Patch request on a Netconf Mounted device throwing ClassCastException from YANG tools

We are seeing a issue with the HTTP PATCH request on a particular model on the NETCONF mounted resource. PATCH request works fine on certain models hosted inside ODL. But this issue is related to a model on a NETCONF mounted device.

Here are the steps we did. We made sure PUT call works.

Request Type : PUT

URL : http://controller:port/restconf/config/network-topology:network-topology/topology/topology-netconf/node/node/yang-ext:mount/exa-base:config/profile/dhcp-v4-server-profile/dhcp-profile-name/

Payload :

{
"dhcp-v4-server-profile":
{
"name": "dhcp-profile-name",
"pool": [
"dhcp-pool-name"
]
}

}

PUT call works.

We wanted to use the PATCH request to manipulate the leaf-list. In the above request "pool" is a leaf-list.

We tried this PATCH request

Request Type : PATCH

URL : http://controller:port/restconf/config/network-topology:network-topology/topology/topology-netconf/node/node/yang-ext:mount/exa-base:config/profile/dhcp-v4-server-profile/dhcp-profile-name/

Payload :

{
"ietf-restconf:yang-patch" :
{
"patch-id" : "0",
"edit" :
[
{
"edit-id" : "edit1",
"operation" : "merge",
"target" : "",
"value" :
{
"dhcp-v4-server-profile":

{ "name": "profile1", "pool": [ "pool1" ] }

}
}
]
}
}

The request itself returns success in restconf and we obtain this output.

{
"ietf-yang-patch:yang-patch-status":

{ "patch-id": "0", "ok": [ null ] }

}

However we don't see the desired result and we see the ClassCastException by YANG tools in the karaf.log.

17-11-13 03:03:16,519 | ERROR | ult-dispatcher-3 | OneForOneStrategy | 180 - com.typesafe.akka.slf4j - 2.4.18 | org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableMapNodeBuilder$ImmutableMapNode cannot be cast to org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode
java.lang.ClassCastException: org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableMapNodeBuilder$ImmutableMapNode cannot be cast to org.opendaylight.yangtools.yang.data.api.schema.MapEntryNode
at org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableMapNodeBuilder.withValue(ImmutableMapNodeBuilder.java:81)[102:org.opendaylight.yangtools.yang-data-impl:1.1.1.Carbon]
at org.opendaylight.yangtools.yang.data.impl.schema.builder.impl.ImmutableMapNodeBuilder.withValue(ImmutableMapNodeBuilder.java:28)[102:org.opendaylight.yangtools.yang-data-impl:1.1.1.Carbon]
at org.opendaylight.yangtools.yang.data.impl.schema.InstanceIdToCompositeNodes.create(InstanceIdToCompositeNodes.java:104)[102:org.opendaylight.yangtools.yang-data-impl:1.1.1.Carbon]
at org.opendaylight.yangtools.yang.data.impl.schema.InstanceIdToCompositeNodes.create(InstanceIdToCompositeNodes.java:101)[102:org.opendaylight.yangtools.yang-data-impl:1.1.1.Carbon]
at org.opendaylight.yangtools.yang.data.impl.schema.InstanceIdToCompositeNodes.create(InstanceIdToCompositeNodes.java:101)[102:org.opendaylight.yangtools.yang-data-impl:1.1.1.Carbon]
at org.opendaylight.yangtools.yang.data.impl.schema.InstanceIdToCompositeNodes.create(InstanceIdToCompositeNodes.java:101)[102:org.opendaylight.yangtools.yang-data-impl:1.1.1.Carbon]
at org.opendaylight.yangtools.yang.data.impl.schema.InstanceIdToCompositeNodes.create(InstanceIdToCompositeNodes.java:101)[102:org.opendaylight.yangtools.yang-data-impl:1.1.1.Carbon]
at org.opendaylight.yangtools.yang.data.impl.schema.ImmutableNodes.fromInstanceId(ImmutableNodes.java:136)[102:org.opendaylight.yangtools.yang-data-impl:1.1.1.Carbon]
at org.opendaylight.netconf.sal.connect.netconf.util.NetconfMessageTransformUtil.createEditConfigAnyxml(NetconfMessageTransformUtil.java:294)[300:org.opendaylight.netconf.sal-netconf-connector:1.5.1.Carbon]
at org.opendaylight.netconf.sal.connect.netconf.util.NetconfRpcStructureTransformer.createEditConfigStructure(NetconfRpcStructureTransformer.java:39)[300:org.opendaylight.netconf.sal-netconf-connector:1.5.1.Carbon]
at org.opendaylight.netconf.sal.connect.netconf.util.NetconfBaseOps.createEditConfigStrcture(NetconfBaseOps.java:261)[300:org.opendaylight.netconf.sal-netconf-connector:1.5.1.Carbon]
at org.opendaylight.netconf.sal.connect.netconf.sal.tx.AbstractWriteTx.merge(AbstractWriteTx.java:117)[300:org.opendaylight.netconf.sal-netconf-connector:1.5.1.Carbon]
at org.opendaylight.netconf.sal.connect.netconf.sal.tx.ReadWriteTx.merge(ReadWriteTx.java:47)[300:org.opendaylight.netconf.sal-netconf-connector:1.5.1.Carbon]
at org.opendaylight.netconf.topology.singleton.impl.actors.WriteAdapter.handle(WriteAdapter.java:60)[303:org.opendaylight.netconf.topology-singleton:1.2.1.Carbon]
at org.opendaylight.netconf.topology.singleton.impl.actors.ReadWriteTransactionActor.onReceive(ReadWriteTransactionActor.java:56)[303:org.opendaylight.netconf.topology-singleton:1.2.1.Carbon]
at akka.actor.UntypedActor$$anonfun$receive$1.applyOrElse(UntypedActor.scala:165)[179:com.typesafe.akka.actor:2.4.18]
at akka.actor.Actor$class.aroundReceive(Actor.scala:502)[179:com.typesafe.akka.actor:2.4.18]
at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:95)[179:com.typesafe.akka.actor:2.4.18]
at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)[179:com.typesafe.akka.actor:2.4.18]
at akka.actor.ActorCell.invoke(ActorCell.scala:495)[179:com.typesafe.akka.actor:2.4.18]
at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)[179:com.typesafe.akka.actor:2.4.18]
at akka.dispatch.Mailbox.run(Mailbox.scala:224)[179:com.typesafe.akka.actor:2.4.18]
at akka.dispatch.Mailbox.exec(Mailbox.scala:234)[179:com.typesafe.akka.actor:2.4.18]
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)[175:org.scala-lang.scala-library:2.11.11.v20170413-090219-8a413ba7cc]
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)[175:org.scala-lang.scala-library:2.11.11.v20170413-090219-8a413ba7cc]
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)[175:org.scala-lang.scala-library:2.11.11.v20170413-090219-8a413ba7cc]
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)[175:org.scala-lang.scala-library:2.11.11.v20170413-090219-8a413ba7cc]

We tried with "merge", "create" and "replace" as the PATCH operations and saw the same error.

However the "remove" PATCH operation on the same call works and it removes the entry.

Request Type : PATCH

URL : http://controller:port/restconf/config/network-topology:network-topology/topology/topology-netconf/node/node/yang-ext:mount/exa-base:config/profile/dhcp-v4-server-profile/dhcp-profile-name/

Payload :

{
"ietf-restconf:yang-patch" :
{
"patch-id" : "0",
"edit" :
[

{ "edit-id" : "edit1", "operation" : "remove", "target" : "" }

]
}
}

This call successfully removes the entity.

SO I think the issue is is parsing the payload in the create/merge operations on mounted resources for the PATCH command in this scenario.