I'm trying to use logback as my logger in my simple program but it does not work fine! I put logback/logback.xml and logback/Logback.java in the source directory logback and run through this command line - \logback>java -cp .;%CLASSPATH% Logback which the %CLASSPATH% is an environment variable that has the path of .jar file that logback needs like: - logback-access-1.1.2.jar - logback-classic-1.1.2.jar - logback-core-1.1.2.jar - slf4j-api-1.7.6.jar This is my logback.xml file <configuration> <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>test.log</file> <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy"> <fileNamePattern>tests.%i.log</fileNamePattern> <minIndex>1</minIndex> </rollingPolicy> <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy"> <maxFileSize>2MB</maxFileSize> </triggeringPolicy> <encoder> <pattern>%date %level [%thread] %logger{10} [%file:%line] %msg%n</pattern> </encoder> </appender> <root level="debug"> <appender-ref ref="FILE" /> </root></configuration> and there is my simple program import org.slf4j.Logger;import org.slf4j.LoggerFactory; public class Logback{ private final static Logger logger = LoggerFactory.getLogger(Logback.class); public static void main(String[] args){ for(int i=0;i<1000000;i++) logger.debug("hello"); }} but unfortunately i just receive log in the console instead of test.log files. it seems the logger object just use the default configuration!!! If i set the -Dlogback.configurationFile=logback.xml variable as below, it works properly. but how to run without this variable? - \logback>java -cp .;%CLASSPATH% -Dlogback.configurationFile=logback.xml Logback