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Custom Appender

Create a custom appender to log events in a custom format by using log4j classes.

A custom appender can use any log4j appender class and you can specify multiple properties for the appender.

The built-in appenders have hidden properties that you cannot modify. A custom appender is an appender that either has a class that does not match a built-in appender class or a property that does not match the hidden properties of the built-in class. For example, the Rolling File appender has a hidden encoding property set to UTF-8. You can create a custom rolling file appender that has a different encoding property.

The following image shows a custom appender that uses the console appender class: