I have this pattern and it's working :

<pattern>%d{HH:mm:ss} %-5p [%t] [%c{1}] [%X{amtrac.serviceName}] [%X{amtrac.method}] [%X{amtrac.clientProcessName}] [%X{identity_user_context_guid}] [%X{identity_user_context_username}] [%X{identity_user_context_partner_id}] [%X{amtrac.tx}] MESSAGE=[%m]%n</pattern>

However, I would like to replace a NULL if any of the MDC is null as a default value so...

<pattern>%d{HH:mm:ss} %-5p [%t] [%c{1}] [%X{amtrac.serviceName:-NULL}] [%X{amtrac.method:-NULL}] [%X{amtrac.clientProcessName:-NULL}] [%X{identity_user_context_guid:-NULL}] [%X{identity_user_context_username}] [%X{identity_user_context_partner_id}] [%X{amtrac.tx}] MESSAGE=[%m]%n</pattern>

I tried it but it seems like it totally stops logging anything.

Thanks in advance!
-Amit Mohan