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https://issues.apache.org/jira/browse/WICKET-6702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17017984#comment-17017984
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Tobias Haupt commented on WICKET-6702:
--------------------------------------
I'm also facing a related Problem while accessing a page that is currently
serialized. It only appears when I trigger a big number of Ajax requests to the
same page instance. I use the current version of wicket 8.7.0.
I put a debugger breakpoint into
java.util.ArrayList.writeObject(ArrayList.java:766) and found out that the
list, that is concurrently modified, is the children list of MarkupContainer.
In my case the exception is triggered by a list (Repeater) that clears and
rebuilds the contained elements.
Its hard to build a quickstart because it is a timing problem. In my case the
serialized page is relatively big in terms of contained Components. It takes
some time to serialize it.
{code:java}
org.apache.wicket.WicketRuntimeException:
java.util.ConcurrentModificationException
at
org.apache.wicket.serialize.java.JavaSerializer$SerializationCheckerObjectOutputStream.writeObjectOverride(JavaSerializer.java:402)
~[wicket-core.j
ar:8.7.0]
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:344)
~[?:1.8.0_144]
at
org.apache.wicket.serialize.java.JavaSerializer.serialize(JavaSerializer.java:82)
[wicket-core.jar:8.7.0]
at
org.apache.wicket.pageStore.AbstractPageStore.serializePage(AbstractPageStore.java:133)
[wicket-core.jar:8.7.0]
at
org.apache.wicket.pageStore.DefaultPageStore.createSerializedPage(DefaultPageStore.java:281)
[wicket-core.jar:8.7.0]
at
org.apache.wicket.pageStore.DefaultPageStore.storePage(DefaultPageStore.java:61)
[wicket-core.jar:8.7.0]
at
org.apache.wicket.pageStore.AsynchronousPageStore$PageSavingRunnable.run(AsynchronousPageStore.java:208)
[wicket-core.jar:8.7.0]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_144]
Caused by: java.util.ConcurrentModificationException
at java.util.ArrayList.writeObject(ArrayList.java:766) ~[?:1.8.0_144]
at sun.reflect.GeneratedMethodAccessor183.invoke(Unknown Source) ~[?:?]
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
~[?:1.8.0_144]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_144]
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1028)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
~[?:1.8.0_144]
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
~[?:1.8.0_144]
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
~[?:1.8.0_144]
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
~[?:1.8.0_144]
at
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
~[?:1.8.0_144]
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
~[?:1.8.0_144]
at java.util.ArrayList.writeObject(ArrayList.java:762) ~[?:1.8.0_144]
at sun.reflect.GeneratedMethodAccessor183.invoke(Unknown Source) ~[?:?]
[... ommited]{code}
> AsynchronousPageStore with NotDetachedModelChecker - "Not detached model
> found" exception on several fast sequential Ajax calls
> -------------------------------------------------------------------------------------------------------------------------------
>
> Key: WICKET-6702
> URL: https://issues.apache.org/jira/browse/WICKET-6702
> Project: Wicket
> Issue Type: Bug
> Components: wicket-core
> Affects Versions: 8.5.0
> Reporter: Sergei Tkachuk
> Priority: Major
> Attachments: QuickStart.zip
>
>
> Preconditions: Application uses AsynchronousPageStore (as it is by default).
> When there are several fast sequential Ajax calls to a component, then a
> component's LoadableDetachableModel gets attached and detached several times
> before real async serialization takes place. And at times the serialization
> is initiated when the model has been already attached once again by a
> subsequent Ajax call, and not detached yet as the request is still in
> progress. This causes NotDetachedModelChecker() to throw "Not detached model
> found!" exception
> Disabling async serialization fixes the problem.
> A test-case and a log attached.
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