ConcurrentModificationException thrown on RedissonSession save method about redisson HOT 7 CLOSED

It's a Kryo lib issue.

@theigl

Hi. Can you look at it?

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This is most likely not a Kryo issue. It looks like the Kryo encoder is given an ArrayList that is modified concurrently by another thread. Kryo always assumes it has exclusive access to the data during serialization. The user of Kryo has to make sure that the data can be safely serialized.

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@theigl

Thank you for review. Let me check that.

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@theigl

map passed into createPutAllMessage isn't changed since it's life scope is createPutAllMessage method. You can check org.redisson.tomcat.RedissonSession.save() method.

from redisson.

Kryo does not write/remove data from lists so it can't be responsible for the exception. An other thread must access the list at the same time. If you look closely the stacktrace, the error happens in ArrayList, not in a map. So there must be a list somewhere in the map that gets modified.

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You are right. User stores list as Tomcat Session attribute.

from redisson.

Fixed. Thanks for report

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