https://jira.opendaylight.org This file is an XML representation of an issue en-us 8.20.10 820010 22-06-2022 https://jira.opendaylight.org/browse/SNMP4SDN-12 snmp4sdn <p>Three switches are used in my experiment, and the connection between them is as follows:</p> <p>s1(GE1/0/1)-----<del>(GE1/0/1)s2(GE1/0/2)</del>-----(GE1/0/1)s3</p> <p>Firstly, I use command snmp4sdn:readdb to read the device information of s1 and s2, and the detailed information is as follows:</p> <p>MAC,IP,SNMP_Community,CLI_Username,CLI_Password<br/> 06:DF:44:64:01:00,177.0.0.104,public, ,<br/> 06:E4:80:8E:02:00,177.0.0.105,public, ,</p> <p>Then, I use command snmp4sdn:topodiscoverswitches to discovery the two switches. But there is an ERROR log of java.lang.NullPointerException after executing the command snmp4sdn:topodiscoverswitches. The detailed information is as follows:</p> <p>2015-10-29 20:07:24,671 | INFO | l for user karaf | CmethUtil | 270 - org.opendaylight.snmp4sdn - 0.2.1.Lithium-SR1 | enter CmethUtil.readDB()<br/> 2015-10-29 20:07:24,671 | INFO | l for user karaf | CmethUtil | 270 - org.opendaylight.snmp4sdn - 0.2.1.Lithium-SR1 | open file /odl/switch_login_db.csv<br/> 2015-10-29 20:07:34,182 | INFO | l for user karaf | Controller | 270 - org.opendaylight.snmp4sdn - 0.2.1.Lithium-SR1 | Add switch(00:00:06:e4:80:8e:02:00) to the Controller<br/> 2015-10-29 20:07:34,701 | INFO | l for user karaf | Controller | 270 - org.opendaylight.snmp4sdn - 0.2.1.Lithium-SR1 | Add to switch (ip: 177.0.0.105, mac: 00:00:06:e4:80:8e:02:00) a new port, port number = 2<br/> 2015-10-29 20:07:34,703 | INFO | l for user karaf | Controller | 270 - org.opendaylight.snmp4sdn - 0.2.1.Lithium-SR1 | Add to switch (ip: 177.0.0.105, mac: 00:00:06:e4:80:8e:02:00) a new port, port number = 3<br/> 2015-10-29 20:07:34,704 | INFO | l for user karaf | Controller | 270 - org.opendaylight.snmp4sdn - 0.2.1.Lithium-SR1 | Add to switch (ip: 177.0.0.105, mac: 00:00:06:e4:80:8e:02:00) a new port, port number = 4<br/> 2015-10-29 20:07:34,712 | INFO | l for user karaf | Controller | 270 - org.opendaylight.snmp4sdn - 0.2.1.Lithium-SR1 | Add switch(00:00:06:df:44:64:01:00) to the Controller<br/> 2015-10-29 20:07:35,229 | INFO | l for user karaf | Controller | 270 - org.opendaylight.snmp4sdn - 0.2.1.Lithium-SR1 | Add to switch (ip: 177.0.0.104, mac: 00:00:06:df:44:64:01:00) a new port, port number = 2<br/> 2015-10-29 20:07:35,229 | INFO | l for user karaf | Controller | 270 - org.opendaylight.snmp4sdn - 0.2.1.Lithium-SR1 | Add to switch (ip: 177.0.0.104, mac: 00:00:06:df:44:64:01:00) a new port, port number = 3<br/> 2015-10-29 20:07:35,399 | ERROR | Thread-43 | TopologyServiceShim | 270 - org.opendaylight.snmp4sdn - 0.2.1.Lithium-SR1 | <br/> java.lang.NullPointerException<br/> at org.opendaylight.snmp4sdn.internal.TopologyServiceShim$TopologyNotify.run(TopologyServiceShim.java:138)<span class="error">&#91;270:org.opendaylight.snmp4sdn:0.2.1.Lithium-SR1&#93;</span><br/> at java.lang.Thread.run(Thread.java:745)<span class="error">&#91;:1.7.0_80&#93;</span></p> <p>Operating System: All<br/> Platform: All</p> SNMP4SDN-12

Java.lang.NullPointerException error occured when executing command snmp4sdn:topodiscoverswitches

Bug Resolved Done Unassigned Nanfei Chen Fri, 30 Oct 2015 03:02:56 +0000 Thu, 19 Oct 2017 21:25:23 +0000 Wed, 2 Mar 2016 05:19:37 +0000 unspecified General 0 1 <p>The topology could be collected as you experimented in <a href="https://jira.opendaylight.org/browse/SNMP4SDN-11" title="The result of calling rpc get-edge-list defined in topology.yang is false" class="issue-link" data-issue-key="SNMP4SDN-11"><del>SNMP4SDN-11</del></a>. So, does the problem here occur always or sometimes?</p> <p>When I did the experiments, the problem always occured when executing the command.</p> <p>I have submitted a change for this bug.</p> <p><a href="https://git.opendaylight.org/gerrit/#/c/35253/" class="external-link" target="_blank" rel="nofollow noopener">https://git.opendaylight.org/gerrit/#/c/35253/</a></p> <p>See the patch, agree that we missed to check null pointer. But I wonder why it fixes the problem, could you simply explain why?</p> <p>Sorry about my careless of no description.</p> <p>There was a problem in method run of class TopologyNotify.</p> <p>When I traced the code, I found there was such a container whose </p> <p>ITopologyServiceShimListener in map topologyServiceShimListeners was null.</p> <p>And then, the method edgeUpdate of this null ITopologyServiceShimListener was called without checking whether it was null, so the Java.lang.NullPointerException error occured.</p> <p>When I checked whether the ITopologyServiceShimListener corresponding to every container was null before calling its method edgeUpdate, there was not Java.lang.NullPointerException error any more.</p> <p>I see, thanks for your fixing, code is merged now.</p> Development External issue ID 4559 External issue URL Rank 0|i02v9b: