log4j | 易学教程

详解intellij idea搭建SSM框架(spring+maven+mybatis+mysql+junit)(上)

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SSM（Spring+SpringMVC+MyBatis）框架集由Spring、SpringMVC、MyBatis三个开源框架整合而成，常作为数据源较简单的web项目的框架。其中spring是一个轻量级的控制反转（IoC）和面向切面（AOP）的容器框架。 SpringMVC分离了控制器、模型对象、分派器以及处理程序对象的角色，这种分离让它们更容易进行定制。 MyBatis是一个支持普通SQL查询，存储过程和高级映射的优秀持久层框架。本文旨在快速且详细的介绍intellij idea 搭建SSM框架的过过程，特别适合对SSM框架不是很熟且感兴趣的朋友。 v 准备工作开发环境准备 apache-tomcat-9.0 https://tomcat.apache.org/download-90.cgi apache-maven https://maven.apache.org/download.cgi MySQL https://www.mysql.com/downloads/ workbench https://dev.mysql.com/downloads/workbench/ Java jdk http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html IntelliJ

slf4j-api下的log4j与logback包冲突

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> #1 问题描述# 千丁洗衣项目qd-laundry工程在部署到线上服务器时，由于会存在memcached的心跳机制，不断的有心跳日志输出，且日志级别为DEBUG，导致每天的日志文件都非常大，大概在27G左右。所以必须要关掉memcached的心跳日志输出。 #2 排查过程# 问题重现：在DEV环境，确定Slf4j与Log4j Jar包依赖是否正确；【结果：Jar包依赖无问题】确定log4j.xml的日志级别，全部改成INFO，不存在DEBUG。【结果：memcached的心跳日志仍输出】查看启动日志，确定Log4j加载的log4j.xml是否正确。【结果：确实加载正确的log4j.xml】确定是否依赖其他具体日志实现的Jar包。【结果：在POM依赖中，有平台Jar包依赖了logback】 <dependency> <groupId>com.qding.basis.user</groupId> <artifactId>api</artifactId> </dependency> # 其api的POM中又依赖了logback： <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <

How to configure Tomcat JULI logging to roll log files?

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问题 I have a several webapps which use java.util.logging. Tomcat 5.5 is configured to use the Juli logger so that each webapp has its own log file. The problem is that Juli does not have properties for maximum file size and file count. Using Juli the files will grow unbounded and only roll at the end of the day. Also, an unlimited number of log files are retained. You can see the FileHandler properties on this page - Apache Tomcat 5.5 Documentation There is no limit or count property (the

How do I set log4j level on the command line?

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问题 I want to add some log.debug statements to a class I'm working on, and I'd like to see that in output when running the test. I'd like to override the log4j properties on the command line, with something like this: -Dlog4j.logger.com.mypackage.Thingie=DEBUG I do this kind of thing frequently. I am specifically only interested in a way to pass this on the command line. I know how to do it with a config file, and that doesn't suit my workflow. 回答1: log4j does not support this directly. As you do

How to add Log4J2 appenders at runtime programmatically?

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问题 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 { //... } 回答1: Edit: for the newest versions of log4j2, see https://stackoverflow.com/a/33472893/1899566 instead. I get the impression they don't want you

Log4j2 why would you use it over log4j? [closed]

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问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 4 years ago . 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

How to find which library slf4j has bound itself to?

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问题 I am using slf4j for logging in my application. I get the purpose of slf4j. I would like to know how to find out which logging-library slf4j is currently binding to. I have log4j in my referenced libraries. I am assuming that slf4j has bound itself to log4j. What I would like to know is, is there any way to explicitly confirm this binding? 回答1: Just do what SLF4J does to discover the binding: final StaticLoggerBinder binder = StaticLoggerBinder.getSingleton(); Now you can try to find out what

What is the difference between log4j, slf4j and logback?

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问题 I am little bit confused by these three logger libraries. It seems like that they can do the similar thing in java logging... 回答1: Check out their home pages: SLF4J - The Simple Logging Facade for Java (SLF4J) serves as a simple facade or abstraction 1 for various logging frameworks (e.g. java.util.logging, logback, log4j) allowing the end user to plug in the desired logging framework at deployment time. 1) It is not itself a logging library, but a generic interface to one of many logging

How can I test with junit that a warning was logged with log4j? [duplicate]

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问题 This question already has answers here : How to do a JUnit assert on a message in a logger (24 answers) Closed 2 years ago . I'm testing a method that logs warnings when something went wrong and returns null. something like: private static final Logger log = Logger.getLogger(Clazz.class.getName()); .... if (file == null || !file.exists()) { // if File not found log.warn("File not found: "+file.toString()); } else if (!file.canWrite()) { // if file is read only log.warn("File is read-only: "

Is Log4j being abandoned in favor of Slf4j? [closed]

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问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 6 years ago . It seems that log4j has some class loading issues (among others) and it seems to me the trend is to move out of log4j toward slf4j. (Hibernate stopped using the first in favor of the latter) Is it true? What are the main issues in log4j that slf4j solves? Is slf4j the final