Logback TimeBasedRollingPolicy not saving the log with the desired name of the log file - spring-boot

Question

I want to configure TimeBasedRollingPolicy in my spring boot project. I want the log file to be saved in a pattern 'mylog.%d{yyyy-MM-dd}.log'.
My logback-spring.xml file looks like the following:
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="Console"
class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %5p{${LOG_LEVEL_PATTERN}} %15.15t - %-80.80c{1.} %X{username} %X{ipaddress} : %msg%n</pattern>
</encoder>
</appender>
<appender name="RollingFile"
class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${catalina.base}/logs/mylog.log</file>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %5p{${LOG_LEVEL_PATTERN}} %15.15t - %-80.80c{1.} %X{username} %X{ipaddress} : %msg%n</pattern>
</encoder>
<rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${catalina.base}/logs/mylog.%d{yyyy-MM-dd}.log</fileNamePattern>
</rollingPolicy>
</appender>
<root level="INFO">
<appender-ref ref="Console" />
<appender-ref ref="RollingFile" />
</root>
</configuration>
But it's not working, the log file is created but it is not titled mylog but the default 'localhost_access_log.2022-05-16'. Can someone please help me with this?

Answer 1

Declare timestamp separately and refer it inside your fileNamePattern
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<timestamp key="timestamp" datePattern="yyyy-MM-dd"/>
// place all your appenders
<appender name="RollingFile"
.
.
.
<rollingPolicy
class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>${catalina.base}/logs/mylog.${timestamp}.log</fileNamePattern>
</rollingPolicy>
</appender>
</configuration>