Volkan, 

See https://issues.apache.org/jira/browse/LOG4J2-1648 for more details. 

Remko.

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> On Nov 3, 2019, at 13:57, Ralph Goers <ralph.go...@dslextreme.com> wrote:
> 
> No. Our experience has shown that putting non-String values in ThreadLocals 
> has to be done very carefully, so to make sure there aren’t any problems the 
> ThreadContextMap only allows Strings.
> 
> Ralph
> 
>> On Nov 2, 2019, at 1:11 PM, Volkan Yazıcı <volkan.yaz...@gmail.com> wrote:
>> 
>> Hello,
>> 
>> LogEvent#getContextData() returns a ReadOnlyStringMap such that the
>> provided get() and forEach() allow non-String values in the entries. That
>> said, ReadOnlyStringMap#toMap() returns a Map<String, String>. Further,
>> both ThreadContext.put() and ThreadContext.putAll() only allow String
>> values. I am confused by this inconsistency. Is there a way to provide an
>> MDC entry where the value is of a non-String type?
>> 
>> Best.
> 
> 
> 
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