SLF4J with logback. Configuration, pom and example file to catch your dependencies logs also. Different log file for to catch error only

logback.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!-- Put this file into src/main/resources -->
<configuration>

    <contextName>WebContext</contextName>

    <jmxConfigurator/>

    <appender name="CONSOLE" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%p [%t] %c{1}.%M\(%L\) | %m%n</pattern>
        </encoder>
    </appender>

    <!-- This appender to catch all except trace -->
    <appender name="DEBUG_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>logback_example_debug.log</file>
        <append>true</append>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>logback_example_debug.log.%d{yyyy-MM-dd}.gz</fileNamePattern>
        </rollingPolicy>
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>DEBUG</level>
        </filter>
        <encoder>
            <pattern>%d{ISO8601} %-5p [%c{3}] \(%t:%X{}\) %m%n</pattern>
        </encoder>
    </appender>

    <!-- This appender to catch only errors -->
    <appender name="ERROR_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>logback_example_error.log</file>
        <append>true</append>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>logback_example_error.log.%d{yyyy-MM-dd}.gz</fileNamePattern>
        </rollingPolicy>

        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>ERROR</level>
        </filter>
        <encoder>
            <pattern>%d{ISO8601} %-5p [%c{3}] \(%t:%X{}\) %m%n</pattern>
        </encoder>
    </appender>

    <root>
        <level value="${logger.root.level}"/>
        <appender-ref ref="CONSOLE"/>
        <appender-ref ref="DEBUG_FILE"/>
        <appender-ref ref="ERROR_FILE"/>
    </root>

    <!-- Third Parties Logs -->
    <logger name="org.springframework">
        <level value="WARN"/>
    </logger>

    <logger name="com.github.gist">
        <level value="DEBUG"/>
    </logger>

</configuration>

LoggerExample.java

package com.github.gist;

import org.slf4j.Logger;  
import org.slf4j.LoggerFactory;  
public class LoggerExample {  
  public static void main(String[] args) {  
   Logger log = LoggerFactory.getLogger(LoggerExample.class);  
   log.debug("You are in main");  
  }  
}  

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>net.arulraj.example</groupId>
    <artifactId>logback-example</artifactId>
    <version>1.0</version>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <!-- LOG level -->
        <logger.root.level>DEBUG</logger.root.level>
        <logback.version>1.1.1</logback.version>
        <slf4j.version>1.7.5</slf4j.version>
    </properties>

    <dependencies>

        <!-- Logger -->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>${logback.version}</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jcl-over-slf4j</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>jul-to-slf4j</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>log4j-over-slf4j</artifactId>
            <version>${slf4j.version}</version>
        </dependency>

    </dependencies>
</project>

To know more about logback appenders, pattern layout and filters see the manual http://logback.qos.ch/manual/introduction.html