How to conditionally add text from MDC on a LOG4J pattern?
There is a %notEmpty pattern in Log4j2 which allows you to achieve exactly this. %d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L – %notEmpty{client=%X{client} }%m%n
log4j
log4j basic configuration
I think the simplest way would be: Logger.getRootLogger().setLevel(Level.INFO);
why do we need root and logger in log4j.xml
It is enough. In log4j a logger is associated with a package or sometimes with a particular class. Package/class of a logger is defined by the attribute “name”. A logger logs messages in its package and also in all the child packages and their classes. The only exception is the root logger that logs messages … Read more
log4j.properties vs log4j.xml
Have a look at the JavaDoc. The documentation of the PropertyConfiguratorClass (log4j.properties) points out that The PropertyConfigurator does not handle the advanced configuration features supported by the DOMConfigurator such as support custom ErrorHandlers, nested appenders such as the AsyncAppender, etc. So the DOMConfigurator (log4j.xml) offers advanced options. Beside that you can have (at least a … Read more
Where to place log4j.xml
It finds the log4j.xml using the CLASSPATH. If log4j doesn’t find any config file, it will send an error to the console. If you don’t see any such error then it is likely that it is finding a config file which may not be the one you are editing. There is a command-line option to … Read more
Log4j : Multiple loggers, levels and appenders
This problem can be solved in two parts. 1. Prevent duplicate log messages The log messages were written twice because we listed the FOO appender in both the rootLogger and the log4j.logger.foobar category. So we must remove the appender and only define the logging level in category: log4j.rootLogger = WARN, FOO, BAR log4j.logger.foobar = INFO … Read more
How to log Apache CXF Soap Request and Soap Response using Log4j?
You need to create a file named org.apache.cxf.Logger (that is: org.apache.cxf file with Logger extension) under /META-INF/cxf/ with the following contents: org.apache.cxf.common.logging.Log4jLogger Reference: Using Log4j Instead of java.util.logging. Also if you replace standard: <cxf:bus> <cxf:features> <cxf:logging/> </cxf:features> </cxf:bus> with much more verbose: <bean id=”abstractLoggingInterceptor” abstract=”true”> <property name=”prettyLogging” value=”true”/> </bean> <bean id=”loggingInInterceptor” class=”org.apache.cxf.interceptor.LoggingInInterceptor” parent=”abstractLoggingInterceptor”/> <bean id=”loggingOutInterceptor” … Read more
Is there a log file analyzer for log4j files? [closed]
(disclaimer: I’m one of the developers contributing to Chainsaw V2) Chainsaw V2 can provide some of the functionality you’re looking for through its support for custom expressions and the ability to use those expressions to colorize, search and filter events. You -can- load multiple log files into Chainsaw (by default, all events for a log … Read more
How can I get log4j to delete old rotating log files?
RollingFileAppender does this. You just need to set maxBackupIndex to the highest value for the backup file.
How to initialize log4j properly?
Log4j by default looks for a file called log4j.properties or log4j.xml on the classpath. You can control which file it uses to initialize itself by setting system properties as described here (Look for the “Default Initialization Procedure” section). For example: java -Dlog4j.configuration=customName …. Will cause log4j to look for a file called customName on the … Read more