[OPNFLWPLUG-212] Doesn't setup node inventory because of ConflictingModificationAppliedException

Mon, 27 Sep 2021 09:01:15 +0000

Connecting an OF13 OVS to the controller lately, I get errors that seem to be related to updating the inventory. Once the switches are connected, a GET on the inventory looks like:

{
"nodes": {
"node": [

{ "id": "controller-config" }

]
}
}

This causes the topology manager to go crazy and of course nothing works.

Here's the errors:

2014-07-09 11:32:22.475 PDT [pool-16-thread-1] WARN o.o.c.m.s.d.s.i.InMemoryDOMDataStore - Store Tx: DOM-OPER-28 Conflicting modification for (urn:opendaylight:inventory?revision=2013-08-19)nodes/(urn:opendaylight:inventory?revision=2013-08-19)node/(urn:opendaylight:inventory?revision=2013-08-19)node[

{(urn:opendaylight:inventory?revision=2013-08-19)id=openflow:3}

].
2014-07-09 11:32:22.476 PDT [pool-16-thread-1] WARN o.o.c.m.s.d.b.i.DOMDataCommitCoordinatorImpl - Tx: DOM-28 Error during phase CAN_COMMIT, starting Abort
org.opendaylight.controller.md.sal.common.api.data.OptimisticLockFailedException: Optimistic lock failed.
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:321) ~[bundlefile:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:311) ~[bundlefile:na]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_55]
at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293) ~[bundlefile:na]
at com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:61) ~[bundlefile:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl.canCommit(InMemoryDOMDataStore.java:311) ~[bundlefile:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.canCommitAll(DOMDataCommitCoordinatorImpl.java:345) [bundlefile:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.canCommitBlocking(DOMDataCommitCoordinatorImpl.java:187) [bundlefile:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.call(DOMDataCommitCoordinatorImpl.java:164) [bundlefile:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.call(DOMDataCommitCoordinatorImpl.java:144) [bundlefile:na]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_55]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_55]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_55]
at java.lang.Thread.run(Thread.java:744) [na:1.7.0_55]
Caused by: org.opendaylight.yangtools.yang.data.api.schema.tree.ConflictingModificationAppliedException: Node was deleted by other transaction.
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkConflicting(SchemaAwareApplyOperation.java:80) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:167) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTree.validate(InMemoryDataTree.java:86) ~[na:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:315) ~[bundlefile:na]
... 13 common frames omitted
2014-07-09 11:32:22.477 PDT [pool-16-thread-1] WARN o.o.c.m.s.d.b.i.DOMDataCommitCoordinatorImpl - Tx: DOM-28 Error during phase CAN_COMMIT, starting Abort
org.opendaylight.controller.md.sal.common.api.data.OptimisticLockFailedException: Optimistic lock failed.
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:321) ~[bundlefile:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:311) ~[bundlefile:na]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_55]
at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293) ~[bundlefile:na]
at com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:61) ~[bundlefile:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl.canCommit(InMemoryDOMDataStore.java:311) ~[bundlefile:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.canCommitAll(DOMDataCommitCoordinatorImpl.java:345) [bundlefile:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.canCommitBlocking(DOMDataCommitCoordinatorImpl.java:187) [bundlefile:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.call(DOMDataCommitCoordinatorImpl.java:164) [bundlefile:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.call(DOMDataCommitCoordinatorImpl.java:144) [bundlefile:na]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_55]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_55]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_55]
at java.lang.Thread.run(Thread.java:744) [na:1.7.0_55]
Caused by: org.opendaylight.yangtools.yang.data.api.schema.tree.ConflictingModificationAppliedException: Node was deleted by other transaction.
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkConflicting(SchemaAwareApplyOperation.java:80) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:167) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTree.validate(InMemoryDataTree.java:86) ~[na:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:315) ~[bundlefile:na]
... 13 common frames omitted
2014-07-09 11:32:22.486 PDT [pool-16-thread-1] ERROR o.o.c.m.s.b.i.ForwardedBackwardsCompatibleDataBroker - Transaction DOM-28 failed to complete
org.opendaylight.controller.md.sal.common.api.data.OptimisticLockFailedException: Optimistic lock failed.
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:321) ~[na:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:311) ~[na:na]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_55]
at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293) ~[na:na]
at com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:61) ~[na:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl.canCommit(InMemoryDOMDataStore.java:311) ~[na:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.canCommitAll(DOMDataCommitCoordinatorImpl.java:345) ~[na:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.canCommitBlocking(DOMDataCommitCoordinatorImpl.java:187) ~[na:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.call(DOMDataCommitCoordinatorImpl.java:164) ~[na:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.call(DOMDataCommitCoordinatorImpl.java:144) ~[na:na]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_55]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_55]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_55]
at java.lang.Thread.run(Thread.java:744) [na:1.7.0_55]
Caused by: org.opendaylight.yangtools.yang.data.api.schema.tree.ConflictingModificationAppliedException: Node was deleted by other transaction.
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkConflicting(SchemaAwareApplyOperation.java:80) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:167) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTree.validate(InMemoryDataTree.java:86) ~[na:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:315) ~[na:na]
... 13 common frames omitted
2014-07-09 11:32:22.482 PDT [nioEventLoopGroup-9-7] INFO o.o.o.p.i.c.PublishingChannelInitializer - Incoming connection from (remote address): /127.0.0.1:42566 --> :6633
2014-07-09 11:32:22.499 PDT [nioEventLoopGroup-9-7] INFO o.o.o.p.i.c.PublishingChannelInitializer - Incoming connection accepted - building pipeline
2014-07-09 11:32:22.536 PDT [FlowCapableInventoryProvider] WARN o.o.c.m.i.m.FlowCapableInventoryProvider - Failed to commit inventory change
org.opendaylight.controller.md.sal.common.api.data.OptimisticLockFailedException: Optimistic lock failed.
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:321) ~[na:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:311) ~[na:na]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_55]
at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:293) ~[na:na]
at com.google.common.util.concurrent.AbstractListeningExecutorService.submit(AbstractListeningExecutorService.java:61) ~[na:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl.canCommit(InMemoryDOMDataStore.java:311) ~[na:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.canCommitAll(DOMDataCommitCoordinatorImpl.java:345) ~[na:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.canCommitBlocking(DOMDataCommitCoordinatorImpl.java:187) ~[na:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.call(DOMDataCommitCoordinatorImpl.java:164) ~[na:na]
at org.opendaylight.controller.md.sal.dom.broker.impl.DOMDataCommitCoordinatorImpl$CommitCoordinationTask.call(DOMDataCommitCoordinatorImpl.java:144) ~[na:na]
at java.util.concurrent.FutureTask.run(FutureTask.java:262) ~[na:1.7.0_55]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) ~[na:1.7.0_55]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) ~[na:1.7.0_55]
at java.lang.Thread.run(Thread.java:744) [na:1.7.0_55]
Caused by: org.opendaylight.yangtools.yang.data.api.schema.tree.ConflictingModificationAppliedException: Node was deleted by other transaction.
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkConflicting(SchemaAwareApplyOperation.java:80) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:167) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkChildPreconditions(NormalizedNodeContainerModificationStrategy.java:178) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.NormalizedNodeContainerModificationStrategy.checkSubtreeModificationApplicable(NormalizedNodeContainerModificationStrategy.java:168) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.SchemaAwareApplyOperation.checkApplicable(SchemaAwareApplyOperation.java:131) ~[na:na]
at org.opendaylight.yangtools.yang.data.impl.schema.tree.InMemoryDataTree.validate(InMemoryDataTree.java:86) ~[na:na]
at org.opendaylight.controller.md.sal.dom.store.impl.InMemoryDOMDataStore$ThreePhaseCommitImpl$1.call(InMemoryDOMDataStore.java:315) ~[na:na]
... 13 common frames omitted
2014-07-09 11:32:22.585 PDT [nioEventLoopGroup-9-7] INFO o.o.o.p.i.c.ConnectionAdapterImpl - Hello received / branch
2014-07-09 11:32:22.586 PDT [nioEventLoopGroup-9-7] WARN o.o.o.p.i.c.ResponseExpectedRpcListener - Request for RpcResultKey [xid=70, outputClazz=org.opendaylight.yang.gen.v1.urn.opendaylight.openflow.protocol.rev130731.GetFeaturesOutput] did not receive a response
2014-07-09 11:32:22.592 PDT [md-sal-binding-notification-7] INFO o.o.c.m.s.manager.StatisticsProvider - Attempted to get non-existing handler for Uri [_value=openflow:3]
2014-07-09 11:32:22.592 PDT [md-sal-binding-notification-29] INFO o.o.c.m.s.manager.StatisticsProvider - Attempted to get non-existing handler for Uri [_value=openflow:3]

OpenDaylight JIRA

[OPNFLWPLUG-212] Doesn't setup node inventory because of ConflictingModificationAppliedException