log4j

Using log4j2 in Spark java application

大憨熊 提交于 2019-12-03 21:41:24
I'm trying to use log4j 2 logger in my Spark job. Essential requirement: log4j2 config is located outside classpath, so I need to specify its location explicitly. When I run my code directly within IDE without using spark-submit , log4j2 works well. However when I submit the same code to Spark cluster using spark-submit , it fails to find log42 configuration and falls back to default old log4j. Launcher command ${SPARK_HOME}/bin/spark-submit \ --class my.app.JobDriver \ --verbose \ --master 'local[*]' \ --files "log4j2.xml" \ --conf spark.executor.extraJavaOptions="-Dlog4j.configurationFile

How to create a rolling file appender plugin in log4j2

这一生的挚爱 提交于 2019-12-03 21:30:54
I want to create a custom log4j2 rolling file appender. I need to create this custom appender because I want to wrap the log4j log event with some information unique to my application. Such as userId, hosted application name. I have a class which extends Log4jLogEvent implements LogEvent. This class has information that I need to wrap with the log event. Please see this code : public class CustomLogEvent extends Log4jLogEvent implements LogEvent { private String userId; private String applicationName; private static final long serialVersionUID = 1L; public CustomLogEvent(String loggerName,

繁华浮尘,倾听Appenders的故事

孤人 提交于 2019-12-03 21:09:24
#前言 前面一篇博客(《 纷乱日志框架,你选谁?》 )讲了各种的日志框架的概况,后续的博客将针对log4j 2的配置做一些介绍,最后会去探讨和研究下log4j 2内部的结构以及实现,然后这一系列的博客就结束了。 关于log4j 2的配置,将会从Appenders入手开始,看完官网的相应资料以及自己的动手实验,会感觉log4j 2提供了相当强大的日志活动以及过滤操作的支持,让人情不自禁的想去了解内部是怎样的一种架构。当然心急吃不了热豆腐,让我们先来感受感受log4j 2的Appender强大功能,倾听这位乱世佳人的故事。 #Appenders Appenders作用是传递日志活动(logEvents)至目标Logger上,每个Appender都实现了 Appender 接口。大多数Appenders继承了 AbstractAppender ,这个抽离类实现了 Lifecycle 接口和 Filterable 接口,因而提供了相应生命周期以及过滤功能的支持。 Appender通常只负责写相关日志数据至目标Logger上,大多数情况下,它还需要格式化相应的日志数据。有些Appender还封装了其它的Appender,以实现可以修改日志活动信息,处理Appender的内部失败,基于高级的过滤规则路由信息至稳定的Appender等功能。 Appender通常会被命名一个名字

spring+mybatis+druid集成log4j2

谁都会走 提交于 2019-12-03 21:09:10
log4j2是log4j的替代产品,log4j2支持异步读写,在日志的读写性能上有很大的提高。相应的也就提高了系统的吞吐量。log4j没有更新了,已经被抛弃,所以在新的项目中完全可以抛弃log4j,然后采用log4j2或者logback作为日志实现方案。 本文主要是记录log4j2与目前常采用的Spring+Spring MVC+Mybatis+druid架构的web项目环境的集成。关于log4j2的新特性和功能,请参考官网或者参阅他人博客。 第一步:引入log4j2相关依赖 <log4j2.version>2.8.1</log4j2.version> <!--加入log4j依赖--> <!--use log4j2--> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>${log4j2.version}</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-jcl</artifactId> <version>${log4j2.version}</version> </dependency

springboot使用log4j输出

泪湿孤枕 提交于 2019-12-03 21:08:59
参考链接: springboot日志体系---log4j2 前言 在搭建开发框架的时候,看了Springboot官方文档推荐使用Logback和log4j2做日志的输出,最终选择了log4j2 本文解决以下问题: - 为何使用log4j2 - springboot下log4j2日志的使用 - 控制台日志显示的级别和文件保存的日志不同 - idea控制台颜色日志的输出 - 输出mybastis的SQL - console file rolling-file使用不同的策略 正文 log4j2   目前有关日志的开源代码很多,如log4j、sl4j和log4j2,为什么我选择使用log4j2呢,看完下面两篇性能的对比,相信你也会选择log4j2 http://www.jianshu.com/p/483a9cf61c36 https://blog.souche.com/logback-log4j-log4j2shi-ce/?utm_source=tuicool&utm_medium=referral springboot集成Log4j2 需要将springboot内置的日志剃掉,然后引入log4j2,pom如下 <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter

Log4j Implementation in Android

无人久伴 提交于 2019-12-03 20:56:46
I am new to android development.I want to write logs to one file in SD Card.How can i do this using Log4j.What all are the steps to Implement Log4j.I read many atricles.But none of them describing how to configure and implement it.Can anyone please explain how to do this in android in simple words. You should look at logback (the next generation of log4j). Use the FileAppender or RollingFileAppender . Instructions: Add slf4j-api-1.6.6.jar and logback-android-1.0.6-2.jar to your classpath. Create the file assets/logback.xml in your project (or use the AndroidManifest.xml ...see example ),

Spring Boot + Log4j2 日志框架配置 (Maven)

萝らか妹 提交于 2019-12-03 20:30:10
参考Spring Boot官方文档 日志部分 Spring Boot默认情况下,当使用"Starters" 使用Logback输出日志 , 还包括适当的Logback路由, 确保其他的日志框架(Java Util Logging, Commons Logging, Log4j, SLF4J)都能正常使用 Sping Boot文档的 26.5 Custom Log Configuration 章节,说明了自定义日志配置方法 多样的日志系统可以通过 添加适当的日志框架库到classpath 适当的配置配置文件加入到classpath的根目录 或者 其他的本地目录, 使用Spring配置 loggin.config 配置指定配置文件 依赖于开发者选择的日志框架. 这些对应的配置文件会被加载 日志框架 配置文件 Logback logback-spring.xml , logback-spring.groovy , logback.xml , logback.groovy Log4j2 log4j2-spring.xml , log4j2.xml JDK(JAVA Util Logging) logging.properties 引入Log4j2日志框架 Log4j2为何物就不介绍了. Log4j2官网 配置的方案 在官方文档 77.2 Configure Log4j for

LOG4J Multiple Loggers in same class

試著忘記壹切 提交于 2019-12-03 20:06:54
I have a java project that has a log4j logging. It uses a rolling file appender and multiple loggers to log to a file. I want to add a DBappender and have a seperate logger that only writes to this appender, with none of the other loggers sending messages to it. I need, say one class to have two loggers, one writing to the fileAppender and one writing to the dbAppender. Is this possible, if so what is the configuration for it? Thanks It's possible to use two Logger s in one class. First idea: get the two loggers with different names: package com.mycompany.apackage.MyClass; public class MyClass

“log4j:configuration” must match “(renderer….loggerFactory)?)”

半腔热情 提交于 2019-12-03 19:21:11
问题 getting error, when deploying my war file to tomcat: log4j:WARN The content of element type "log4j:configuration" must match "(renderer*,throwableRenderer?,appender*,plugin*,(category|logger)*,root?,(categoryFactory|loggerFactory)?)" I googled around and found out that ordering of my log4j.xml could be wrong, but it should be correct. <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">

Tomcat randomly shuts down with an AbstractProtocol pause after mild usage

吃可爱长大的小学妹 提交于 2019-12-03 19:03:20
问题 After running my webapp for a while (timing varies between hours and days depending on traffic) Tomcat seemingly randomly shuts itself down. There's nothing out of the ordinary in the log before this happens (no exceptions) just normal INFO stuff that my app emits. Can anyone help on how best to debug this? Is there anything in Tomcat that would trigger the AbstractProtocol pause signal? Logs: 09-Nov-2011 21:40:19 org.apache.coyote.AbstractProtocol pause INFO: Pausing ProtocolHandler ["http