Stack trace of the issue:
[art-exec-273] ERROR o.a.a.g.i.GemsLocalIndexHandler:223 - Could not recalculate index for repository gems-local java.lang.IllegalArgumentException: Comparison method violates its general contract! at java.util.ComparableTimSort.mergeHi(ComparableTimSort.java:866) at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:483) at java.util.ComparableTimSort.mergeCollapse(ComparableTimSort.java:406) at java.util.ComparableTimSort.sort(ComparableTimSort.java:213) at java.util.Arrays.sort(Arrays.java:1312) at java.util.Arrays.sort(Arrays.java:1506) at java.util.ArrayList.sort(ArrayList.java:1462) at java.util.Collections.sort(Collections.java:141) at org.artifactory.addon.gems.helpers.FinderHelper.buildNameVersionPlatformTuples(FinderHelper.java:184) at org.artifactory.addon.gems.helpers.RecalculateIndexHelper.getIndexEntries(RecalculateIndexHelper.java:52) at org.artifactory.addon.gems.helpers.RecalculateIndexHelper.recalculateIndex(RecalculateIndexHelper.java:36) at org.artifactory.addon.gems.index.GemsLocalIndexHandler.doRecalculateIndex(GemsLocalIndexHandler.java:213) at org.artifactory.addon.gems.index.GemsLocalIndexHandler.recalculateIndex(GemsLocalIndexHandler.java:169) at org.artifactory.addon.gems.GemsAddonImpl.reindexAsync(GemsAddonImpl.java:61) ...