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https://issues.apache.org/jira/browse/LOG4J2-1347?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15260501#comment-15260501
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Mikael Ståldal commented on LOG4J2-1347:
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I have started some work to get rid of the (IMHO) misuse of serialization of 
{{LogEvent}}. I think we should use the memento pattern more consistently 
instead.

Check branch LOG4J2-1347. It still uses serialization, but now it is 
encapsulated. Next step is to implement the new {{createMemento()}} methods 
more efficiently.

> AsyncAppender - Allow serialization of custom LogEvents
> -------------------------------------------------------
>
>                 Key: LOG4J2-1347
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1347
>             Project: Log4j 2
>          Issue Type: Improvement
>            Reporter: John Strickler
>            Priority: Minor
>
> This request is for an improvement to AsyncAppender to allow sublasses of 
> Log4jLogEvent to be serialized without losing their specific type.
> The current functionality is that AsyncAppender will serialize all subclasses 
> back to a true instance of Log4jLogEvent.  In the process, all extra 
> information is lost that was provided by the subclass.
> _AsyncAppender, line 156:_
> bq. final Serializable serialized = Log4jLogEvent.serialize(coreEvent, 
> includeLocation);
> *Use Case*
> Subclasses of Log4jLogEvent that contain the authenticated principal to be 
> logged.



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