doc/examples/java-log4j2-basic/HelloLog4j2.java

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright (C) 2022 EfficiOS Inc.
   5  */
   6
   7 import org.apache.logging.log4j.LogManager;
   8 import org.apache.logging.log4j.Logger;
   9
  10 /**
  11  * Example application using the LTTng-UST Java log4j agent.
  12  *
  13  * <p>
  14  * To obtain LTTng trace events, you should run the following sequence of
  15  * commands:
  16  * </p>
  17  *
  18  * <ul>
  19  * <li>$ lttng create</li>
  20  * <li>$ lttng enable-event -l -a</li>
  21  * <li>$ lttng start</li>
  22  * <li>(run this program)</li>
  23  * <li>$ lttng stop</li>
  24  * <li>$ lttng view</li>
  25  * <li>$ lttng destroy</li>
  26  * </ul>
  27  *
  28  */
  29 public class HelloLog4j2 {
  30
  31         private static final Logger logger = LogManager.getLogger(HelloLog4j2.class);
  32
  33         /**
  34          * Application start
  35          *
  36          * @param args Command-line arguments
  37          */
  38         public static void main(String args[]) {
  39
  40                 /* Trigger some tracing events using the Log4j Logger created before. */
  41                 logger.info("Basic config: Hello World, the answer is " + 42);
  42                 logger.info("Basic config: Another info event");
  43                 logger.error("Basic config: An error event");
  44         }
  45 }