Hi Prema,
Simply call "listen()" on the TransportMapping to start it again.
Best regards,
Frank
Am 10.07.2014 22:00, schrieb Prema Upot:
Hi Frank,
I was going to SNMP4J logs and I noticed that ListenThread of
DefaultUdpTransportMapping stopped because socket closed for some reason.
014-07-09 09:52:28,303 ERROR [ ransportMapping_172.21.0.169/0 ] Socket for
transport mapping
org.snmp4j.transport.DefaultUdpTransportMapping$ListenThread@17add1b error:
socket closed
java.net.SocketException: socket closed
at java.net.PlainDatagramSocketImpl.receive0(Native Method)
at java.net.PlainDatagramSocketImpl.receive(Unknown Source)
at java.net.DatagramSocket.receive(Unknown Source)
at
org.snmp4j.transport.DefaultUdpTransportMapping$ListenThread.run(DefaultUdpTransportMapping.java:339)
at java.lang.Thread.run(Unknown Source)
2014-07-09 09:52:28,303 DEBUG [ ransportMapping_172.21.0.169/0 ] Worker task
stopped:org.snmp4j.transport.DefaultUdpTransportMapping$ListenThread
From this point onwards, I see that every request has socket closed error.
We have modelled our main SNMP interface based on the SNMPRequest.java class
included with SNMP4j and we are creating a new instance of this class every
time. But there is only one instance of SNMP class that is statically created
within this SnmpRequest. This was done based on your suggestion ( that was way
back in 2012 : ) to fix snmp timeout problem (snmp response received from
network but snmp4j stack reported timeout). Hence in the end we have only one
instance of DefaultUdpTransportMapping and with the ListenThread closed, we
will always be in error mode until we restart the server.
Is there anything we can do to recreate the ListenThread? I have no clue why
the socket closed in the first instance. We have been running this code for a
few years now and this problem has surfaced only quite recently.
Thanks,
Prema
-----Original Message-----
From: SNMP4J [mailto:snmp4j-boun...@agentpp.org] On Behalf Of Frank Fock
Sent: Wednesday, July 09, 2014 2:22 PM
To: snmp4j@agentpp.org
Subject: Re: [SNMP4J] Socket closed exception
Hi Prema,
Most likely, someone is calling Snmp.close() or the close() method of the
underlying transport mapping while other code is still using the same Snmp
session.
Another option would be the operating system or JRE closing the socket itself
for some reason (unlikely).
Best regards,
Frank
Am 09.07.2014 20:12, schrieb Prema Upot:
Hi,
We use SNMP4j 1.11 version. Recently we have been seeing a lot of socket closed
exceptions while sending SNMP get/set messages. We have been using this version
of SNMP4J for a long time in our application (and we have not modified the way
we use the SNMP4J API at all) and we have never seen this before. This happens
when we try to send a set of SNMP requests within a short period of time to
different hosts (like periodic SNMP polling of a group of devices). Any ideas
why this is happening ? Once this happens the only way to recover from this
state is to restart my application.
This is a sample exception that I see in my log file.
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
java.net.SocketException: Socket is closed
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at java.net.DatagramSocket.send(Unknown Source)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at
org.snmp4j.transport.DefaultUdpTransportMapping.sendMessage(DefaultUdpTransportMapping.java:115)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at
org.snmp4j.MessageDispatcherImpl.sendMessage(MessageDispatcherImpl.java:195)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at org.snmp4j.MessageDispatcherImpl.sendPdu(MessageDispatcherImpl.java:462)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at org.snmp4j.Snmp.sendMessage(Snmp.java:1078)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at org.snmp4j.Snmp.send(Snmp.java:891)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at org.snmp4j.Snmp.send(Snmp.java:871)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at org.snmp4j.Snmp.send(Snmp.java:836)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at com.optelian.common.SnmpRequest.send(SnmpRequest.java:396)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at com.optelian.common.SnmpRequest.send(SnmpRequest.java:370)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at
com.optelian.common.OMSSnmp4JDeviceInterface.readFields(OMSSnmp4JDeviceInterface.java:353)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at com.optelian.common.OMSDeviceManager.readFields(OMSDeviceManager.java:74)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at
com.optelian.topology.server.util.ShelfInterface.readProperties(ShelfInterface.java:220)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at
com.optelian.topology.server.util.ShelfInterface.readReleaseString(ShelfInterface.java:170)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at
com.optelian.topology.server.discovery.ShelfPolling.pollOMSNode(ShelfPolling.java:181)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at
com.optelian.topology.server.discovery.ShelfPolling.run(ShelfPolling.java:63)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[09 Jul 2014 13:44:20:653] [ polling-11 ] SYS_ERR:
at java.lang.Thread.run(Unknown Source)
Any help in debugging this problem is much appreciated.
Thanks,
Prema
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Fax: +49 7024 8688231
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