log4j

How to create multiple log files using log4j

由 江枫思渺然 提交于 2019-12-20 06:12:43
问题 I want to create separate log file one for info another for debug, I am using below log4j.property file, Please suggest how to modify for two level logging in different file, # Root logger option log4j.rootLogger=info, file # Direct log messages to a log file log4j.appender.file=org.apache.log4j.RollingFileAppender log4j.appender.file.File=infoLog.log log4j.appender.file.MaxFileSize=10MB log4j.appender.file.MaxBackupIndex=10 log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j

How to keep single file and overwrite the contents in the same file using log4cxx?

由 杀马特。学长 韩版系。学妹 提交于 2019-12-20 04:54:39
问题 In my application , Multiple threads log the data in the same file .if the file size exceeds the limit , then i have to delete the particular record in file and move every contents upwards. can I do this in Log4cxx?if so ,reply your thoughts.. Thanks.. 回答1: This sample will solve your problem : log4j.rootLogger=debug, stdout, R log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.layout=org.apache.log4j.PatternLayout # Pattern to output the caller's file name and line

Log4j详细介绍(二)----Commons-logging控件

由 筅森魡賤 提交于 2019-12-20 03:33:09
　　除了Log4j还有一种选择是使用commons-logging。commons-logging是Apache commons类库中的一员。Apache commons类库是一个通用的类库,提供了基础的功能,例如commons-fileupload,commons-httpclient,commons-io,commons-codec等 　　commons-logging能够选择使用Log4j还是JDK Logging，但不依赖与Log4j,JDK logging的API。如果项目的classpath中包含log4j的类库，则使用Log4j,否则使用JDK Logging，使用commons-logging能够灵活地选择使用哪种日志方式,而不需要修改源代码。 　　commons-logging的使用类似于Log4j,它们的级别以及使用规则完全一样的,例如: 1 import org.apache.commons.logging.Log; 2 import org.apache.commons.logging.LogFactory; 3 4 public class CommonsLoggingTest { 5 6 public static Log log = LogFactory.getLog(CommonsLoggingTest.class); 7 8 public

How do I configure log4j to send log events to java.util.logging using JULAppender?

由 纵饮孤独 提交于 2019-12-20 03:21:49
问题 I am familiar with the java.util.logging (JUL) framework, I use it extensively. Recently, I started using a library that does its logging through log4j. When I start my application I now get the following printed on the console: log4j:WARN No appenders could be found for logger (com.example.thirdparty.Library). log4j:WARN Please initialize the log4j system properly. It appears that log4j has a solution for this: JULAppender which will send everything logged with log4j to the logging framework

log4j JDBCAppender rotate table name

由 心不动则不痛 提交于 2019-12-20 03:03:40
问题 I have successfully configured an application that uses log4j for it's logging to log into a MySQL database. (Using org.apache.log4j.jdbc.JDBCAppender). I also have some perl applications that log into the database as well. My perl apps are setup so that the name of the database table changes every month (log_2010_11, log_2010_10 etc). At the end of each month, I run reporting scripts on the month just completed, dump the table to an external file (which gets compressed and archived), and

Limit message length in Log4J

由 ￣綄美尐妖づ 提交于 2019-12-20 02:48:11
问题 I'm working on an application that uses Log4J for logging. Occasionally, the application creates log messages that are very long, > 10000 characters. This causes performance problems when the log is displayed in a Console window in Eclipse. I want to limit the maximum message length, truncating long messages to the maximum length. How can I do that with Log4J? 回答1: You can use a PatternLayout with a ConversionPattern that has a 'maximum width' format modifier on the message conversion

How to rotate a log4j log manually

由 谁都会走 提交于 2019-12-20 02:04:16
问题 I have log4j configured to rotate the log every day. In special situations I would like to trigger an additional log rotation manually. Is this possible - and if so: How? Solved like this: void rolloverLogs() { for(final Enumeration<?> loggers = LogManager.getCurrentLoggers(); loggers.hasMoreElements(); ) { final Logger logger = (Logger) loggers.nextElement(); for (final Enumeration<?> appenders = logger.getAllAppenders(); appenders.hasMoreElements(); ) { final Appender a = (Appender)

Log4j email error “Cannot find java.home ??”

由 一世执手 提交于 2019-12-20 01:37:59
问题 I'm using log4j under J2SE. I've configured it to use a mailer for a certain type of log event.. When the logger.error triggers I get the following exception: java.lang.Error: Can't find java.home ?? at sun.net.NetProperties.loadDefaultProperties(NetProperties.java:45) ... at org.apache.log4j.net.SMTPAppender.sendBuffer(SMTPAppender.java:416) Anyone run into this before? I have the required mail.jar library included as well. Any help is appreciated. Thanks, Chris 回答1: I looked at the source

Commons-logging + Log4j

由 ∥☆過路亽．° 提交于 2019-12-19 23:36:00
一、Commons-logging能帮我们做什么？ 1、提供一个统一的日志接口，简单了操作，同时避免项目与某个日志实现系统紧密耦合 2、自动选择适当的日志实现系统 　　a.classpath下查找commons-logging.properties 　　b.classpath下查找Log4j的包 　　c.使用JDK自身的日志实现类(注:JDK1.4以后才有日志实现类) 　　d.使用commons-logging自身日志实现类SimpleLog 3、它甚至不需要配置 Commons-logging 的Java类的代码： package com.nadim.framework.monitor; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class Run { private static final Log log = LogFactory.getLog(Run.class); public static void main(String[] args) { //输出4种不同级别的日志 log.debug("111"); log.info("222"); log.warn("333"); log.error("444"); } } jar包地址

Log4j deadlock occuring between Logger and Appender

由 一曲冷凌霜 提交于 2019-12-19 20:50:42
问题 I am using a LogAppender class which extends a Console Appender and internally uses a Sendmail function to send mails if the log level is ERROR. (I know I could have used a SMPT appender for mailing, but this is how the infrastructure is so any please avoid any comments on this). My application is split into different threads, and the issue mentioned below happends sporadically.(But some observation tells me that it might be due to one thread taking more time to initalize). I get the
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