Mon Dec 9 2019 20:25:28 UTC
It's not a bug. It's an undocumented feature.
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ID Product Comp Assignee Status Resolution Summary Changed
59890 Tomcat M jdbc-poo dev RESO DUPL Tomcat jdbc 7.0.68 : Caused by: java.lang.IllegalArgumentException: Comparison method violates its general contract! ( Similar to Bug 58489 : https://bz.apache.org/bugzilla/show_bug.cgi?id=58489) 2016-07-24
One bug found.

as

File a new bug in the "jdbc-pool" component of the "Tomcat Modules" product