I am trying to use SLF4J (with log4j binding) for the first time. I would like to configure 3 different named Loggers that can be returned by a LoggerFactory which will log different levels and push the messages to different appenders: Logger 1 “FileLogger” logs DEBUG and appends to DailyRollingFileAppender Logger 2 “TracingLogger” logs TRACE+ … Read more
What is the hierarchy of log4j logging? DEBUG INFO WARN ERROR FATAL Which one provides the highest logging which would be helpful to troubleshoot issues? Can any one provide the order or hierarchy in which logging take place from highest to lowest? Thanks! 9 Answers 9
I’d like to stop various messages that are coming on spark shell. I tried to edit the log4j.properties file in order to stop these message. Here are the contents of log4j.properties # Define the root logger with appender file log4j.rootCategory=WARN, console log4j.appender.console=org.apache.log4j.ConsoleAppender log4j.appender.console.target=System.err log4j.appender.console.layout=org.apache.log4j.PatternLayout log4j.appender.console.layout.ConversionPattern=%d{yy/MM/dd HH:mm:ss} %p %c{1}: %m%n # Settings to quiet third party … Read more
I am using Log4J in my application for logging. Previously I was using debug call like: Option 1: logger.debug(“some debug text”); but some links suggest that it is better to check isDebugEnabled() first, like: Option 2: boolean debugEnabled = logger.isDebugEnabled(); if (debugEnabled) { logger.debug(“some debug text”); } So my question is “Does option 2 improve … Read more
After adding log4j to my application I get the following output every time I execute my application: log4j:WARN No appenders could be found for logger (slideselector.facedata.FaceDataParser). log4j:WARN Please initialize the log4j system properly. It seems this means a configuration file is missing. Where should this config file be located and what is a good start … Read more
I have put log4j to my buildpath, but I get the following message when I run my application: log4j:WARN No appenders could be found for logger (dao.hsqlmanager). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. What do these warnings mean? Whats the appender here? 32 Answers 32 This Short introduction … Read more
Those messages are something tricky, enough so that people created this to make it clearer: https://issues.apache.org/bugzilla/show_bug.cgi?id=25747 What’s tricky about them is that the warnings are written if Log4j can’t find its log4j.properties (or log4j.xml) file, but also if the file is fine and dandy but its content is not complete from a configuration point of view. The following paragraph … Read more
Alright, so I got it working by changing this log4j.rootLogger=DebugAppender to this log4j.rootLogger=DEBUG, DebugAppender Apparently you have to specify the logging level to the rootLogger first? I apologize if I wasted anyone’s time. Also, I decided to answer my own question because this wasn’t a classpath issue.
By default, a logger inherits the appenders from its ancestors. By setting additivity=”false”, you prevent this behaviour. In your example, there may be appenders associated with com.mypage.glass or com.mypage or even the root logger that would be inherited if you don’t set that property to false.
Use this if your code or some libraries you are using uses Log4j directly, but you want to use a different SLF4J binding than Log4j. It will route the Log4j API calls to SLF4J to the binding you choose. You need to remove the Log4j library from your classpath and replace it with this dependency. Use … Read more
