java.lang.IllegalArgumentException: Comparison method violates its general contract!
   at java.util.ComparableTimSort.mergeLo(ComparableTimSort.java:714)
   at java.util.ComparableTimSort.mergeAt(ComparableTimSort.java:451)
   at java.util.ComparableTimSort.mergeCollapse(ComparableTimSort.java:376)
   at java.util.ComparableTimSort.sort(ComparableTimSort.java:182)
   at java.util.ComparableTimSort.sort(ComparableTimSort.java:146)
   at java.util.Arrays.sort(Arrays.java:472)
   at java.util.Collections.sort(Collections.java:155)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.find(NexusRepositoryIndexerImpl.java:1346)
   at org.netbeans.modules.maven.indexer.NexusRepositoryIndexerImpl.find(NexusRepositoryIndexerImpl.java:1271)
   at org.netbeans.modules.maven.indexer.api.RepositoryQueries.findResult(RepositoryQueries.java:525)
   at org.netbeans.modules.maven.nodes.AddDependencyPanel$QueryPanel$2.run(AddDependencyPanel.java:1136)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1432)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2044)