log4j

Exception depth in log4j

由 ↘锁芯ラ 提交于 2019-12-08 17:24:44
问题 Im getting in instantiation exception inf our Myfaces 2 application. But the exception printing through log4j is cutting off the rest of the stacktrace. Here is what I am seeing: javax.faces.FacesException: java.lang.InstantiationException at org.apache.myfaces.config.ManagedBeanBuilder.buildManagedBean(ManagedBeanBuilder.java:240) at org.apache.myfaces.el.unified.resolver.ManagedBeanResolver.createManagedBean(ManagedBeanResolver.java:303) at org.apache.myfaces.el.unified.resolver

Benefits of Log4j singleton wrapper?

由 纵饮孤独 提交于 2019-12-08 17:11:26
问题 I have recently inherited some Java code and need to integrate it into a project that I am working on. My project is a service agent that processes and transforms XML messages. While looking through the new code, I discovered the following logging class: import org.apache.log4j.BasicConfigurator; import org.apache.log4j.Level; import org.apache.log4j.Logger; public class MyLogger { private static MyLogger instance = null; protected final static Logger log = Logger.getLogger(MyLogger.class);

Log4j2 using {} against using %d or %s

由 老子叫甜甜 提交于 2019-12-08 17:05:27
问题 In Log4j2, are both the following equally efficient and do not cause any string concatenation with a log level more specific than DEBUG ? And for any reason/situation will one be preferred over other ? log.warn(String.format("Number of cars : %d",carCount)); log.warn("Number of cars : {}",carCount ); And does {} works with any type of Object ? 回答1: The {} notation is much more efficient than the %s %d String format notation. (There are benchmarks for this, I'll add some numbers later.) The {}

Duplicate log entries log4j

由 自古美人都是妖i 提交于 2019-12-08 16:53:28
问题 I am getting duplicate entries in my log file. Have attached my log4j.properties below. log4j.properties: ############################################################################### # log4j Configuration file: Defines following loggers # SL - Standard root Logger # EL - Error Logger with the threshold level explicitly set to ERROR # DL - Data base logger - to log db queries separately # BL - Batch logger ############################################################################### log4j

Log4j database appender

由 你。 提交于 2019-12-08 16:18:39
问题 I want log4j to log my errors in a MySql database, but the official documentation on this is pretty sparse (why?). Anyway, here's my attempt at a log4j.xml config file: <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> <appender name="jdbcAppender" class="org.apache.log4j.jdbc.JDBCAppender"> <param name="URL" value="jdbc:mysql://my_host/my_database" /> <param name="Driver" value="com.mysql.jdbc.Driver" /> <param name="User" value="my_user_name" /> <param name="Password"

Log4J - SiftingAppender-like functionality

由 半世苍凉 提交于 2019-12-08 15:53:56
问题 I work in a project that uses Log4J. One of the requirement is to create a separate log file for each thread; this itself was a odd issue, somewhat sorted by creating a new FileAppender on the fly and attaching it to the Logger instance. Logger logger = Logger.getLogger(<thread dependent string>); FileAppender appender = new FileAppender(); appender.setFile(fileName); appender.setLayout(new PatternLayout(lp.getPattern())); appender.setName(<thread dependent string>); appender.setThreshold

log4j: Standard way to prevent repetitive log messages?

由 我是研究僧i 提交于 2019-12-08 15:27:16
问题 Our production application logs an error when it fails to establish a TCP/IP connection. Since it is constantly retrying the connection, it logs the same error message over and over. And similarly, other running components in the application can get into an error loop if some realtime resource is unavailable for a period of time. Is there any standard approach to controlling the number of times the same error gets logged? (We are using log4j, so if there is any extension for log4j to handle

How to properly create a RollingFileAppender with AppenderComponentBuilder in log4j 2

由 拟墨画扇 提交于 2019-12-08 14:12:26
I would like the user to choose the type of the appender(s) that will be created via a configurable option. For example, let's say that I have a command line argument that controls the type of the appenders that will be created for that process. The user can choose one of these values: file,syslog, or both. I would like to do this in a programmatic way, rather than using an external xml configuration file. This is a simplified version of my attempt to create a logger with a syslog appender in a programmatic way. // simplified version of a method that creates and returns a logger // using

ClassNotFoundException while executing mapreduce program

由 这一生的挚爱 提交于 2019-12-08 13:36:08
问题 I was trying to execute the word count program in eclipse. But while executing the program I am getting the following error log4j:ERROR Could not instantiate class [org.apache.hadoop.log.metrics.EventCounter]. java.lang.ClassNotFoundException: org.apache.hadoop.log.metrics.EventCounter at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader

parsing log4j log file using regular expression

由 試著忘記壹切 提交于 2019-12-08 13:27:03
问题 I have created a java application for parsing the log4j log file using regular expression, The application is working fine for the log which i have shown below 1999-11-27 15:49:37,459 [thread-x] ERROR mypackage - Catastrophic system failure but not working for 2015-01-22 01:52:54,237 [http-bio-80-exec-5] FATAL TestLog4jServlet - Show FATAL message My log4j ConversionPattern is given below log4j.appender.Appender2.layout.ConversionPattern=%d [%t] %-7p %10c{1} - %m%n Can anyone please tell me
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