log4j

Log4J loggers for different classes

由 故事扮演 提交于 2019-12-30 12:39:24
问题 I want to use Log4J for logging my java projects. I created a log4j.properties file in the src directory with the following content: # Root logger option log4j.rootLogger=INFO, file, stdout log4j.logger.DEFAULT_LOGGER=INFO,file2 # Direct log messages to a log file log4j.appender.file=org.apache.log4j.FileAppender log4j.appender.file.File=file.log log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d [%t] %-5p %c - %m%n # Direct log messages

transmittable-thread-local在slf4j中解决MDC线程池中上下文传递

由 别说谁变了你拦得住时间么 提交于 2019-12-30 11:08:04
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> transmittable-thread-local以下简称：TTL 根据InheritableThreadLocal在线程池中上下文传递的问题可以知道这个threadLocal的值传递，在父子线程之间若使用了线程池的技术，会导致子线程的threadLocal信息错乱。 根据分布式追踪系统场景下，如何使用TTL 知道ttl的实现原理，通过线程池的封装，threadLocal的继承实现了traceId的传递，采用weakHashMap取代引用计数的方法实现了GC的回收防止内存泄漏。 以下具体问题具体分析，给出的是以agent方式代码无侵入接入 TTL描述了四种场景 分布式跟踪系统 日志收集记录系统上下文 Session级Cache 应用容器或上层框架跨应用代码给下层SDK传递信息 分布式跟踪系统 snowball-common里的traceId是不是TTL推荐的分布式追踪系统场景下，如何使用TTL ，根据issue的描述，文章讲的是分布式追踪相关的设计和ttl在其中的应用，而在snowball-common的问题里，是关于slf4j的MDC问题，若继续探究请进入：APM 模块 日志收集记录系统 根据InheritableThreadLocal在线程池中上下文传递的问题

Converting log4j.properties to log4j.xml [duplicate]

由 馋奶兔 提交于 2019-12-30 10:43:29
问题 This question already has answers here : Script to convert log4j.properties to log4j.xml (4 answers) Closed 5 years ago . I couldn't find anywhere how to specify constants in log4j.xml. For example, I have this constant in my log4j.properties: #Log directory dal.log.dir=/var/log/pojodal/ # Log filename dal.log.file=pojodal.log And I use these constants as follows, in other parts of the properties file: log4j.appender.DRFA1.File=${dal.log.dir}/${dal.log.file} How to achieve the same behavior

How can I set up separate streams of logging for log4j?

由 拜拜、爱过 提交于 2019-12-30 09:51:41
问题 Say I have a class like this: public class MyClass { private Logger log = LoggerFactory.getLogger(MyClass.class); //org.slf4j.LoggerFactory public void foo(Params p) { log.info("Foo params: " + p); long t1 = System.currentTimeMillis(); Result r = someMethod(p); long t2 = System.currentTimeMillis(); log.info("Foo result: " + r) log.info("Foo time taken: + (t2-t1)/1000); } } Now when it comes to printing this info, I want to be able to turn on and off the different types of info (Parameters,

How to solve the warnings in log4j???Continuable parsing error…The content of element type “log4j:configuration” must match

由 我们两清 提交于 2019-12-30 08:06:10
问题 Warnings are shown ... log4j:WARN Continuable parsing error 28 and column 23 log4j:WARN The content of element type "log4j:configuration" must match "(renderer*,appender*,(category|logger)*,root?,categoryFactory?)". when execute the java files <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration> <appender name="console" class="org.apache.log4j.ConsoleAppender"> <layout class="org.apache.log4j.PatternLayout"> <param name=

log4j performance

由 左心房为你撑大大i 提交于 2019-12-30 08:03:11
问题 I'm developing a web app, and I'd like to log some information to help me improve and observe the app. (I'm using Tomcat6) First I thought I would use StringBuilders, append the logs to them and a task would persist them into the database like every 2 minutes. Because I was worried about the out-of-the-box logging system's performance. Then I made some test. Especially with log4j. Here is my code: Main.java public static void main(String[] args) { Thread[] threads = new Thread[LoggerThread

log4j performance

由 醉酒当歌 提交于 2019-12-30 08:02:12
问题 I'm developing a web app, and I'd like to log some information to help me improve and observe the app. (I'm using Tomcat6) First I thought I would use StringBuilders, append the logs to them and a task would persist them into the database like every 2 minutes. Because I was worried about the out-of-the-box logging system's performance. Then I made some test. Especially with log4j. Here is my code: Main.java public static void main(String[] args) { Thread[] threads = new Thread[LoggerThread

Please help me Filtering out Third Party Logging for Apache Log4j in my Java Application

由 旧巷老猫 提交于 2019-12-30 07:23:10
问题 I am using Third Party jars which are appending their own logs in my Java Application's Log file , I don't want to append those third party logs in my log file as it makes log file very clumsy and confusing. I know this method, log4j.logger.org.springframework.jdbc.core.JdbcTemplate=OFF to turn off the logging in this particular package org.springframework.jdbc.core.JdbcTemplate in my lo4j.properties, but the problem is I have many such jars added in my application and hence , want to avoid

log4j2 JDBC Appender Issue:Failed to Insert Record

由 廉价感情. 提交于 2019-12-30 06:52:08
问题 I have created a JDBC appender and bind the ColumnConfig and DataSourceConnectionSource . while trying to insert record in the DB (Logger.debug("Test")).I am getting below exception. Thanks [6/16/14 18:44:58:647 GMT-08:00] 00000024 SystemErr R ERROR StatusLogger An exception occurred processing Appender JDBCAppender org.apache.logging.log4j.core.appender.AppenderLoggingException: Failed to insert record for log event in JDBC manager: DSRA1300E: Feature is not implemented: PreparedStatement

how to change the htmllayout in log4j

由 ≡放荡痞女 提交于 2019-12-30 06:21:29
问题 i want to change the htmllayout (the 5 column - Time, Thread, Level, Category, Message) of log4j in Java. my log4j.properties is: log4j.rootLogger=DEBUG, Console, File log4j.appender.Console=org.apache.log4j.ConsoleAppender log4j.appender.File=org.apache.log4j.FileAppender log4j.appender.File.File =${logfilename} log4j.appender.Console.layout=org.apache.log4j.PatternLayout log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p %c %x - %m%n log4j.appender.File.layout=org.apache.log4j
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