Getting Started

Links

http://www.slf4j.org/

Maven

<dependency>
  <groupId>org.slf4j</groupId>
  <artifactId>slf4j-api</artifactId>
  <version>1.4.2</version>
</dependency>

Sample

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Wombat {

    private final Logger logger = LoggerFactory.getLogger(Wombat.class);

    Integer t;
    Integer oldT;

    public void setTemperature(Integer temperature) {
        oldT = t;
        t = temperature;

        logger.debug("Temperature set to {}. Old temperature was {}.", t, oldT);

        if(temperature.intValue() > 50) {
            logger.info("Temperature has risen above 50 degrees.");
        }
    }
}

log4j

To configure with log4j, follow these instructions, log4j

Simple

To configure in a very simple way, follow these instructions, Simple.

Issues

Failed to load class org.slf4j.impl.StaticLoggerBinder

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.

This error is reported when the org.slf4j.impl.StaticLoggerBinder class could not be loaded into memory. This happens when no appropriate SLF4J binding could be found on the class path. Placing one (and only one) of slf4j-nop.jar, slf4j-simple.jar, slf4j-log4j12.jar, slf4j-jdk14.jar or logback-classic.jar on the class path should solve the problem.