log4j

Capture javax.net.debug to file

ε祈祈猫儿з 提交于 2019-12-10 01:59:13
问题 I need to save the javax.net.debug=all output that is created to a file. I'm using log4j and I tried creating a logging proxy as in the code example below; however, it is not picking up the info. I am not sure where the javax.net.debug is being printed to. I tried capturing system.out and system.err this way but neither worked. Thanks for your help. public class StdOutErrLog { private static final Logger logger = Logger.getLogger(StdOutErrLog.class); public static void tieSystemOutAndErrToLog

Java日志打印: log4j2

China☆狼群 提交于 2019-12-10 01:42:21
1. Java 常用日志输出 java 中进行日志打印的方法有很多种,主要分为以下几类: 1 最简单的 system.print.out、err之类的打印 2 java.util.logging ; 在JDK 1.4 版本之后,提供了日志的API ,可以往文件中写日志了 3 log4j , 最强大的记录日志的方式。 可以通过配置 .properties 或是 .xml 的文件, 配置日志的目的地,格式等等 4 commons-logging, 最综合和常见的日志记录方式, 经常是和log4j 结合起来使用 当然这里并不打算介绍每一种日志输出,而是着重讲一下 log4j 日志打印。 2. log4j log4j 作为之前比较流行的日志打印插件,可以在控制台打印信息,并将信息记录到文件里面。但随着 log4j2 的出现, log4j 逐渐被舍弃。 3. log4j2 log4j2 和 log4j 同属一个作者开发 , log4j2 是 后来 重新架构的一款日志组件,抛弃了之前 log4j 的不足,以及吸取了优秀的 logback 的设计重新推出的一款新组件。 3.1. log4j2 和 slf4j 一般来说 log4j2 是和 slf4j 搭配使用,主要原因如下: log4j2 是一个日志框架, slf4j 是日志框架接口,之所以使用 log4j2 和 slf4j

Tomcat: OutOfMemoryError Permgen Space

元气小坏坏 提交于 2019-12-10 00:06:36
问题 I am developing a JSP application using Tomcat 6. Since I did add Quartz Scheduler Framework and Log4J library to project, Tomcat start throwing this exception when redeploying. I have readed about the problem causes, and now I know that have to be with the class loader. So, I guess the problem can be caused by the logger library that load some classes automatically. How can I deal with this problem? There is alternative way to setup the logger without using the log4j.properties file to

Robot Framework: log messages sent through log4j's ConsoleAppender are not visible in output

北慕城南 提交于 2019-12-09 23:46:06
问题 I use Robot Framework with custom keywords implemented in java libraries. Messages written directly to System.out from my java classes are visible in the robot output - as promised in documentation. However, since the keyword implementations are reusable components, independent from robot framework, I wanted to have more flexible logging there and not using System.out directly. I thought if I redirect my log output to System.out (with log4j's ConsoleAppender), the messages will be visible in

Could not initialize class org.apache.log4j.Log4

蓝咒 提交于 2019-12-09 20:30:02
(一) 现象与解决方法 前些天在进行storm job的开发时候突然报了一个错误,记录一下 Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.apache.log4j.Log4jLoggerFactory 当然我们的第一个反应是log4j这个包缺失(当然也有这种情况,需要首先确认),打开pom文件查看依赖,文件确实存在。 后经网上搜索加边上大牛指点发现: log4j-over-slf4j.jar 和 slf4j-log4j12.jar 在同一个classpath下就会出现这个错误。 解决方法: 将slf4j-log4j12.jar从相关的jar中排除 (二) 日志组件tips 那么问题来了,为啥会有这种冲突呢?在这里需要简单的说一下log的故事! (1)common-logging、log4j、slf4j、logback common-logging common-logging是apache提供的一个通用的日志接口; 在common-logging中,有一个Simple logger的简单实现,但是它功能很弱,所以使用common-logging,通常都是配合着log4j来使用; common-logging会通过动态查找的机制,在程序运行时自动找出真正使用的日志库

【J2EE系列】log4j日志输出分级别或模块到不同文件

半世苍凉 提交于 2019-12-09 20:29:50
一、 实现分模块,输出到不同的日志文件, 以下是log4j.properties的实现 log4j.appender.file=org.apache.log4j.DailyRollingFileAppender log4j.appender.file.file=src\\log\\all.log log4j.appender.file.DatePattern='.'yyyy-MM-dd log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n log4j.rootLogger=debug,file log4j.appender.usermanagerfile=org.apache.log4j.DailyRollingFileAppender log4j.appender.usermanagerfile.file=src\\log\\usermanager.log log4j.appender.usermanagerfile.DatePattern='.'yyyy-MM-dd log4j.appender.usermanagerfile

log4j+commons-logging结合使用

痞子三分冷 提交于 2019-12-09 20:07:04
1.参考文献: Apache Commons-logging使用实例 Apache Log4j配置说明 log4j.properties配置详解 commons-logging结合Log4j的问题 Properties文件相关 Apache通用日志工具commons-logging和Log4j使用总结 2. Commons-Loggin 简介 Apache针对不同的语言平台为做了一系列日志工具包,可应用于java、.net、php、c++,这些日志包都是免费的,使用非常方便,可以极大提高编程效率。并且,Apache为了让众多的日志工具有一个相同操作方式,还实现做了一个通用日志工具包: commons-logging,也称Jakarta Commons Logging (JCL) 。commons-logging是为那些需要建立在不同环境下使用不同日志架构的组件或库的开发者创建的,其中包括Apache Log4j以及Java log的日志架构。把日志信息commons-logging的Log接口,并由commons-logging在运行时决定使用哪种日志架构。现在,Apache通用日志工具commons-logging和Log4j已经成为Java日志的标准工具。 3.快速入门 JCL有两个基本的抽象类:Log(基本记录器)和LogFactory(负责创建Log实例)。当commons

Have you seen an appender that would log to separate files based on NDC in Log4j? [closed]

浪尽此生 提交于 2019-12-09 19:00:32
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 3 years ago . We have only a very small number of customers (fewer than 50) and we would like each one to have its own separate log file into which all of its server side logging info goes. I know you could use NDC and filters to direct log statements to different files using the standard appenders in Log4j but that would

How do I redirect log4j output to my HttpServletResponse output stream?

梦想的初衷 提交于 2019-12-09 17:46:40
问题 I'm using log4j 1.2.15 in a Spring 3.1.1.RELEASE application deployed on JBoss AS 7.1.1.Final. I'm trying to route output written in log4j to my response output stream. I have output written like this private static final Logger LOG = Logger.getLogger(TrainingSessionServiceImpl.class); … LOG.info("Creating/updating training session associated with order #:" + order.getId()); and I'm trying to route it to my output stream like so … @RequestMapping(value = "/refreshPd", method = RequestMethod

SpringBoot日志处理之Logback

此生再无相见时 提交于 2019-12-09 16:23:11
日志处理是一个正式项目必备的功能,日志要能够根据时间、类型等要素,根据指定格式来保存指定的日志,方便我们观察程序运行情况、定位程序bug。 SpringBoot 中推荐使用Logback日志框架。 本节示例项目在 https://github.com/laolunsi/spring-boot-examples slf4j:一个针对各类Java日志框架的统一facade抽象。 java 常见日志框架:java.util.logging, log4j, logback, commons-logging logback是log4j的作者开发的新一代日志框架,目前应用最广泛。SpringBoot默认使用logback,默认INFO级别 Logback: 日志加载顺序:logback.xml -> application.properties -> logback-spring.xml 一、日志级别 log4j定义的日志级别:debug/info/warn/error/fatal warn,潜在错误;error,错误,可能导致程序退出;fatal,严重错误,程序会退出 还有两个特殊的级别:OFF-最高级别,ALL-最低级别 log4j建议仅使用debug/info/warn/error四个级别 日志级别:ERROR -> WARN -> INFO -> DEBUG 如配置日志级别为INFO