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| <li id="publishDate">Last Published: 2012-06-09</li> |
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| <div class="section"><h2>About Log4j 2<a name="About_Log4j_2"></a></h2> |
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| <p> |
| Log4j 2 is an upgrade to Log4j that provides significant improvements over its predecessor, Log4j |
| 1.x, and provides many of the improvements available in Logback while fixing some inherent problems in |
| Logback's architecture. |
| </p> |
| |
| <p>Some of the features and improvements in Log4j 2 are:</p> |
| |
| <div class="section"><h3>API Separation<a name="API_Separation"></a></h3> |
| <p> |
| The API for Log4j is separate from the implementation. It is now clear to application developers |
| what classes and methods they can use with compatibility being assured while allowing |
| improvements to be made to the implementation. |
| </p> |
| </div><div class="section"><h3>Improved Performance<a name="Improved_Performance"></a></h3> |
| <p> |
| Faster performance than Log4j 1.x in critical areas and similar performance to Logback in |
| most circumstances. See <a href="performance.html">Performance</a> for more information. |
| </p> |
| </div><div class="section"><h3>Support for multiple APIs<a name="Support_for_multiple_APIs"></a></h3> |
| <p> |
| While the Log4j 2 API will provide the best performance, support for the SL4J and Commons Logging |
| APIs are provided. |
| </p> |
| </div><div class="section"><h3>Automatic Reloading of Configurations<a name="Automatic_Reloading_of_Configurations"></a></h3> |
| <p> |
| Like Logback, Log4j 2 can automatically reload its configuration upon modification. Unlike Logback, |
| it will do so without losing log events while reconfiguration is taking place. |
| </p> |
| </div><div class="section"><h3>Advanced Filtering<a name="Advanced_Filtering"></a></h3> |
| <p> |
| Like Logback, Log4j 2 supports filtering based on context data, markers, regular expressions and |
| other components in the Log event and can be specified to apply to all events before being passed |
| to Loggers or as they pass through appenders. In addition, filters can also be associated with |
| Loggers. Unlike Logback, a common Filter class can be used in any of these circumstances. |
| </p> |
| </div><div class="section"><h3>Plugin Architecture<a name="Plugin_Architecture"></a></h3> |
| <p> |
| All configurable components are defined as Log4j plugins. As such, no Log4j code must be changed to |
| create a new Appender, Layout, Pattern Converter, etc. Log4j will automatically |
| recognize properly defined plugins and use them when they are referenced in the configuration. |
| </p> |
| </div><div class="section"><h3>Property Support<a name="Property_Support"></a></h3> |
| <p> |
| Properties can be referenced in the configuration and either be directly replace or passed to the |
| underlying component where they can be dynamically resolved. Properties can come from values |
| defined in the configuration file, system properties, environment variables, the ThreadContext |
| Map, and data present in the event. Users can further customize the property providers by |
| adding their own <a href="../lookups.html">Lookup</a> Plugin. |
| </p> |
| |
| </div></div> |
| |
| <div class="section"><h2>Requirements<a name="Requirements"></a></h2> |
| <p> |
| Log4j 2 requires Java 5 but has will take advantage of enhancements in Java 6 to improve performance. |
| Some features may require optional dependencies. These dependencies are |
| specified in the documentation for those features. |
| </p> |
| </div> |
| |
| <div class="section"><h2>News<a name="News"></a></h2> |
| <p> |
| Log4j 2 is now available for testing. The API for Log4j 2 is not compatible with Log4j 1.x, however an adapter |
| is available to allow applications to continue to use the Log4j 1.x API. Adapters are also available for |
| Commons Logging and SLF4J. |
| </p> |
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