log4j2

I currently am starting a new Webapp (running on tomcat 6) I have components using slf4j and components using commons logging I plan to use log4j 2.0 as log implementation due to several reasons (mainly for the appenders:SocketAppender and SyslogAppender but also because of the promoted config reloading without loss of log events) Now my questions are: - To which interface do I program my new classes? loag4j or slf4j? or even commons logging? What's the preferred way to deploy the jars? put them in my application war or do i put them into the tomcat libs? what jars do I need to deploy? log4j

We would like to use Log4j2 as the log binding with grails 3. From what I can figure out so far. We have many subordinate dependencies that use a variety of loggers, so we need to use the SLF4J API. Then, instead of letting grails / groovy / spring re-direct the SLF4J API to the Logback binding, we need to re-direct each to the Log4j2 binding. Since grails 3 uses the Logback binding, I am planning to go through each dependency in the build.gradle, exclude the Logback binding, and include the Log4j2 binding. Will this work? Update: Yes Do we also need to bridge the Log4j2 API to the SLF4j API?

The documentation for log4j2 configuration provides a nice sample XML document equivalent to the default configuration: <?xml version="1.0" encoding="UTF-8"?> <Configuration status="WARN"> <Appenders> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/> </Console> </Appenders> <Loggers> <Root level="error"> <AppenderRef ref="Console"/> </Root> </Loggers> </Configuration> What would the equivalent file look like as (valid) YAML? ❐ The YAML file The equivalent YAML file ( log4j2.yaml ) looks like this: Configuration: status:

#前言 前面一篇博客( 《繁华浮尘，倾听Appenders的故事？》 )讲到的各种Appender的配置以及使用，当然还有些未写全，更多的可以去查阅官网的资料。本篇博客讲介绍各种的Filter的配置以及相应使用，Filter可以配置在全局中，可以配置在Appender或者Appender Reference中，亦可配置在Logger中，达到控制过滤不同的日志模块信息；利用这些Filter可以实现控制日志的输出、动态控制日志的级别甚至使用脚本过滤器自己实现更为复杂的过滤控制。 Filter执行时会调用其中的一个方法并返回一个结果，该结果是一个枚举，包含：ACCEPT, DENY或者NEUTRAL。Filter可以配置在如下四个作用域： 全局范围，即直接配置在configuration最外层：该作用域的Filter直接过滤日志信息而不传递至Logger做进一步处理；若配置多个全局filter，则有且仅有一个起效，同时logger定义的level也将失效(若filter中配置了level)；Logger 和 Appender的filter将覆盖全局的filter； Logger范围： 配置在某个具体的Logger中，该filter不会传递至父级的Logger中，即使additivity配置为true； Appender范围：作用于Appender是否处理日志过滤操作； Appender

I use log4j2 2.10.0 and have the following code: SingleChronicleQueue q = SingleChronicleQueueBuilder.binary(args[0]).blockSize(536870912).build(); ExcerptAppender a = q.acquireAppender(); char[] chars = "abcdefghijklmnopqrstuvwxyz".toCharArray(); StringBuilder sb = new StringBuilder(); Random random = new Random(); for (int i = 0; i < 1000; i++) { char c = chars[random.nextInt(chars.length)]; sb.append(c); } String t = sb.toString(); for (int i = 0; i < 1000000; i ++ ) { m_logger.info(i + " " + t); a.writeText(t); } Both the cq4 and the log is writing to the same dir. And in the log, it was

I am having trouble Hot Deploying a Spring-MVC 4.0 (not SpringBoot) Web Application. I am trying to go xml-less and just use JavaConfig. OutOfMemoryErrors result when I remove web.xml , or when I deploy an empty web.xml with nothing but an empty element . This does not happen every time the app is hot-deployed, and after a successful hot-deployment, the app does work correctly, but after three or four hot-deployments with this configuration the following error occurs: Jul 03, 2015 10:49:43 AM org.springframework.web.context.ContextLoader initWebApplicationContext SEVERE: Context initialization

So I'm trying to learn log4j2 and wrap my head around the loggers and their levels and parental propagation. Currently my source hierarchy runs is: ├── main │ ├── java │ │ └── calculatorMain │ │ ├── Main.java │ │ ├── someClass2.java │ │ └── someClass1.java │ └── resources │ ├── Excels │ │ └── TestExcel.xlsx │ ├── FXMLs │ │ └── mainWindow.fxml │ └── log4j2.xml and my calculatorMain is: Public class Main extends Application { private static final String mainWindow = //FXML stuff private static final Logger logger = LogManager.getLogger(Main.class.getName()); public static void main(String[] args