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What is Logback marker?

SLF4J is a simple facade over various logging frameworks. For this example, we will be using logback as logger with SLF4J. Logback was conceived and created as a successor to Log4J. Logback supports markers for the logging calls. These Markers allow association of tags with log statements.

Markers. One of the primary purpose of a logging framework is to provide the means to generate debugging and diagnostic information only when it is needed, and to allow filtering of that information so that it does not overwhelm the system or the individuals who need to make use of it.

Logback is one of the most widely used logging frameworks in the Java Community. It’s a replacement for its predecessor, Log4j. Logback offers a faster implementation, provides more options for configuration, and more flexibility in archiving old log files.

A Mapped Diagnostic Context, or MDC in short, is an instrument for distinguishing interleaved log output from different sources. Log output is typically interleaved when a server handles multiple clients near-simultaneously. The MDC is managed on a per thread basis.

I have 2 logback.xml files in separate projects. One logs JDBC SQL to a file using a FileAppender and the other logs errors to stdout using a ConsoleAppender. Here are my logback.xml files for eac…

ERROR – a log level telling that an error, expected or unexpected, usually meaning that part of the system is not working properly. Logback appender is the component that Logback uses to write log events. They have their name and a single method that can process the event.

It’s also to make the long-term storage/warehousing of log data very difficult. That’s when rolling files come in handy. To address this well-known limitation, Logback provides the RollingFileAppender, which rolls over the log file when certain conditions are met.

A logger is a context for log messages. This is the class that applications interact with to create log messages. Appenders place log messages in their final destinations. A Logger can have more than one Appender. We generally think of Appenders as being attached to text files, but Logback is much more potent than that.