Frank,
I found that someone that configured the system to try to use the wrong port
(555555), but when I solved this error the timeout problem and the
ConcurrentModificationException stopped to ocurr. Is it an incorrect
exception handling of IllegalArgumentException inside the
DefaultUdpTransportMapping? Because an isolated error affect all SNMP
processing of snmp4j in VM.
Renato A. Ferreira
----- Original Message -----
From: "Frank Fock" <[EMAIL PROTECTED]>
To: "Renato Araújo Ferreira" <[EMAIL PROTECTED]>
Cc: <[email protected]>
Sent: Wednesday, August 27, 2008 6:58 PM
Subject: Re: [SNMP4J] some SNMP4j issues...
Hello Renato,
Are you sure that each session is closed only once?
The last error you reported (ConcurrentMofificationException)
suggests that.
The other errors/delays are caused by Java and
probably caused by heavy session (=UDP port)
creation and closing.
Changing the JRE (version) may help too.
Best regards,
Frank
Renato Araújo Ferreira wrote:
Hello all,
I´m trying to use snmp4j in my application. It worked fine for single
threaded application, but I found some problems in a multithreaded
environment.
Each thread has your own session initialized with:
TransportMapping transporteUDP = new DefaultUdpTransportMapping();
this.sessaoSNMP = new Snmp(transporteUDP);
this.sessaoSNMP.listen();
And closed with:
this.sessaoSNMP.close();
These sessions are reused in all thread's life cycle only changing their
CommunityTarget and UserTarget. But, at end of process, one last target
(randomly, not the same) always wait too many time, between 250 and 300
seconds, in method org.snmp4j.Snmp.get with this stack:
"DefaultUDPTransportMapping_1.1.0.160/0" daemon prio=1 tid=0x086b8070
nid=0x7c51 runnable [0x8b948000..0x8b948ec0]
at java.net.PlainDatagramSocketImpl.receive0(Native Method)
at
java.net.PlainDatagramSocketImpl.receive(PlainDatagramSocketImpl.java:136)
- locked <0x926b9918> (a java.net.PlainDatagramSocketImpl)
at java.net.DatagramSocket.receive(DatagramSocket.java:712)
- locked <0xb1b6d400> (a java.net.DatagramPacket)
- locked <0x926bacd0> (a java.net.DatagramSocket)
at
org.snmp4j.transport.DefaultUdpTransportMapping$ListenThread.run(Unknown
Source)
at java.lang.Thread.run(Thread.java:595)
at
org.snmp4j.util.DefaultThreadFactory$WorkerThread.run(Unknown Source)
"Coletando: [EMAIL PROTECTED]" daemon prio=1 tid=0x086244d8
nid=0x7c38 in Object.wait() [0x8c76a000..0x8c76ae40]
at java.lang.Object.wait(Native Method)
- waiting on <0x92ae9730> (a
org.snmp4j.Snmp$SyncResponseListener)
at java.lang.Object.wait(Object.java:474)
at org.snmp4j.Snmp.send(Unknown Source)
- locked <0x92ae9730> (a org.snmp4j.Snmp$SyncResponseListener)
at org.snmp4j.Snmp.send(Unknown Source)
at org.snmp4j.Snmp.get(Unknown Source)
...
Sometimes I'm getting a "IllegalArgumentException: port out of
range:555555" error with this stack:
java.lang.IllegalArgumentException: port out of range:555555
at
java.net.InetSocketAddress.<init>(InetSocketAddress.java:83)
at
org.snmp4j.transport.DefaultUdpTransportMapping.sendMessage(Unknown
Source)
at org.snmp4j.MessageDispatcherImpl.sendMessage(Unknown
Source)
at org.snmp4j.MessageDispatcherImpl.sendPdu(Unknown Source)
at org.snmp4j.Snmp.sendMessage(Unknown Source)
at org.snmp4j.Snmp$PendingRequest.run(Unknown Source)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
And, finally, sometimes I'm getting a "ConcurrentModificationException"
error using a iterator (method Iterator.next()) at end of process, when
all the SNMP communications are already finished. This code was already
there before I'm using SNMP4j and, as I found some information about bugs
like this in the web, I think so that could be something with my
implementation of SNMP4j.
OMG, a large email, but could someone help me??
Thankss....
Renato A. Ferreira
_______________________________________________
SNMP4J mailing list
[email protected]
http://lists.agentpp.org/mailman/listinfo/snmp4j
--
AGENT++
http://www.agentpp.com
http://www.mibexplorer.com
http://www.mibdesigner.com
_______________________________________________
SNMP4J mailing list
[email protected]
http://lists.agentpp.org/mailman/listinfo/snmp4j
