[GitHub] [logging-log4j2] ppkarwasz commented on issue #1227: ERROR No appender references provided to AsyncAppender: appenderRefs

["ppkarwasz (via GitHub)" <gi...@apache.org>]

ppkarwasz commented on issue #1227:
URL: https://github.com/apache/logging-log4j2/issues/1227#issuecomment-1405572159

   @virajjasani,
   
   Try:
   
   ```
   appender.ASYA.$0.type = AppenderRef
   appender.ASYA.$0.ref = DRFA
   ```
   
   You chose probably the worst configuration format available. Log4j2 configuration is hierarchical, which can not be said of the properties format. The properties format basically follows these rules:
   
    * all properties and subcomponents of a Log4j2 component have the same prefix (in your case `appender.ASYA` for the asynchronous appender),
    * simple properties are specified as `prefix.property_name` (e.g. `appender.ASYA.blocking`),
    * subcomponents have a prefix of `parent_prefix.unique_id` (in my example `appender.ASYA.$0`), must have a `type` property (`appender.ASYA.$0.type = AppenderRef` in the example) and then you specify the subcomponent's properties as in the previous points.
   
   **Remark:** some subcomponents, such as layouts or filters have a hardcoded unique id.
   


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