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

[Leonid Sotnikov (Jira)]

Leonid Sotnikov created DROOLS-4866:
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             Summary: 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
         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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