re: NullPointerException in FourColorTree using UniqueList

Just a thought, probably doesn't apply in this case, but I figured it wouldn't hurt to ask:

 

Are you adding elements directly to the unique list, or to the ThreadSafeList?  If you are adding directly to any list except the ThreadSafeList, are you using proper locking semantics on the list pipeline?

 

- K

 

Hi,

We sometimes get an NPE in FourColorTree from within UniqueList.  We are
using version 1.7.0.

java.lang.NullPointerException
   at
ca.odell.glazedlists.impl.adt.barcode2.FourColorTree.convertIndexColor(FourColorTree.java:875)
   at ca.odell.glazedlists.event.Tree4Deltas.update(Tree4Deltas.java:73)
   at
ca.odell.glazedlists.event.ListEventAssembler$Tree4DeltasAssembler.addChange(ListEventAssembler.java:545)
   at
ca.odell.glazedlists.event.ListEventAssembler.addChange(ListEventAssembler.java:150)
   at
ca.odell.glazedlists.event.ListEventAssembler.addChange(ListEventAssembler.java:156)
   at
ca.odell.glazedlists.event.ListEventAssembler.addUpdate(ListEventAssembler.java:174)
   at
ca.odell.glazedlists.UniqueList$GrouperClient.groupChanged(UniqueList.java:108)
   at ca.odell.glazedli sts.impl.Grouper.listChanged(Grouper.java:190)
   at ca.odell.glazedlists.UniqueList.listChanged(UniqueList.java:209)
   at
ca.odell.glazedlists.event.ListEventAssembler$ListSequencePublisherAdapter$ListEventFormat.fire(ListEventAssembler.java:869)
   at
ca.odell.glazedlists.event.ListEventAssembler$ListSequencePublisherAdapter$ListEventFormat.fire(ListEventAssembler.java:861)
   at
ca.odell.glazedlists.event.SequenceDependenciesEventPublisher$SubjectAndListener.firePendingEvent(SequenceDependenciesEventPublisher.java:435)
   at
ca.odell.glazedlists.event.SequenceDependenciesEventPublisher.fireEvent(SequenceDependenciesEventPublisher.java:334)
   at
ca.odell.glazedlists.event.ListEventAssembler$ListSequencePublisherAdapter.fireEvent(ListEventAssembler.java:855)
   at
ca.odell.glazedlists.event.ListEventAssembler$AssemblerHelper.commi tEvent(ListEventAssembler.java:389)
   at
ca.odell.glazedlists.event.ListEventAssembler.commitEvent(ListEventAssembler.java:226)
   at ca.odell.glazedlists.BasicEventList.add(BasicEventList.java:125)
   at ca.odell.glazedlists.impl.ThreadSafeList.add(ThreadSafeList.java:178)

It is difficult to reproduce, but we think it occurs when a new element is
added to the unique list. All events should be occuring on the Swing EDT.
Our complete list chain is long, and we feed list selection back into the
chain at FilterList1:

ThreadSafeList -> GroupingList -> FunctionList -> ObservableList ->
FilterList1 -> FunctionList -> FilterList2 -> UniqueList -> SortedList ->
EventSelectionModel -> Matcher -> MatcherEditor -> FilterList1

I'm thinking about writing my own code to replace the UniqueList piece.

Any suggestions would be appreciated.

Regards,< BR>Ernie Yu
--
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