Github user remkop commented on the issue:
https://github.com/apache/logging-log4j2/pull/78
The serialVersionUID can remain unchanged if
* the new version of the software can deserialize "old" serialized objects
(backwards compatible)
* the "old" version of the software can deserialize "new" serialized
objects (forward compatible)
Sometimes it's okay to keep the serialVersionUID unchanged if the change is
backwards compatible but not forward compatible. That allows new versions of
Log4j2 to read old serialized logs.
This needs to be clearly documented.
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