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| <h1 class="page">Logging in Apache James</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="admonitionblock note"> |
| <table> |
| <tr> |
| <td class="icon"> |
| <i class="fa icon-note" title="Note"></i> |
| </td> |
| <td class="content"> |
| This information targets developers. |
| </td> |
| </tr> |
| </table> |
| </div> |
| <div class="paragraph"> |
| <p>Logging is very important when running a software. |
| Most of the time people use logs for debugging and troubleshooting issues in production. |
| In Apache James we leverage a logging facade for logging <a href="http://www.slf4j.org/">Slf4j</a> . |
| Please see the documentation for exact details.</p> |
| </div> |
| <div class="paragraph"> |
| <p>In a typical application logs are stored for a specific period. |
| This can be 1 day, 1 week, etc.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Some other typical scenarios include:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p>Rotating logs periodically.</p> |
| </li> |
| <li> |
| <p>Shipping logs centrally.</p> |
| </li> |
| <li> |
| <p>Saving some logging messages to other files / end devices</p> |
| </li> |
| </ul> |
| </div> |
| <div class="paragraph"> |
| <p>By leveraging a logging facade like Slf4j, the end user has the ability to use different logging back ends and achieve the above requirements.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Logging is something we do to help the people running our code. |
| We also help ourselves when they encounter bugs, and they need to share information with us for a fix. |
| As developers, we should be mindful of the logging statements. |
| We should also be mindful about the performance implications of logging and not abuse it.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="_loggers_used_in_code"><a class="anchor" href="#_loggers_used_in_code"></a>Loggers used in code</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>You can define a logger using a string or a class. |
| For common loggers it’s ok to use a string name.</p> |
| </div> |
| <div class="listingblock"> |
| <div class="content"> |
| <pre class="highlightjs highlight"><code class="language-java hljs" data-lang="java"> private static final Logger LOGGER = LoggerFactory.getLogger("org.apache.james.CONFIGURATION"); |
| private static final Logger LOGGER = LoggerFactory.getLogger(JamesServerMain.class);</code></pre> |
| </div> |
| </div> |
| <div class="paragraph"> |
| <p>Loggers can be hierarchical. |
| This helps when we build a logger from a class name, and we use package structure to drive the logger hierarchy.</p> |
| </div> |
| <div class="paragraph"> |
| <p>The most useful loggers should to be documented below. |
| Please maintain this list of loggers.</p> |
| </div> |
| <div class="dlist"> |
| <dl> |
| <dt class="hdlist1">org.apache.james.CONFIGURATION</dt> |
| <dd> |
| <p>It is used to log events related to configuration loading and updating.</p> |
| </dd> |
| </dl> |
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