log4j2

I am not able to decide whether to use slf4j or not with log4j2. Based on online posts, does not look like it will have any performance hit but is it really required. Also these points rule in favor of log4j2: SLF4J forces your application to log Strings. The Log4j 2 API supports logging any CharSequence if you want to log text, but also supports logging any Object as is. The Log4j 2 API offers support for logging Message objects, Java 8 lambda expressions and garbage-free logging (it avoids creating vararg arrays and avoids creating Strings when logging CharSequence objects). Remko Popma Go

We use log4j 1.2.x for logging in our product and are looking to migrate to log4j 2.x in near future. One of the functionality we have implemented is to log the system information and other important parameters on every new roll-over logfile that gets generated. The way we implemented in log4j 1.2.x is that we have extended RollingFileAppender class of log4j and have overridden the rollOver() method, below is the part snippet of the implementation @Override public void rollOver() { super.rollOver(); //We are not modifying it's default functionality but as soon as rollOver happens we apply our

一、Log4j2日志简介 日志打印是了解Web项目运行的最直接方式，所以在项目开发中是需要首先搭建好的环境。 1、Log4j2特点 1）核心特点 相比与其他的日志系统，log4j2丢数据这种情况少；disruptor技术，在多线程环境下，性能高；并发的特性，减少了死锁的发生。 2）性能测试 2、日志打印之外观模式 每一种日志框架都有自己单独的API，要使用对应的框架就要使用其对应的API，增加应用程序代码和日志框架的耦合性。 《阿里巴巴Java开发手册》，其中有一条规范做了『强制』要求： SLF4J Java简易日志门面（Simple Logging Facade for Java，缩写SLF4J），是一套包装Logging 框架的界面程式，以外观模式实现。 二、配置日志打印 1、项目结构 2、不同环境的日志配置 使用最直接的方式，不同环境加载不同的日志配置。 1)开发环境配置 logging: config: classpath:log4j2-boot-dev.xml 2)生产环境配置 logging: config: classpath:log4j2-boot-pro.xml 3、Log4j2的配置文件 <?xml version="1.0" encoding="UTF-8"?> <!--monitorInterval：Log4j2 自动检测修改配置文件和重新配置本身

As disscussed in this link : How to create a own Appender in log4j? For creating a custom appender in log4j 1.x we have to extend the AppenderSkeleton class and implements its append method. Similarly How we can create a custom appender in log4j2 as we dont have AppenderSkelton class to extend and all other appender extend AppenderBase class . This works quite differently in log4j2 than in log4j-1.2. In log4j2, you would create a plugin for this. The manual has an explanation with an example for a custom appender here: http://logging.apache.org/log4j/2.x/manual/extending.html#Appenders It may