log4j

Does log.debug decrease performance

由 早过忘川 提交于 2019-12-09 00:38:01
问题 I want to write some logs at the debug log which will not be available in the production logs which has info log level. So how will this extra debug logs affect the performance? I mean if we set the log level at INFO, the logger has to check what the log level is and find that the log.debug needto be ignored. So does this extra log level checking affect performance? Is there any automagical way of removing the log.debug() statements while deployment? I mean during development time the log

Finding Log4J log file

由 佐手、 提交于 2019-12-09 00:27:09
问题 I'm working on a project that uses Log4J via Commons. I'm trying to find the path to the log file, but I'm not finding an appropriate method that will return the logfile path from the Logger. Anyone ever attempted this? 回答1: You have to get all appenders from the root logger and then get the name of the log file. Enumeration e = Logger.getRootLogger().getAllAppenders(); while ( e.hasMoreElements() ){ Appender app = (Appender)e.nextElement(); if ( app instanceof FileAppender ){ System.out

Exactly how slow are C, F, L, l and M of PatternLayout (log4j)?

由 折月煮酒 提交于 2019-12-08 23:39:29
问题 It's common knowledge that C , F , L , l and M of PatternLayout are slow: WARNING Generating caller location information is extremely slow and should be avoided unless execution speed is not an issue. Also, this book mentions that some applications can gain 10% speed only from changing the logging format. But the question is, exactly how slow are these conversion characters? 回答1: I measured locally on my computer using a FileAppender. I warmed up the test nicely, measured many executions and

How can I integrate Tomcat6's catalina.out file with Logstash + ElasticSearch + Kibana?

由 前提是你 提交于 2019-12-08 23:27:51
问题 I want to have a centralized logging server. I have created two Ubuntu 12.04 LTS servers based on this iso. After successfully and strictly following this tutorial steps, I have: One Logging Server with Logstash + ElasticSearch + Kibana. And one Application Server with a Logstash-Forwarder, Tomcat 6 and another app, which logs are being registered in the catalina.out file. My question is: What 'for-dummies' steps should I follow now in order to send catalina.out logs from the App Server to

Seperate logs for different jars in war file

由 岁酱吖の 提交于 2019-12-08 23:10:34
I have a war file which is deployed on jboss server. This war contains some jar files. What i need is to create seperate logs for different jars. I am using log4j for logging purpose and also intergrated log4j properties file in each jar. My log4j for every jar have different paths. Still the logs are generated in server.log of jboss. I need help to generate seperate logs for every jar. If you want to make different log file for different jar, you will have to configure it in your log4j.properties file related to every jar(I assume that every jar have different package naming convention). Here

Log4j.properties配置详解

由 大憨熊 提交于 2019-12-08 21:30:30
参考博客 https://www.jianshu.com/p/ccafda45bcea 一、log4j简介 log4j主要有三个重要的组件： Loggers(记录器)：日志类别和级别； Appenders(输出源)：日志要输出的地方； Layout(布局)：日志以何种形式输出。 1、Loggers Loggers组件在此系统中被分为五个级别：DEBUG、INFO、WARN、ERROR和FATAL。这五个级别是有顺序的，DEBUG < INFO < WARN < ERROR < FATAL，分别用来指定这条日志信息的重要程度 Log4j有一个规则：只输出级别不低于设定级别的日志信息，假设Loggers级别设定为INFO，则INFO、WARN、ERROR和FATAL级别的日志信息都会输出，而级别比INFO低的DEBUG则不会输出。 2、Appenders 禁用和使用日志请求只是Log4j的基本功能，Log4j日志系统还提供许多强大的功能，比如允许把日志输出到不同的地方，如控制台（Console）、文件（Files）等，可以根据天数或者文件大小产生新的文件，可以以流的形式发送到其它地方等等。 常使用的类如下： org.apache.log4j.ConsoleAppender（控制台） org.apache.log4j.FileAppender（文件） org.apache.log4j

Disable logging with hibernate from maven

由 余生长醉 提交于 2019-12-08 19:20:59
问题 I have recently added hibernate to my pom.xml, and it is working fine. However, the logging is irritating and i'm not sure how to turn it off or limit the level of it (I don't even know exactly what it has included to start all this logging). I am new to this, to maven and to hibernate. Here is my pom.xml dependencies: <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- Hibernate --> <dependency> <groupId

Putting Logger.info in static block

由 喜欢而已 提交于 2019-12-08 19:14:18
问题 I have the following class public class MyClass { private static final Logger logger = Logger.getLogger(MyClass.class); static { logger.info("some text"); } } Is it safe to assume that by the time we reach logger.info , the log4j system is initialized and is ready to emit logs? It seems that if I am able to do a Logger.getLogger() and get back a valid Logger instance, it means that Log4j is initialized, right? 回答1: Yes, it is. Static initializers (that is, both static {} blocks and initial

log4j:WARN No such property [maxFileSize] in org.apache.log4j.DailyRollingFileAppender

由 孤街浪徒 提交于 2019-12-08 17:30:28
问题 Everything works just as fine. But showing this error. My log4j.properties file like : # Root logger option log4j.rootLogger=DEBUG, stdout, file # Redirect log messages to console log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n # Redirect log messages to a log file, support file rolling. log4j

How to implement “configureAndWatch” in log4j2

由 ╄→尐↘猪︶ㄣ 提交于 2019-12-08 17:28:15
问题 In log4j , there is a feature configureAndWatch (as mentioned below) where without application server restart, log threshold level can be modified with default delay. org.apache.log4j.xml.DOMConfigurator.configureAndWatch(log4j.xml path); Is this possible in log4j2 as well ? If yes, then how can this be achieved ? Also, below are lines of code for setting up and cleaning up log4j setup. BasicConfigurator.configure() BasicConfigurator.resetConfiguration() How can this be achieved in log4j2 ?
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