ERROR - An error occurred. java.lang.IllegalArgumentException: Comparison method violates its general contract

Problem

The following error log message is observed in the hivemq.log when using 4.30 or 4.28.3

ERROR - An error occurred.
java.lang.IllegalArgumentException: Comparison method violates its general contract!
	at java.base/java.util.TimSort.mergeHi(TimSort.java:903)
	at java.base/java.util.TimSort.mergeAt(TimSort.java:520)
	at java.base/java.util.TimSort.mergeForceCollapse(TimSort.java:461)
	at java.base/java.util.TimSort.sort(TimSort.java:254)
	at java.base/java.util.Arrays.sort(Arrays.java:1234)
	at com.google.common.collect.ImmutableList.sortedCopyOf(Source.java:348)
	at hmq.nj.f.a(Source.java:61)
	at hmq.nj.c.f(Source.java:206)
	at hmq.nj.c.e(Source.java:188)
	at java.base/java.lang.Thread.run(Thread.java:1583

Solution

Ignore the error message.

The issue should be fixed in HiveMQ v.4.31

ERROR - An error occurred. java.lang.IllegalArgumentException: Comparison method violates its general contract

Problem

Solution

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