Examples of org.apache.log4j.Logger.error()

org.apache.log4j.Logger.error()
Log a message with the ERROR level with message formatting done according to the messagePattern and the arguments arg1 and arg2.
This form avoids superflous parameter construction. Whenever possible, you should use this form instead of constructing the message parameter using string concatenation. @param messagePattern The message pattern which will be parsed and formatted @param arg1 The first argument to replace the first formatting element @param arg2 The second argument to replace the second formatting element @since 1.3


    log4jLogger.trace("msg" +(n++));
    log4jLogger.debug("msg" +(n++));
    log4jLogger.info("msg" +(n++));
    log4jLogger.warn("msg" +(n++));
    log4jLogger.error("msg" +(n++));
    log4jLogger.fatal("msg" +(n++));
    
    log4jCategory.debug("msg" +(n++));
    log4jCategory.info("msg" +(n++));
    log4jCategory.warn("msg" +(n++));

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    Logger l = Logger.getLogger("a");
    l.trace("t");
    l.debug("d");
    l.info("i");
    l.warn("w");
    l.error("e");
    l.fatal("f");


    Exception e = new Exception("testing");
    l.trace("t", e);
    l.debug("d", e);

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    Exception e = new Exception("testing");
    l.trace("t", e);
    l.debug("d", e);
    l.info("i", e);
    l.warn("w", e);
    l.error("e", e);
    l.fatal("f", e);
  }


}

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    myLogger.setLevel(Level.INFO);
    
    // log a fatal event 
    myLogger.info("info: I have died of thirst");
    myLogger.warn("warn: I have died of thirst");
    myLogger.error("error: I have died of thirst");
    myLogger.fatal("fatal: I have died of thirst");


  }
}

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    if(observer != null) {
      addObserver(observer);     
    } else {
      // log it.
      final Logger logger = Logger.getLogger(Registrator.class);
      logger.error("null observer was not added.", new Throwable());
    }
  }


  /**
   * remove observer from observers list.

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      Logger l = Logger.getRootLogger();
      l.addAppender(appender);
      if (ex == null) {
        l.info(msg);
      } else {
        l.error(msg, ex);
      }
      appender.close();
      String[] retval = new String[packets];
      byte[] buf = new byte[1000];
      for(int i = 0; i < packets; i++) {

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    Logger logger = Logger.getLogger("test");
    logger.trace(msg);
    logger.debug(msg);
    logger.info(msg);
    logger.warn(msg);
    logger.error(msg);
    logger.fatal(msg);
  }


  public static Test suite() {
    TestSuite suite = new TestSuite();

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    logger.warn("Message " + ++i);
    logger.log(XLevel.LETHAL, "Message " + ++i); //5
    
    Exception e = new Exception("Just testing");
    logger.debug("Message " + ++i, e);
    root.error("Message " + ++i, e);
    NDC.pop();
    MDC.remove(key);


    Thread.currentThread().setName(oldThreadName);
  }

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    Logger logger = Logger.getLogger("org.apache.log4j.nt.NTEventLogAppenderTest");
    int i  = 0;
    logger.debug( "Message " + i++);
    logger.info( "Message " + i++);
    logger.warn( "Message " + i++);
    logger.error( "Message " + i++);
    logger.log(Level.FATAL, "Message " + i++);
    logger.debug("Message " + i++,  new Exception("Just testing."));
  }
}

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            } else if (Level.INFO == level) {
                logger.info(message, t);
            } else if (Level.WARN == level) {
                logger.warn(message, t);
            } else if (Level.ERROR == level) {
                logger.error(message, t);
            } else if (Level.FATAL == level) {
                logger.fatal(message, t);
            }
        }
    }

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