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https://issues.apache.org/jira/browse/ISIS-3315?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andi Huber resolved ISIS-3315.
------------------------------
Resolution: Duplicate
> Apache Isis sorting fails with: Comparison method violates its general
> contract!
> --------------------------------------------------------------------------------
>
> Key: ISIS-3315
> URL: https://issues.apache.org/jira/browse/ISIS-3315
> Project: Isis
> Issue Type: Bug
> Components: Isis Core
> Affects Versions: 2.0.0-M7
> Environment: OpenJDK 64-Bit Server VM (build 18.0.2.1+1-1, mixed
> mode, sharing)
> OpenJDK 64-Bit Server VM Temurin-18+36 (build 18+36, mixed mode, sharing)
> Reporter: Miroslav Holubec
> Assignee: Andi Huber
> Priority: Major
> Fix For: 2.0.0-RC1
>
>
> Apache ISIS own comparator fails with IllegalArgumentException sorting our
> data. I've created a [sample
> snippet|https://gist.github.com/myroch/c26b97ec83e9168176e43b2ced4f9a08] to
> proof this.
> The comparator used in the snippet is that one from
> ManagedObjects.NATURAL_NULL_FIRST, I've just put for simplicity the
> complexity of ManagedObject away.
> Occured on 2.0.0-M7, but as I checked the code this affects propably all
> 2.0.0 versions
> Stacktrace:
> {noformat}
> Caused by: java.lang.IllegalArgumentException: Comparison method violates its
> general contract!
> at java.util.TimSort.mergeLo(TimSort.java:781) ~[?:?]
> at java.util.TimSort.mergeAt(TimSort.java:518) ~[?:?]
> at java.util.TimSort.mergeCollapse(TimSort.java:448) ~[?:?]
> at java.util.TimSort.sort(TimSort.java:245) ~[?:?]
> at java.util.Arrays.sort(Arrays.java:1307) ~[?:?]
> at java.util.ArrayList.sort(ArrayList.java:1721) ~[?:?]
> at
> org.apache.isis.commons.collections.Can_Multiple.sorted(Can_Multiple.java:121)
> ~[isis-commons-2.0.0-M7.jar:2.0.0-M7]
> at
> org.apache.isis.viewer.wicket.ui.components.collectioncontents.ajaxtable.CollectionContentsSortableDataProvider.sorted(CollectionContentsSortableDataProvider.java:83)
> ~[isis-viewer-wicket-ui-2.0.0-M7.jar:2.0.0-M7]
> at
> org.apache.isis.viewer.wicket.ui.components.collectioncontents.ajaxtable.CollectionContentsSortableDataProvider.iterator(CollectionContentsSortableDataProvider.java:73)
> ~[isis-viewer-wicket-ui-2.0.0-M7.jar:2.0.0-M7]
> at
> org.apache.wicket.markup.repeater.data.DataViewBase$ModelIterator.<init>(DataViewBase.java:107)
> ~[wicket-core-8.13.0.jar:8.13.0]
> at
> org.apache.wicket.markup.repeater.data.DataViewBase.getItemModels(DataViewBase.java:74)
> ~[wicket-core-8.13.0.jar:8.13.0]
> at
> org.apache.wicket.markup.repeater.AbstractPageableView.getItemModels(AbstractPageableView.java:99)
> ~[wicket-core-8.13.0.jar:8.13.0]
> at
> org.apache.wicket.markup.repeater.RefreshingView.onPopulate(RefreshingView.java:93)
> ~[wicket-core-8.13.0.jar:8.13.0]
> at
> org.apache.wicket.markup.repeater.AbstractRepeater.onBeforeRender(AbstractRepeater.java:124)
> ~[wicket-core-8.13.0.jar:8.13.0]
> at
> org.apache.wicket.markup.repeater.AbstractPageableView.onBeforeRender(AbstractPageableView.java:113)
> ~[wicket-core-8.13.0.jar:8.13.0]
> at org.apache.wicket.Component.beforeRender(Component.java:947)
> ~[wicket-core-8.13.0.jar:8.13.0]
> at
> org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1741)
> ~[wicket-core-8.13.0.jar:8.13.0]
> ... 107 more
> {noformat}
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