Hi again, I've checked our own code again.. And on our team decided to have a seperate list of wicket components in a wicket page.. After refactoring this to use IVisitor it went away.. So please disregard previous mail:)
On Mon, Jan 7, 2019 at 11:00 AM nino martinez wael < nino.martinez.w...@gmail.com> wrote: > Hi everyone, im one of the maintainers of pax wicket, and since we have > upgraded to wicket 8.1 I am regularly getting this, the project I am > getting this on are not using apache commons LinkedMap: > > 2019-01-07T09:58:04,024 | ERROR | > org.ops4j.pax.wicket.util.serialization.PaxWicketObjectOutputStream | > Wicket-AsyncPageStore-PageSavingThread | PaxWicketObjectOutputStream | > 166 - org.ops4j.pax.wicket.service - 5.0.0 | error writing object [Page > class = dk.netdesign.wallboard.frontend.pages.ViewerPage, id = 0, render > count = 2848]: null > java.util.ConcurrentModificationException: null > at java.util.ArrayList.writeObject(Unknown Source) ~[?:?] > at sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source) ~[?:?] > at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:?] > at java.lang.reflect.Method.invoke(Unknown Source) ~[?:?] > at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.writeSerialData(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.writeObject0(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.writeSerialData(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.writeObject0(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.writeSerialData(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.writeObject0(Unknown Source) ~[?:?] > at java.io.ObjectOutputStream.writeObject(Unknown Source) ~[?:?] > at > org.apache.commons.collections4.map.AbstractHashedMap.doWriteObject(AbstractHashedMap.java:1234) > ~[?:?] > at > org.apache.commons.collections4.map.LinkedMap.writeObject(LinkedMap.java:124) > ~[?:?] > at sun.reflect.GeneratedMethodAccessor184.invoke(Unknown Source) ~[?:?] > > which points me to a little down the stack trace to > > https://github.com/ops4j/org.ops4j.pax.wicket/blob/master/service/src/main/java/org/ops4j/pax/wicket/util/serialization/PaxWicketObjectOutputStream.java#L58 > > Im wondering if this implemementation are wrong? > > I can see that Wicket are using the LinkedMap here and are wondering why > it could throw ConcurrentModificationException: > > > https://github.com/apache/wicket/blob/master/wicket-core/src/main/java/org/apache/wicket/MarkupContainer.java#L1172 > > > (thanks for helping out) > -- > Best regards / Med venlig hilsen > Nino Martinez > -- Best regards / Med venlig hilsen Nino Martinez
