[jboss-jira] [JBoss JIRA] (DROOLS-4866) ActivationsSorter: Comparison method violates its general contract!

[Mario Fusco (Jira)]

     [ https://issues.redhat.com/browse/DROOLS-4866?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco updated DROOLS-4866:
--------------------------------
    Sprint: 2019 Week 50-52 (from Dec 9)


> ActivationsSorter: Comparison method violates its general contract!
> -------------------------------------------------------------------
>
>                 Key: DROOLS-4866
>                 URL: https://issues.redhat.com/browse/DROOLS-4866
>             Project: Drools
>          Issue Type: Bug
>    Affects Versions: 7.30.0.Final
>         Environment: - JDK 1.8.0_181 (64 bit)
>            Reporter: Leonid Sotnikov
>            Assignee: Mario Fusco
>            Priority: Major
>         Attachments: sorttest.zip
>
>
> Hi.
> While serializing a session with ProtobufOutputMarshaller we've encountered an exception in a few rare cases when the activations are sorted by {{Collections.sort( dormant, ActivationsSorter.INSTANCE )}}:
> {code}
> Caused by: java.lang.IllegalArgumentException: Comparison method violates its general contract!
> 	at java.util.TimSort.mergeHi(TimSort.java:899)
> 	at java.util.TimSort.mergeAt(TimSort.java:516)
> 	at java.util.TimSort.mergeForceCollapse(TimSort.java:457)
> 	at java.util.TimSort.sort(TimSort.java:254)
> 	at java.util.Arrays.sort(Arrays.java:1512)
> 	at java.util.ArrayList.sort(ArrayList.java:1462)
> 	at java.util.Collections.sort(Collections.java:175)
> 	(...)
> {code}



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