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I have the following two packages: com.mycorp.project.first com.mycorp.project.second I'd like to configure Log4J (SLF4J) to write the logs from one package to one file, and from the other package to a second file. I do not want them to be mixed in together. To be clear, this is one project/one process running. I've tried filtering and with loggers but they seem to be ignored by log4j. Both files are always identical. Edit: Thank you for the answers so far, this is what I've got and it's not working. Both output files are identical. <configuration debug="true"> <contextName>dev</contextName> <appender name="FIRST_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>A:/dev/LogTesting/logs/first.log</file> <filter class="ch.qos.logback.classic.filter.ThresholdFilter"> <level>INFO</level> </filter> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>A:/dev/LogTesting/logs/first.%d{yyyyMMdd}%d{_HHmmss,aux}.log.gz</fileNamePattern> </rollingPolicy> <encoder> <pattern>%d{MMM dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern> </encoder> </appender> <appender name="SECOND_FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>A:/dev/LogTesting/logs/second.log</file> <filter class="ch.qos.logback.classic.filter.ThresholdFilter"> <level>INFO</level> </filter> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <fileNamePattern>A:/dev/LogTesting/logs/second.%d{yyyyMMdd}%d{_HHmmss,aux}.log.gz</fileNamePattern> </rollingPolicy> <encoder> <Pattern>%d{MMM dd HH:mm:ss.SSS} %property{HOSTNAME} [%thread] %level %logger{36} %m

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