Version 2.10.0 added the module log4j-appserver to improve integration with Apache Tomcat and Eclipse Jetty. This reduces pressure on the garbage collector and can give better response time performance. Garbage-freeĭuring steady state logging, Log4j 2 is garbage-free in stand-alone applications, and low In addition to using one of the many log methods in the Log4j API, log events can be constructed using a builder. In Log4j 2, custom log levels can easily be defined in code or in configuration. Level is not enabled, the same effect can be achieved with less code. Since Log4j will not evaluate a lambda expression if the requested log Client code running on Java 8 can benefit from Log4j's Previously, if a log message was expensive to construct, you would often explicitly check if the requested log level isĮnabled before constructing the message. Users can furtherĬustomize the property providers by adding their own Lookup Plugin. System properties, environment variables, the ThreadContext Map, and data present in the event. Properties come from values defined in the configuration file, Underlying component that will dynamically resolve them. You can reference properties in a configuration, Log4j will directly replace them, or Log4j will pass them to an Log4j automatically recognizes plugins and uses them when aĬonfiguration references them. As such, you do not need to write code to create and configure anĪppender, Layout, Pattern Converter, and so on. Log4j uses the plugin pattern to configure components. Unlike Logback, you can use a common Filter class In addition, filters can also be associated with Loggers. Filtering can be specified to apply to all events before being passed to Loggers or as they pass throughĪppenders. Like Logback, Log4j 2 supports filtering based on context data, markers, regular expressions, and other components in Without losing log events while reconfiguration is taking place. Like Logback, Log4j 2 can automatically reload its configuration upon modification. Implementation with the log4j-to-slf4j adapter. Avoid lock-inĪpplications coded to the Log4j 2 API always have the option to use any SLF4J-compliant library as their logger While the Log4j 2 API will provide the best performance, Log4j 2 provides support for the Log4j 1.2, SLF4J, Commons Outperforms Log4j 1.x, Logback and, especially in multi-threaded applications. See Asynchronous Logging Performance for details. In multi-threaded scenariosĪsynchronous Loggers have 18 times higher throughput and orders of magnitude lower latency than Log4j 1.x and Logback. Log4j 2 contains next-generation Asynchronous Loggers based on the LMAX Disruptor library.
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