I am trying to deploy 2 servlets in glassfish with log4f library. I have no problems in tomcat. Each servlet writes in its own file but in tomcat, I found this guide https://blogs.oracle.com/naman/entry/configure_log4j_for_use_in to configure and support log4f library. I got the first servlet working with it. And it writes logs in its log file. But whenever I deploy the secod servlet, I don't see its logs. The first one keeps writing in its own file but the second one not. I modify the logback.xml file included in config folder to include both files and all packages but it seems to ignore it. This is my logback.xml file: <?xml version="1.0" encoding="UTF-8"?> <configuration> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <!-- encoders are assigned the type ch.qos.logback.classic.encoder.PatternLayoutEncoder by default --> <encoder> <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{5} - %msg%n</pattern> </encoder> </appender> <logger name="com.lordofthejars.foo" level="INFO" additivity="false"> <appender-ref ref="STDOUT" /> </logger> <appender name="SERVER-FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <!-- daily rollover -->0 <fileNamePattern>/root/glassfish4/glassfish/domains/domain1/logs/serverregister-%d{yyyy-MM-dd}.%i.log</fileNamePattern> <!-- keep 7 days' worth of history --> <maxHistory>7</maxHistory> <TimeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"> <MaxFileSize>512MB</MaxFileSize> </TimeBasedFileNamingAndTriggeringPolicy> </rollingPolicy> <append>true</append> <encoder> <pattern>%d{dd-MM-yyyy HH:mm:ss.SSS} [%p] %logger{5}:%L - %msg%n</pattern> </encoder> </appender> <appender name="REGMAN-FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <!-- daily rollover --> <!--<fileNamePattern>${catalina.home}/logs/registermanager-%d{yyyy-MM-dd}.%i.log</fileNamePattern>--> <fileNamePattern>/root/glassfish4/glassfish/domains/domain1/logs/registermanager-%d{yyyy-MM-dd}.%i.log</fileNamePattern> <!-- keep 7 days' worth of history --> <maxHistory>7</maxHistory> <TimeBasedFileNamingAndTriggeringPolicy class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP"> <MaxFileSize>512MB</MaxFileSize> </TimeBasedFileNamingAndTriggeringPolicy> </rollingPolicy> <append>true</append> <encoder> <pattern>%d{dd-MM-yyyy HH:mm:ss.SSS} [%p] %logger{5}:%L - %msg%n</pattern> </encoder> </appender> <logger name="com.eu.iotapi.handlers.AuthenticationGatewayHandler" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.handlers.AuthenticationHandler" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.handlers.DeviceValidationHandler" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.handlers.EventValidationHandler" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.handlers.GatewayValidationHandler" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.handlers.ObservationValidationHandler" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.resources.PublicationsResource" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.resources.RegisterDeviceOnBackground" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.resources.RegisterGatewayOnBackground" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.resources.RegistrationResource" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.resources.SubmitEventOnBackground" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.resources.SubmitObservationOnBackground" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.uns.device.RegisterDeviceHandler" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.uns.events.SubmitEventsHandler" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.uns.device.RegisterGatewayHandler" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.uns.observations.SubmitObservationsHandler" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.iotapi.resources.DeviceTranslator" level="DEBUG" additivity="false"> <appender-ref ref="SERVER-FILE"/> </logger> <logger name="com.eu.registermanager.eventbroker.device.registration.DeviceRegistrationHandler" level="DEBUG" additivity="false"> <appender-ref ref="REGMAN-FILE"/> </logger> <logger name="com.eu.registermanager.eventbroker.gateway.GatewayRegistrationHandler" level="DEBUG" additivity="false"> <appender-ref ref="REGMAN-FILE"/> </logger> <logger name="com.eu.registermanager.handlers.AuthenticationGatewayHandler" level="DEBUG" additivity="false"> <appender-ref ref="REGMAN-FILE"/> </logger> <logger name="com.eu.registermanager.handlers.AuthenticationHandler" level="DEBUG" additivity="false"> <appender-ref ref="REGMAN-FILE"/> </logger> <logger name="com.eu.registermanager.resources.RegisterDeviceOnEventBrokerOnBackground" level="DEBUG" additivity="false"> <appender-ref ref="REGMAN-FILE"/> </logger> <logger name="com.eu.registermanager.resources.RegisterGatewayOnEventBrokerOnBackground" level="DEBUG" additivity="false"> <appender-ref ref="REGMAN-FILE"/> </logger> <logger name="com.eu.registermanager.resources.RegisterResource" level="DEBUG" additivity="false"> <appender-ref ref="REGMAN-FILE"/> </logger> <root level="INFO"> <appender-ref ref="STDOUT" /> </root> </configuration>