• Tests to show that de/serialization of ConcurrentHashMap fails #130
• Payara Server 5.2022.3 deserialization ConcurrentHashMap error. payara/Payara#6015

I'm not sure it's related, but j.u.c.CHM uses serialPersistentFields (with no real fields corresponding to elements of that array - this is different than for example j.u.Random (also sPF) which serializes fine).