From the SLF4JBridgeHandler docs and testing (annotated with brackets): [ALL -> TRACE] FINEST -> TRACE FINER -> DEBUG FINE -> DEBUG [CONFIG -> INFO] INFO -> INFO WARNING -> WARN SEVERE -> ERROR [OFF -> ERROR]
See this tutorial on jul: java -Djava.util.logging.config.file=myLoggingConfigFilePath But I would recommend to go for Logback Also see an official “Java logging overview”.
I’ll try to put my two cents from another perspective What is exactly the benefit of parametrized logging? You just defer toString() invocation and string concatenation until really needed, which is when you really have to log the message. This optimizes performance when that particular logging operation is disabled. Check source code for SLF4J if … Read more
SLF4J – version 2 Version 2 of SLF4J has support for lambda syntax. This new version also brings a fluent API. Version 2 is now the current generation of SLF4J. Latest release is 2.0.6 as of 2023-01. Requires Java 8 or later. Maven POM setting: <!– https://mvnrepository.com/artifact/org.slf4j/slf4j-api –> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>2.0.6</version> </dependency> See the … Read more
And for Spring Boot 2 you can add in your application.properties: logging.level.org.springframework.cache=TRACE
In addition to Jatin’s answer: Spring uses Jakarta Commons Logging as a logging API. In order to log to slf4j, you need to make sure commons-logging is not on the classpath. jcl-over-slf4j is a replacement jar for commons-logging. If you’re using maven, you can detect where commons-logging comes from using mvn dependency:tree and exclude it … Read more
Here is one obvious problem with this approach: the String messages will be constructed on each call to debug(), there is no obvious way to use a guard clause with your wrapper. The standard idiom with log4j/commons-logging/slf4j is to use a guard clause such as: if (log.isDebugEnabled()) log.debug(“blah blah blah”); With the purpose being that … Read more
Excuse I used this thing and I forgot it wasn’t the Apache version. It’s actually open-source and part of a project called common infrastructure. It is also called common logging. It works with MS Enterprise, log4net and others. It works well.
You’re creating a call-loop with log4j-slf4j-impl-2.3.jar and log4j-to-slf4j-2.3.jar. log4j-slf4j-impl-2.3.jar is the implementation of the adapter that sends slf4j calls to log4j. log4j-to-slf4j-2.3.jar is sending log4j calls right back to slf4j. Remove this one.
Slf4j is indeed just a logging facade. However, Log4j is intended to be succeeded by Logback, from the very same authors. Update: if you’d like to know about another benefit of Slf4j, it’s the fact that following (ugly) constructs aren’t needed anymore to avoid the toString() unnecessarily been called: if (logger.isDebugEnabled()) { logger.debug(“Message: ” + … Read more