log4j | 易学教程

Log4j日志级别

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日志记录器(Logger)是日志处理的核心组件。 log4j具有5种正常级别(Level)。日志记录器(Logger)的可用级别Level (不包括自定义级别 Level)，以下内容就是摘自log4j API ( http://jakarta.apache.org/log4j/docs/api/index.html ): public static final Level TRACE The TRACE Level designates finer-grained informational events than the DEBUG . Since:1.2.12 static Level DEBUG DEBUG Level指出细粒度信息事件对调试应用程序是非常有帮助的。 static Level INFO INFO level表明消息在粗粒度级别上突出强调应用程序的运行过程。 static Level WARN WARN level表明会出现潜在错误的情形。 static Level ERROR ERROR level指出虽然发生错误事件，但仍然不影响系统的继续运行。 static Level FATAL FATAL level指出每个严重的错误事件将会导致应用程序的退出。另外，还有两个可用的特别的日志记录级别: (以下描述来自log4j API http:/

Does logback support log4j appenders?

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问题 Can custom appenders created for log4j (extending AppenderSkeleton) be used with new logback framework? I know that logback comes with its own set of appenders similar to log4j, but is this possible to re-use existing ones? How? 回答1: The following document describes how to "[migrate] custom log4j components such as appenders or layouts to logback-classic": http://logback.qos.ch/manual/migrationFromLog4j.html 回答2: It should be easy to port a log4j appender to logback. There is even a document

启动Spring boot项目报错：java.lang.IllegalArgumentException: LoggerFactory is not a Logback

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报错如下： java.lang.IllegalArgumentException: LoggerFactory is not a Logback LoggerContext but Logback is on the classpath. Either remove Logback or the competing implementation (class org.apache.logging.slf4j.Log4jLoggerFactory loaded from file:/D:/develop/apache-maven-3.5.3/repo/org/apache/logging/log4j/log4j-slf4j-impl/2.7/log4j-slf4j-impl-2.7.jar). If you are using WebLogic you will need to add 'org.slf4j' to prefer-application-packages in WEB-INF/weblogic.xml: org.apache.logging.slf4j.Log4jLoggerFactory 原因：由于springboot默认日志组件为logback，如果项目使用的为log4j，在打包到tomcat启动时报如上错误。原因

springboot日志配置，关于logback

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1.依赖 <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-logging</artifactId> Spring Boot项目一般都会引用 spring-boot-starter 或者 spring-boot-starter-web ，而这两个起步依赖中都已经包含了对于 spring-boot-starter-logging 的依赖，所以，无需额外添加依赖。可以在idea右上角的maven中查看jar包依赖关系。 2.使用 2.1 关于约定日志有很多东西需要配置，但是又好像不需要配置什么东西，今天一段话点醒了我。据不同的日志系统，按照指定的规则组织配置文件名，并放在 resources 目录下，就能自动被 spring boot 加载： Logback：logback-spring.xml, logback-spring.groovy, logback.xml, logback.groovy Log4j: log4j-spring.properties, log4j-spring.xml, log4j.properties, log4j.xml Log4j2: log4j2-spring.xml, log4j2.xml JDK (Java Util Logging)：

Unable to append the date to the file name using log4j DailyRollingFileAppender

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Hi I am trying to append the current date to the file name using log4j DailyRollingFileAppender, but its not working. I have used the configuration like below. Please suggest a solution for this properties log4j.rootLogger = DEBUG, rollingAppender log4j.appender.rollingAppender=org.apache.log4j.DailyRollingFileAppender log4j.appender.rollingAppender.DatePattern='.'yyyy-MM-dd log4j.appender.rollingAppender.File=F:/temp/app.log log4j.appender.rollingAppender.layout=org.apache.log4j.PatternLayout log4j.appender.rollingAppender.layout.ConversionPattern=[%p] %d %c %M - %m%n I am expecting the log

Kafka Consumer outputs excessive DEBUG statements to console (ecilpse)

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问题 I'm running some sample code from http://www.javaworld.com/article/3060078/big-data/big-data-messaging-with-kafka-part-1.html?page=2, and the kafkaconsumer is consuming from topic as desired, but every poll results in print (to std out) of many debug logs, which I don't want. I have tried changing all INFO and DEBUG to ERROR (even did a grep to make sure) in /config/log4j.properties , in particular setting log4j.logger.kafka=ERROR , kafkaAppender, but the problem persists. I referred to How

Using Syslog's unix socket with Log4J2

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问题 I would like to send the logs of an application on a rsyslog server using the client protocol : Unix socket. Both application and rsyslog server are on the same machine. I've been comparing different logging tools : Log4J, Logback and Log4J2. Log4J's Syslog appender doesn't permit it natively. A solution is to use Syslog4J and configure our Syslog4JAppender this way : <appender name="mySyslogAppender" class="org.productivity.java.syslog4j.impl.log4j.Syslog4jAppender"> <param name="protocol"

How to add the date timestamp to log4j2 logfiles?

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问题 I want to create day dependent logfiles with log4j2 : <RollingFile name="APP" fileName="application-%d{yyyy-MM-dd}.log" /> Resulting logfile name: application-%d{yyyy-MM-dd}.log , the timestamp is not replaced. Why? 回答1: The pattern should not be given in the attribute "fileName" rather you have to specify the pattern in the attribute "filePattern" as like below. <RollingFile name="RollingFile" fileName="${log-path}/filename.log" filePattern="${log-path}/filename-%d{yyyy-MM-dd}-%i.log" > ...

Find a way in the java logging frameworks scene

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Java has a lot of frameworks / APIs that help you do logging in your application: The Java API has java.util.logging package. Apache's Log4j. Apache's Commons Logging. SLF4J (logging Facade). jLo. and many many more... I've always used the log4j library, i found it sufficient most of the time, and extensible when i needed more control. Anyone who had experience with more than one framework can share his experience? when is it better to use one framework over the other and from application architecture point of view? Why would i prefer one over other? Thanks kdgregory This question seems

Log4j .append=true property fail

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I am using log4j (2.1.16) with a DailyRollingFileAppender, with the append property set to true. However, everytime I restart the web application it does not append, it simply overwrites the file. log4j.appender.eformsAccess=org.apache.log4j.DailyRollingFileAppender log4j.appender.eformsAccess.file=to be set in the code(SchemeActionBean.java) log4j.appender.eformsAccess.datePattern='.'yyyyMMdd log4j.appender.eformsAccess.append=true log4j.appender.eformsAccess.ImmediateFlush=true log4j.appender.eformsAccess.layout=org.apache.log4j.PatternLayout log4j.appender.eformsAccess.layout

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