Examples of jade.util.Logger

• jade.util.Logger
  This class provides a uniform API to produce logs over a set of different and device-dependent logging mechanisms. Different implementations of this class are provided according to the target environment (J2SE, pJava, MIDP), but all of them offer the same API. Finally the MIDP implementation redirects logging printouts on a MIDP RecordStore where they can be later inspected by means of the OutputViewer MIDlet distributed with the LEAP add-on.
  See also this tutorial for an overview of the JADE Logging Service.
  Logging levels can be used to control logging output. According to java logging philosophy, several logging levels can be set. The levels in descending order are:

  SEVERE (highest value)
  WARNING
  INFO
  CONFIG
  FINE
  FINER
  FINEST (lowest value)

  In addition, there is a level OFF that can be used to turn off logging, and a level ALL that can be used to enable logging of all messages.

  Notice that re-definition of logging levels was necessary in order to allow portability of calling code in PersonalJava e MIDP environments.

  For instance, in order to log the warning message "Attention!", the following code should be used, independently of the target device:
  
  Logger logger = Logger.getJADELogger(this.getClass().getName());
if (logger.isLoggable(logger.WARNING))
logger.log(Logger.WARNING,"Attention!");

  Notice that the test isLoggable allows just to improve performance, but it has no side-effect.

  J2SE
  The J2SE implementation is a pure extension of the java.util.logging.Logger class and it provides the whole set of functionalities of java.util.logging.

  In the J2SE environment, the logging configuration can be initialized by using a logging configuration file that will be read at startup. This file is in standard java.util.Properties format. The default logging configuration, that is part of the JRE distribution, can be overridden by setting the java.util.logging.config.file system property, like the following example:
  java -Djava.util.logging.config.file=mylogging.properties jade.Boot

  PersonaJava
  In the PJava implementation of the Logger class (available in the LEAP add-on) calls to the log() method result in calls to System.out.println(). Alternatively it is possible to redirect logging printouts to a text file by setting the -jade_util_Logger_logfile option. Note that, in order to face resource limitations, it is not possible to redirect logging printouts produced by different Logger objects to different files.

  MIDP
  In the MIDP implementation of the Logger class (available in the LEAP add-on) logging printouts are redirected to a MIDP RecordStore so that they can be later viewed by means of the jade.util.leap.OutputViewer MIDlet included in the LEAP add-on.
  
  The default level for logging is set to INFO, all messages of higher level will be logged by default. In MIDP and PJava the logging level for a Logger object registererd with name x.y.z can be configured by setting the configuration option x_y_z_loglevel to one of severe, warning, info, config, fine, finer, finest, all. See the LEAP user guide for details about how to set JADE configuration options in MIDP and PJava. @author Rosalba Bochicchio - TILAB @author Nicolas Lhuillier - Motorola (MIDP version)

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