[GitHub] [logging-log4j2] abysas commented on issue #223: [LOG4J2-2476] missing classes for 1.2 compatibility

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abysas commented on issue #223: [LOG4J2-2476] missing classes for 1.2 compatibility
URL: https://github.com/apache/logging-log4j2/pull/223#issuecomment-482317370
 
 
   @rgoers, thank you for confirming about the compatibility mismatch. I was so happy seeing the v2.11.2 release notes about added `ConsoleAppender`. The [migration guide ](https://logging.apache.org/log4j/2.x/manual/migration.html) from Log4j 1.x clearly indicates that applications that want to successfully use `log4j-1.2-api.jar` bridge to replace Log4j, the application:
   
   > ... must not access methods and classes internal to the Log4j 1.x implementation such as **Appenders**, LoggerRepository or Category's callAppenders method.
   
   Based on this clear limitation, I didn't tried to suggest a replacement for `ConsoleAppender` in Log4j2 bridge. We have a 3rd party application, which use Log4j and instantiates `ConsoleAppender` with specific `Layout` supplied in constructor. To support this application along with Log4j2 bridge, in my project I added custom `ConsoleAppender` having the same package as original one of v1.2. 
   
   And to my dismay the added `ConsoleAppender` in v2.11.2 is incompatible with the original class - it breaks the workaround, as added incompatible  `ConsoleAppender` clashes with v1.2 compatible  `ConsoleAppender` I've added.
   
   It becomes a blocker to us to upgrade to the Log4j2 v2.11.2+ version.

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