Miroslav Holubec created ISIS-3315:
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Summary: 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 Temurin-18+36 (build 18+36,
mixed mode, sharing)
Reporter: Miroslav Holubec
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
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