log4j2

I'm trying to configure Tomcat 8 to use Log4j2 for logging. I've found this reference for Logging in Tomcat using Log4j . It provides a sample log4j.properties file that configures Log4j to match Tomcat's internal logging. Most of this looks pretty straightforward to convert for Log4j2, but the section at the end that maps loggers to appenders has me stumped: # Configure which loggers log to which appenders log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost] = INFO, LOCALHOST log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/manager] =\ INFO,

I am trying to create new log files on an hourly basis. I am using TimeBasedTriggerringPolicy of lo4j2 in RollingFileAppender. Below is the sample xml configuration code i have taken from log4j2 official site. <?xml version="1.0" encoding="UTF-8"?> <Configuration status="warn" name="MyApp" packages=""> <Appenders> <RollingFile name="RollingFile" fileName="logs/app.log" filePattern="logs/$${date:yyyy-MM}/app-%d{yyyy-MM-dd-HH}-%i.log.gz"> <PatternLayout> <Pattern>%d %p %c{1.} [%t] %m%n</Pattern> </PatternLayout> <Policies> ** <TimeBasedTriggeringPolicy interval="1" modulate="true" /> **

Is it possible to add Log4J2 appenders programmatically using the specifications from the XML configuration? I plan to define it all in the log4j2.xml and then pick appenders situationally like this (won't compile): if (arg[0].equals("log") ) { Logger.getLogger("loggerNameFromXMLConfig").addAppender("appenderNameFromXMLConfig"); } else { //... } Robert Fleming Edit: for the newest versions of log4j2, see https://stackoverflow.com/a/33472893/1899566 instead. I get the impression they don't want you doing this, but this works for me: if (arg[0].equals("log") ) { org.apache.logging.log4j.Logger

I must be missing something but I have been looking at this for a few days now, but why on earth would you ever use log4j2 over log4j (other than the performance)? From what I have seen so far, log4j2 is advertised as simpler to configure, but its actually vastly more complicated (been three days now and I still cant get it to write a log in my home directory). The auto configuration simply does not work for me (or at least I cant get it to work), the configuration file itself is substantially more complex in its structure and appears to be much harder to add things in at runtime to help

#1 系列目录 jdk-logging、log4j、logback日志介绍及原理 commons-logging与jdk-logging、log4j1、log4j2、logback的集成原理 slf4j与jdk-logging、log4j1、log4j2、logback的集成原理 slf4j、jcl、jul、log4j1、log4j2、logback大总结 #2各种jar包总结 log4j1: log4j：log4j1的全部内容 log4j2: log4j-api:log4j2定义的API log4j-core:log4j2上述API的实现 logback: logback-core:logback的核心包 logback-classic：logback实现了slf4j的API commons-logging: commons-logging:commons-logging的原生全部内容 log4j-jcl:commons-logging到log4j2的桥梁 jcl-over-slf4j：commons-logging到slf4j的桥梁 slf4j转向某个实际的日志框架: 场景介绍：如 使用slf4j的API进行编程，底层想使用log4j1来进行实际的日志输出，这就是slf4j-log4j12干的事。 slf4j-jdk14：slf4j到jdk-logging的桥梁 slf4j

#1 系列目录 jdk-logging、log4j、logback日志介绍及原理 commons-logging与jdk-logging、log4j1、log4j2、logback的集成原理 slf4j与jdk-logging、log4j1、log4j2、logback的集成原理 slf4j、jcl、jul、log4j1、log4j2、logback大总结 #2 slf4j 先从一个简单的使用案例来说明 ##2.1 简单的使用案例 private static Logger logger=LoggerFactory.getLogger(Log4jSlf4JTest.class); public static void main(String[] args){ if(logger.isDebugEnabled()){ logger.debug("slf4j-log4j debug message"); } if(logger.isInfoEnabled()){ logger.debug("slf4j-log4j info message"); } if(logger.isTraceEnabled()){ logger.debug("slf4j-log4j trace message"); } } 上述Logger接口、LoggerFactory类都是slf4j自己定义的。 ##2.2

I'm trying to configure log4j to keep only specified amount of backup files or keep files that are not older than some age. Ultimately I want to have time [daily] based triggering policy and keep 30 backup files or delete files that are older then 30 days. After doing some research I learned that I can't specify max number of backup files when using time policy however I came across this issue https://issues.apache.org/jira/browse/LOG4J2-435 and this documentation fragment http://logging.apache.org/log4j/2.x/manual/appenders.html#CustomDeleteOnRollover that describes how to delete files based

How can I make Spring log properly via log4j2 along with the other dependencies I have (Hibernate, Netty, Mina, etc.)? I tried many different thins and dependency combinations. But I either can get Spring to log and nothing else, or everything but Spring. With all dependecies logging properly (but Spring) I get the following error: java.lang.NoSuchMethodError: org.apache.logging.log4j.core.config.ConfigurationFactory.getConfiguration(Lorg/apache/logging/log4j/core/config/ConfigurationSource;)Lorg/apache/logging/log4j/core/config/Configuration; at org.springframework.boot.logging.log4j2