Log4j has been around for a while now, and it seems like so many applications use it. I've used it in my applications for years now, and I'll bet you have too. But every time I need to do something with log4j I've never done before I find myself searching for examples of how to do whatever that is, and I don't usually have much luck. I believe the reason for this is that there is a not a great deal of useful information about log4j, either in print or on the Internet. The information is too simple to be of real-world use, too complicated to be distilled quickly (which is what most developers want) and/or not very well written and hard to understand. The purpose of this Short Cut is to hit the "sweet spot" that no other works currently do: the right balance between simplicity and useful information.

The code for this Short Cut is available at the code example repository.

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Spis treści

Log4J eBook -- spis treści

• Log4J
  • A Note Regarding Supplemental Files
  • Introduction
  • About the Example Application
  • Configuring and Using Log4j
    • Log4J Concepts
      • Configuration
      • loggers
      • Obtaining a logger instance
      • Configuring a logger
      • The Root logger
      • Appenders
      • Layouts
    • Working with Configuration Files
      • The Log4j configuration sequence
      • Properties file
      • XML file
    • Working with Loggers
    • Working with Appenders
      • What is an appender?
      • Appender inheritance
      • Appender threshold levels
      • Appender reference
    • Working with Layouts
  • Applications of Log4J with Use Cases
    • Decouple an Object from its Logged Form
      • Problem
      • Solution
    • Sending Log Messages to the Outside World
      • Problem
      • Solution
    • Logging to Multiple Destinations
      • Problem
      • Solution
    • Content-Based Logging
      • Problem
      • Solution
    • Logging Messages to a Database
      • Problem
      • Solution
    • Segregating Output
      • Problem
      • Solution
    • Special Messages
      • Problem
      • Solution
  • Conclusion
  • About the Author