StackOverflow2013

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copied!<p>If you are using Java Logging API and if you have a java class like the next:</p> <pre><code>import java.util.logging.Level; import static java.util.logging.Level.*; import java.util.logging.Logger; public class Main { private static final Logger LOG = Logger.getLogger(Main.class.getName()); public static void main(String[] args) { Level[] levels = { OFF, SEVERE, WARNING, INFO, CONFIG, FINE, FINER, FINEST, ALL }; for (Level level : levels) { LOG.setLevel(level); LOG.log(level, "Hello Logger"); } } } </code></pre> <p>You notice that the output is:</p> <pre><code>Jun 7, 2013 6:30:16 PM Main main SEVERE: Hello Logger Jun 7, 2013 6:30:16 PM Main main WARNING: Hello Logger Jun 7, 2013 6:30:16 PM Main main INFO: Hello Logger </code></pre> <p>What happens? What about the other levels? What am I doing wrong? Don't worry. Be happy! This is because the default level for Java Logging API is <code>INFO</code>. You can find this in the configuration file <code>logging.properties</code> in the JRE, e.g. </p> <pre><code>D:\Software\jdk1.6.0_43\jre\lib\logging.properties </code></pre> <p>In this file, we can see the lines:</p> <pre><code># Default global logging level. # This specifies which kinds of events are logged across # all loggers. For any given facility this global level # can be overriden by a facility specific level # Note that the ConsoleHandler also has a separate level # setting to limit messages printed to the console. .level= INFO </code></pre> <p>And, as the text indicates, the level for the console handler:</p> <pre><code># Limit the message that are printed on the console to INFO and above. java.util.logging.ConsoleHandler.level = INFO </code></pre> <p>This is the reason why the maximum level of detail in the output is <code>INFO</code>. You can change the level in this file or in your code (this is best to not affect the level of other processes), e.g.:</p> <pre><code>import java.util.logging.ConsoleHandler; import java.util.logging.Handler; import java.util.logging.Level; import static java.util.logging.Level.*; import java.util.logging.Logger; public class Main { private static final Logger LOG = Logger.getLogger(Main.class.getName()); public static void main(String[] args) { Level[] levels = { OFF, SEVERE, WARNING, INFO, CONFIG, FINE, FINER, FINEST, ALL }; Logger root = Logger.getLogger(""); // .level= ALL root.setLevel(ALL); for (Handler handler : root.getHandlers()) { if (handler instanceof ConsoleHandler) { // java.util.logging.ConsoleHandler.level = ALL handler.setLevel(ALL); } } for (Level level : levels) { LOG.setLevel(level); LOG.log(level, "Hello Logger"); } } } </code></pre> <p>The output for the last code is:</p> <pre><code>Jun 7, 2013 6:31:13 PM Main main SEVERE: Hello Logger Jun 7, 2013 6:31:13 PM Main main WARNING: Hello Logger Jun 7, 2013 6:31:13 PM Main main INFO: Hello Logger Jun 7, 2013 6:31:13 PM Main main CONFIG: Hello Logger Jun 7, 2013 6:31:13 PM Main main FINE: Hello Logger Jun 7, 2013 6:31:13 PM Main main FINER: Hello Logger Jun 7, 2013 6:31:13 PM Main main FINEST: Hello Logger Jun 7, 2013 6:31:13 PM Main main ALL: Hello Logger </code></pre> <p><strong>EDIT</strong></p> <p>You can also use another file <code>logging.properties</code> whith the desired level adding an argument to the virtual machine:</p> <pre><code>-Djava.util.logging.config.file="C:\mylogging.properties" </code></pre>

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