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The July 2020 security update has caused a regression in the behaviour of the ForkJoinPool:

https://bugs.openjdk.java.net/browse/JDK-8249677

This regression is specific to OpenJDK and does not happen with the equivalent proprietary Oracle release.

Upstream, we are planning an 8u265 release to correct this. We should try and ship this in RHEL ASAP.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (java-1.8.0-openjdk bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:3549