When a value doesn’t exist and you don’t specify a default value then the value
of the variable string is itself. So If you code ${ctx:ndc} and there is no
value for that you will see ${ctx:ndc} in the output. Whenever StrSubstitutor
finds a variable of the form $${ctx:ndc} it will simply strip the leading $ and
you will get ${ctx:ndc}.
Ralph
> On Feb 20, 2020, at 12:37 PM, Surendar Chandra <[email protected]>
> wrote:
>
> I'm building a JSON log by using something like this in my xml config:
>
> <KeyValuePair key="ndc" value="$${ctx:ndc}"/>
>
> If I use a single $, for one particular value, the value seems to be
> stuck at a constant. Other variables are fine. If I use a double $,
> then it seems to work in all scenarios. I guess I should be using $$
> but why is it flaky with a single $. Documentation states "During
> initial configuration processing the first '$' will be removed.". In
> that case I'd expect it to be {ctx:ndc} and not some other string.
>
> Thanks
>
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