frank Fock [f...@agentpp.com]
Date d'envoi : vendredi 11 octobre 2013 12:49
À : snmp4j@agentpp.org
Objet : Re: [SNMP4J] NPE in pduHandleAssigned
Hi Pierre,
You can avoid this exception if you cancel all pending requests before
you close
the Snmp session.
I agree, that the Snmp.close() should do this for you. I will provide a fix
for it in version 2.2.3.
Best regards,
Frank
Am 11.10.2013 10:45, schrieb pierre.r...@orange.com:
Hi,
I'm using SNMP4J and I'm sometime getting an NPE in pduHandleAssigned :
java.lang.NullPointerException
at org.snmp4j.Snmp$PendingRequest.pduHandleAssigned(Snmp.java:1624)
at org.snmp4j.Snmp$PendingRequest.pduHandleAssigned(Snmp.java:1485)
at org.snmp4j.MessageDispatcherImpl.sendPdu(MessageDispatcherImpl.java:495)
at org.snmp4j.Snmp.sendMessage(Snmp.java:1005)
at org.snmp4j.Snmp$PendingRequest.run(Snmp.java:1666)
at java.util.Timer$TimerImpl.run(Timer.java:284)
Given that the line 1624 is : "timer.schedule(this, delay);" , I assume the
timer is null.
It might be that this happens when closing SNMP4J with an ongoing PendingRequest (in
close(), line 509, timer is set to null) but I'm unfortunately not able to confirm this
assumption : the problem only happens "on the field" and I never reproduce it
in debug.
In can upgrade to 2.2.2, but I don't see any relevant difference in the
(potentially offending) code.
Do you have any idea of what I could do investigate this issue ?
thanks a lot for the good work,
Pierre Rust
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