This is a rehashed version my answer to the question “Best practices for using Markers in SLF4J/Logback”. Markers can be used to color or mark a single log statement. What you do with these colors, i.e. markers, is entirely up to you. However, two patterns seem to be common for marker usage. Triggering: Some appender … Read more
First, as @darioo said: MDC is used for associating multiple events with few “entities” [Markers] are used for “special” events that you want to have filtered from usual ones So your assertion that You want to use MDC for this. Markers are for highlighting “special” events–filtering, if you will–rather than “slicing”. For example, you might … Read more
In addition to having Lombok plugin installed, also make sure that the “Enable annotation processing” checkbox is ticked under: Preferences > Compiler > Annotation Processors Note: starting with IntelliJ 2017, the “Enable Annotation Processing” checkbox has moved to: Settings > Build, Execution, Deployment > Compiler > Annotation Processors
It’s very possible to do something like this in logback. Here’s an example configuration: <?xml version=”1.0″?> <configuration> <appender name=”FILE” class=”ch.qos.logback.core.FileAppender”> <file>logfile.log</file> <append>true</append> <encoder> <pattern>%-4relative [%thread] %-5level %logger{35} – %msg %n</pattern> </encoder> </appender> <appender name=”ANALYTICS-FILE” class=”ch.qos.logback.core.FileAppender”> <file>analytics.log</file> <append>true</append> <encoder> <pattern>%-4relative [%thread] %-5level %logger{35} – %msg %n</pattern> </encoder> </appender> <!– additivity=false ensures analytics data only goes to … Read more
Go ahead: program to the log4j2 API instead of slf4j It’s safe: the Log4j2 API offers the exact same guarantees as slf4j – and more. Now that Log4j2 itself is separated into an API and an implementation module, there is no longer any value in using SLF4J. Yes, it is good engineering practice to keep … Read more
Yes, this is a common problem I’ve run into as well. There are a few workarounds (like manually setting it, as described), but ideally you want a solution that Sets the MDC consistently; Avoids tacit bugs where the MDC is incorrect but you don’t know it; and Minimizes changes to how you use thread pools … Read more
You can add/remove Appender programmatically to Log4j: ConsoleAppender console = new ConsoleAppender(); //create appender //configure the appender String PATTERN = “%d [%p|%c|%C{1}] %m%n”; console.setLayout(new PatternLayout(PATTERN)); console.setThreshold(Level.FATAL); console.activateOptions(); //add appender to any Logger (here is root) Logger.getRootLogger().addAppender(console); FileAppender fa = new FileAppender(); fa.setName(“FileLogger”); fa.setFile(“mylog.log”); fa.setLayout(new PatternLayout(“%d %-5p [%c{1}] %m%n”)); fa.setThreshold(Level.DEBUG); fa.setAppend(true); fa.activateOptions(); //add appender to any … Read more
It’s either through system property -Dorg.slf4j.simpleLogger.defaultLogLevel=debug or simplelogger.properties file on the classpath see https://www.slf4j.org/api/org/slf4j/simple/SimpleLogger.html for details
Resolved by adding the following exclusion in the dependencies (of pom.xml) that caused conflict. <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> </exclusions>
As of SLF4J 1.6.0, in the presence of multiple parameters and if the last argument in a logging statement is an exception, then SLF4J will presume that the user wants the last argument to be treated as an exception and not a simple parameter. See also the relevant FAQ entry. So, writing (in SLF4J version … Read more