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https://issues.apache.org/jira/browse/OAK-2442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14291647#comment-14291647
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Marcel Reutegger commented on OAK-2442:
---------------------------------------
OAK-2421 could be the reason why there are documents in MongoDB with an empty
map. However, I don't see how this is possible before this change. As you noted
already, changes on a document are usually only appended to a map and not
removed. With OAK-2421 a clean up is introduced for uncommitted changes. I
assume the jcr:mixinTypes map contained such an entry. It is probably not
possible anymore to find out how the map was introduced.
I agree with Chetan, the NodeDocument must check if a map is empty. I'll create
a test to reproduce the problem.
> NoSuchElementException thrown by NodeDocument
> ---------------------------------------------
>
> Key: OAK-2442
> URL: https://issues.apache.org/jira/browse/OAK-2442
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: core
> Reporter: Chetan Mehrotra
> Assignee: Marcel Reutegger
> Fix For: 1.1.6, 1.0.11
>
>
> Following error is seen with latest 1.0.9-SNAPSHOT builds on some system
> {noformat}
> Caused by: java.util.NoSuchElementException: null
> at java.util.TreeMap.key(TreeMap.java:1221)
> at java.util.TreeMap.firstKey(TreeMap.java:285)
> at
> java.util.Collections$UnmodifiableSortedMap.firstKey(Collections.java:1549)
> at
> com.google.common.collect.ForwardingSortedMap.firstKey(ForwardingSortedMap.java:73)
> at
> org.apache.jackrabbit.oak.plugins.document.NodeDocument.getNodeAtRevision(NodeDocument.java:819)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.readNode(DocumentNodeStore.java:930)
> {noformat}
> Most likely the above occurs because a {{TreeMap}} associated with some key
> in NodeDocument is empty.
> {noformat}
> 23.01.2015 01:57:23.308 *WARN*
> [pool-11-thread-5]org.apache.jackrabbit.oak.plugins.observation.NodeObserver
> Error whiledispatching observation
> eventscom.google.common.util.concurrent.UncheckedExecutionException:com.google.common.util.concurrent.UncheckedExecutionException:java.util.NoSuchElementException
> at
> com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2199)
> at com.google.common.cache.LocalCache.get(LocalCache.java:3932)
> at
> com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4721)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.getChildren(DocumentNodeStore.java:731)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.diffImpl(DocumentNodeStore.java:1666)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.access$200(DocumentNodeStore.java:105)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore$7.call(DocumentNodeStore.java:1260)
> at
> org.apache.jackrabbit.oak.plugins.document.MongoDiffCache.getChanges(MongoDiffCache.java:88)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.diffChildren(DocumentNodeStore.java:1255)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeState.compareAgainstBaseState(DocumentNodeState.java:260)
> at
> org.apache.jackrabbit.oak.plugins.observation.EventGenerator$Continuation.run(EventGenerator.java:172)
> at
> org.apache.jackrabbit.oak.plugins.observation.EventGenerator.generate(EventGenerator.java:118)
> at
> org.apache.jackrabbit.oak.plugins.observation.NodeObserver.contentChanged(NodeObserver.java:156)
> at
> org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:117)
> at
> org.apache.jackrabbit.oak.spi.commit.BackgroundObserver$1$1.call(BackgroundObserver.java:111)
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:744)
> Caused by:
> com.google.common.util.concurrent.UncheckedExecutionException:java.util.NoSuchElementException
> at
> com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2199)
> at com.google.common.cache.LocalCache.get(LocalCache.java:3932)
> at
> com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4721)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.getNode(DocumentNodeStore.java:704)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.readChildren(DocumentNodeStore.java:786)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore$4.call(DocumentNodeStore.java:734)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore$4.call(DocumentNodeStore.java:731)
> at
> com.google.common.cache.LocalCache$LocalManualCache$1.load(LocalCache.java:4724)
> at
> com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3522)
> at
> com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2315)
> at
> com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2278)
> at
> com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2193)
> ... 18 common frames omitted
> Caused by: java.util.NoSuchElementException: null
> at java.util.TreeMap.key(TreeMap.java:1221)
> at java.util.TreeMap.firstKey(TreeMap.java:285)
> at
> java.util.Collections$UnmodifiableSortedMap.firstKey(Collections.java:1549)
> at
> com.google.common.collect.ForwardingSortedMap.firstKey(ForwardingSortedMap.java:73)
> at
> org.apache.jackrabbit.oak.plugins.document.NodeDocument.getNodeAtRevision(NodeDocument.java:819)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore.readNode(DocumentNodeStore.java:930)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore$3.call(DocumentNodeStore.java:707)
> at
> org.apache.jackrabbit.oak.plugins.document.DocumentNodeStore$3.call(DocumentNodeStore.java:704)
> at
> com.google.common.cache.LocalCache$LocalManualCache$1.load(LocalCache.java:4724)
> at
> com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3522)
> at
> com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2315)
> at
> com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2278)
> at
> com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2193)
> {noformat}
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