2017-11-22 07:42:56,832 | ERROR | eChangeHandler-0 | AsyncDataTreeChangeListenerBase | 247 - org.opendaylight.genius.mdsalutil-api - 0.4.0.SNAPSHOT | Thread terminated due to uncaught exception: org.opendaylight.yang.gen.v1.urn.opendaylight.neutron.ports.rev150712.ports.attributes.ports.Port_AsyncDataTreeChangeListenerBase-DataTreeChangeHandler-0
java.lang.NullPointerException: dpnId
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:799)[27:com.google.guava:22.0.0]
at org.opendaylight.genius.mdsalutil.FlowEntityBuilder.setDpnId(FlowEntityBuilder.java:321)[247:org.opendaylight.genius.mdsalutil-api:0.4.0.SNAPSHOT]
at org.opendaylight.genius.mdsalutil.MDSALUtil.buildFlowEntity(MDSALUtil.java:120)[247:org.opendaylight.genius.mdsalutil-api:0.4.0.SNAPSHOT]
at org.opendaylight.netvirt.ipv6service.utils.Ipv6ServiceUtils.installIcmpv6NsPuntFlow(Ipv6ServiceUtils.java:409)[333:org.opendaylight.netvirt.ipv6service-impl:0.6.0.SNAPSHOT]
at org.opendaylight.netvirt.ipv6service.IfMgr.programIcmpv6NSPuntFlowForAddress(IfMgr.java:553)[333:org.opendaylight.netvirt.ipv6service-impl:0.6.0.SNAPSHOT]
at org.opendaylight.netvirt.ipv6service.IfMgr.addRouterIntf(IfMgr.java:263)[333:org.opendaylight.netvirt.ipv6service-impl:0.6.0.SNAPSHOT]
at org.opendaylight.netvirt.ipv6service.NeutronPortChangeListener.addInterfaceInfo(NeutronPortChangeListener.java:121)[333:org.opendaylight.netvirt.ipv6service-impl:0.6.0.SNAPSHOT]
at org.opendaylight.netvirt.ipv6service.NeutronPortChangeListener.add(NeutronPortChangeListener.java:69)[333:org.opendaylight.netvirt.ipv6service-impl:0.6.0.SNAPSHOT]
at org.opendaylight.netvirt.ipv6service.NeutronPortChangeListener.add(NeutronPortChangeListener.java:30)[333:org.opendaylight.netvirt.ipv6service-impl:0.6.0.SNAPSHOT]
at org.opendaylight.genius.datastoreutils.AsyncDataTreeChangeListenerBase$DataTreeChangeHandler.run(AsyncDataTreeChangeListenerBase.java:150)[247:org.opendaylight.genius.mdsalutil-api:0.4.0.SNAPSHOT]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)[:1.8.0_151]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)[:1.8.0_151]
at java.lang.Thread.run(Thread.java:748)[:1.8.0_151]