Hi Stig,
On Fri, 18 Nov 2022 at 11:03, Stig Døssing
<stig.doess...@crowdstrike.com.invalid> wrote:
> Is there a way to disable this “permanent substitution” and get log4j to do
> the system property lookup for every log event, even if there is a default
> value? If not, should there be? System properties can be changed from inside
> the application, so it seems strange to assume that if a system property has
> a value during logging init, it will keep that same value permanently.
The `${...}` placeholders are replaced at configure time. If no value
is available, they are left as is (this is IMHO a bug).
If you want to evaluate the lookup at each logging event, just escape
the dollar sign: `$${sys:testProperty}`. At configuration time one
dollar sign will be stripped, so that the lookup will be performed at
every logging event.
Piotr
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