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Log formatters

Log formatters format log messages so they can be used by various log handlers.

Handlers can be configured with a log formatter that knows how to format log records. The event, which is represented by the log record object, is passed to the appropriate formatter by the handler. The formatter returns formatted output to the handler, which writes the output to the output device.

The formatter is responsible for rendering the event for output. This formatter uses the resource bundle specified in the event to look up the message in the appropriate language.

Formatters are attached to handlers using the setFormatter method.

(dist) With WebSphere Application Server, we can configure the formatter to work with trace, the SystemOut.log, and theSystemErr.log log files:

(iseries)(dist) We can select a formatter for a handler using the console panels. See Diagnostic trace service settings for details.

We can find the java.util.logging documentation at http://java.sun.com/javase/.

This topic references one or more of the application server log files. As a recommended alternative, we can configure the server to use the High Performance Extensible Logging (HPEL) log and trace infrastructure instead of using SystemOut.log , SystemErr.log, trace.log, and activity.log files on distributed and IBM i systems. We can also use HPEL in conjunction with the native z/OS logging facilities. If we are using HPEL, we can access all of the log and trace information using the LogViewer command-line tool from the server profile bin directory. See the information about using HPEL to troubleshoot applications for more information on using HPEL.


Related concepts

  • Loggers
  • Log handlers
  • Log filters


    Related tasks

  • Use High Performance Extensible Logging to troubleshoot applications

    (iseries)(dist) Diagnostic trace service settings

  • Log levels