log4j2

问题 I'm trying to configure Tomcat 8 to use Log4j2 for logging. I've found this reference for Logging in Tomcat using Log4j. It provides a sample log4j.properties file that configures Log4j to match Tomcat's internal logging. Most of this looks pretty straightforward to convert for Log4j2, but the section at the end that maps loggers to appenders has me stumped: # Configure which loggers log to which appenders log4j.logger.org.apache.catalina.core.ContainerBase.[Catalina].[localhost] = INFO,

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

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

问题 How can I make Spring log properly via log4j2 along with the other dependencies I have (Hibernate, Netty, Mina, etc.)? I tried many different thins and dependency combinations. But I either can get Spring to log and nothing else, or everything but Spring. With all dependecies logging properly (but Spring) I get the following error: java.lang.NoSuchMethodError: org.apache.logging.log4j.core.config.ConfigurationFactory.getConfiguration(Lorg/apache/logging/log4j/core/config/ConfigurationSource;

问题 logger.setLevel() method is not available in log4j2 API. So how to set log level at run time. 回答1: I'm not sure if this is the best way, but you set the level on org.apache.logging.log4j.core.config.LoggerConfig which you can get from the LoggerContext via the LogManager. Once set, you can update the loggers with the new configuration. As an example: public static void main(String[] args) { Logger log = LogManager.getLogger(LogManager.ROOT_LOGGER_NAME); log.error("An error"); log.debug("A

问题 We have migrated all our code to use the slf4 API to use generic APIs, however now we are thinking of upgrading from log4j 1.x to log4j 2.x. Will we be able to use all the features of log4j2 if we use the slf4j API and log4j2 as the implementation? 回答1: The Log4j2 API is richer than the SLF4J API, and many Log4j2 API features are not accessible via SLF4J. See below for details. Features of the Log4j2 implementation, like Async Loggers, Lookups, Filters, Layouts and Appenders are controlled

问题 I'm trying to use an XML configuration file for Log4j2 that is embedded in my Java application, but is not working. The code: ConfigurationSource source = new ConfigurationSource(Main.class.getResourceAsStream("/in/gunbound/prelauncher/server/log4j2/log4j2.xml")); ConfigurationFactory factory = (ConfigurationFactory) XMLConfigurationFactory.getInstance().getConfiguration(source); ConfigurationFactory.setConfigurationFactory(factory); The error: Exception in thread "main" java.lang

问题 Using log4j2 (beta9) with java 1.7. My complete log4j2.xml: <?xml version="1.0" encoding="UTF-8"?> <Configuration> <Properties> <Property name="projectPrefix">Tts</Property> <Property name="rawPattern">%d %-5p [%t] %C{2} (%F:%L) - %m%n</Property> <Property name="coloredPattern">%d %highlight{%-5p}{FATAL=bright red, ERROR=red, WARN=yellow, INFO=cyan, DEBUG=green, TRACE=bright blue} %style{[%t] %C{2} (%F:%L) -}{bright,black} %m%n</Property> <Property name="fileName">Log/${projectPrefix}.log<

问题 Here is the challenge I'm facing: I have a servlet program. And I need to write logs for each user to the folder named after that user. Something like this: // stores message to David folder // /root_path/David/logfile.log logger.error(MarkerManager.getMarker("David"), "Error happened"); // stores message to Mark folder // /root_path/Mark/logfile.log logger.error(MarkerManager.getMarker("Mark"), "Something is broken"); In my example I used markers. But I don't really know whether markers

问题 I'd like a very simple XML configuration file with a console and a file appender using log4j2. (The Apache Website is killing me with much Information.) 回答1: <?xml version="1.0" encoding="UTF-8"?> <Configuration status="INFO"> <Appenders> <Console name="Console" target="SYSTEM_OUT"> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" /> </Console> <File name="MyFile" fileName="all.log" immediateFlush="false" append="false"> <PatternLayout pattern="%d{yyy-MM-dd HH:mm