How to properly create a RollingFileAppender with AppenderComponentBuilder in log4j 2

Question

I would like the user to choose the type of the appender(s) that will be created via a configurable option.

For example, let\'s say that I have a command line argum

Answer 1

1. Yes, this is the intended way to programmatically create a new configuration.

2. Here is an example of how to create a rolling file appender. Since Appenders can be configured with arbitrary components you use the generic ComponentBuilder to specify those plugins.

   ConfigurationBuilder< BuiltConfiguration > builder =
           ConfigurationBuilderFactory.newConfigurationBuilder();
   
   builder.setStatusLevel( Level.ERROR);
   builder.setConfigurationName("RollingBuilder");
   // create the console appender
   AppenderComponentBuilder appenderBuilder = builder.newAppender("Stdout", "CONSOLE").addAttribute("target",
           ConsoleAppender.Target.SYSTEM_OUT);
   appenderBuilder.add(builder.newLayout("PatternLayout").
           addAttribute("pattern", "%d [%t] %-5level: %msg%n%throwable"));
   builder.add( appenderBuilder );
   
   LayoutComponentBuilder layoutBuilder = builder.newLayout("PatternLayout")
           .addAttribute("pattern", "%d [%t] %-5level: %msg%n");
   ComponentBuilder triggeringPolicy = builder.newComponent("Policies")
           .addComponent(builder.newComponent("CronTriggeringPolicy").addAttribute("schedule", "0 0 0 * * ?"))
           .addComponent(builder.newComponent("SizeBasedTriggeringPolicy").addAttribute("size", "100M"));
   appenderBuilder = builder.newAppender("rolling", "RollingFile")
           .addAttribute("fileName", "target/rolling.log")
           .addAttribute("filePattern", "target/archive/rolling-%d{MM-dd-yy}.log.gz")
           .add(layoutBuilder)
           .addComponent(triggeringPolicy);
   builder.add(appenderBuilder);
   
   // create the new logger
   builder.add( builder.newLogger( "TestLogger", Level.DEBUG )
           .add( builder.newAppenderRef( "rolling" ) )
           .addAttribute( "additivity", false ) );
   
   builder.add( builder.newRootLogger( Level.DEBUG )
           .add( builder.newAppenderRef( "rolling" ) ) );
   Configurator.initialize(builder.build());