carterkozak commented on pull request #573:
URL: https://github.com/apache/logging-log4j2/pull/573#issuecomment-924095311


   Sorry, Ralph. I've updated this branch with a fix. I'm going to PR something 
into the release branch separately to improve messaging/behavior in that case 
because it's a little spooky.
   
   `.core.appender.rolling.PatternProcessor` parses patterns and executes 
(simplified):
   ```java
   List<PatternConverter> parsed = ...;
   ArrayPatternConverter[] converters = parsed.toArray(new 
ArrayPatternConverter[0]);
   ```
   
   Calling `toArray(subtype)` succeeds based on runtime type info, however it 
requires all subtypes to implement ArrrayPatternConverter. I think we should 
either:
   1. Fail loudly and eagerly with an error message that states the 
ArrayPatternConverter requirement and the type of the invalid converter
   2. Allow non-array converters, but pass a null value.


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