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SLF4J No Binding Example
What happens if I use slf4j-api-*.jar without any logging library to bind with?
✍: Guest
If you use slf4j-api-*.jar only, you will get a warning message. And all logging messages will be dropped as shown in this tutorial.
1. Write a simple Java program, Hello.java, to use SLF4J API:
// Copyright (c) FYIcenter.com import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class Hello { private static final Logger log = LoggerFactory.getLogger("fyiLog"); public static void main(String[] args) { System.out.println("Log class: "+log.getClass().getName()); log.error("Hello - error"); log.warn("Hello - warn"); log.info("Hello - info"); log.debug("Hello - debug"); log.trace("Hello - trace"); } }
2. Run Hello.java with slf4j-api-1.7.31.jar only.
$ java -version java version "15" 2020-09-15 $ java -cp slf4j-api-1.7.31.jar Hello.java SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder". SLF4J: Defaulting to no-operation (NOP) logger implementation SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details. Log class: org.slf4j.helpers.NOPLogger
3. Review the output:
⇒ SLF4J Binding to Simple Logger Example
⇐ Using slf4j-*.jar in Java Programs
2021-12-23, 758🔥, 0💬
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