Comments below. > On Mar 29, 2022, at 3:01 PM, Pablo Rogina <pabl...@gmail.com> wrote: > > Ralph, thank you for your reply. > >> To be usable in your configuration a Log4j 1.2 Appender cannot be a Log4j2 >> plugin. > Ok. It is not, as my CustomAppender extends RollingFileAppender (from > Log4j v 1.2.x) > >> You would configure it exactly as you do in log4j 1.x, via its class name. > Ok. I think it's what I'm doing. > This is the properties I'm using to configure my app logging: > log4j.appender.MYAPPLOGFILE=com.mycompany.log4j.CustomAppender > log4j.appender.MYAPPLOGFILE.Append=false > log4j.appender.MYAPPLOGFILE.SpecialValue=ABC > log4j.appender.MYAPPLOGFILE.HeaderVersion=1 > log4j.appender.MYAPPLOGFILE.File=logs/MyApp.log > log4j.appender.MYAPPLOGFILE.MaxBackupIndex=19 > log4j.appender.MYAPPLOGFILE.MaxFileSize=2000KB > log4j.appender.MYAPPLOGFILE.layout=org.apache.log4j.PatternLayout > log4j.appender.MYAPPLOGFILE.layout.ConversionPattern=%d{[dd MMM yyyy > HH\:mm\:ss,SSS]}[%t]\:%-5p\:%l -->%m%n > log4j.rootLogger=INFO, MYAPPLOGFILE
For this can you run your application with -Dlog4j2.debug=true? I’d like to see what is happening. > >> That said, Do you really need your custom RollingFileAppender? The >> RollingFileAppender >> in Log4j 2 has many more options than Log4j 1 did. > > Well, I also have a CustomAppender for Log4j 2 that resembles a > RollingFileAppender, defined like this: > > @Plugin(name = CustomAppender.PLUGIN_NAME, category = > Core.CATEGORY_NAME, elementType = Appender.ELEMENT_TYPE, printObject = > true) > public final class CustomAppender extends > AbstractOutputStreamAppender<RollingFileManager> { > ... > > however I also got the "Unable to load plugin class name ..." issue if > using the CustomAppender v2. > And I also find difficult to configure it via Properties using the > Log4j 1.2 Bridge Yes, that is understandable. The problem is that the Log4j 1 support cannot directly deal with a Log4j 2 Appender. It has to wrap it to make it look like a Log4j 1 Appender. So you could either create your own Builder that is similar to the other AppenderBuilders or you can define your custom Log4j.2 Appender in its own Log4j 2 configuration file and then merge it with your Log4j 1 configuration as a composite configuration - see https://logging.apache.org/log4j/2.x/manual/configuration.html#CompositeConfiguration <https://logging.apache.org/log4j/2.x/manual/configuration.html#CompositeConfiguration>. Ralph