How to override logback default variable using command line

Question

I have following variable in logback-sring.xml and I want to override its default value using value supplied in command line.

<property name="log_root" value="${log.root:-logapp/logs}"/>
 <appender name="file" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>${log_root}/app.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>${log_root}/archived/app.%d{yyyy-MM-dd}.log</fileNamePattern>
            <!-- keep 30 days worth of history, but at most 1GB -->
            <totalSizeCap>1GB</totalSizeCap>
            <maxHistory>30</maxHistory>
        </rollingPolicy>
        <encoder>
            <pattern>%level %d [%thread] %logger{15} - %msg %ex{2}%nopex%n</pattern>
        </encoder>
    </appender>

I tried to override the value during the jar call:

java -jar app.jar -Dlog.root=logappv2/logs

But the app always use the default log.root value. What is possibly the cause?

Please include the part of logback-spring.xml referring log_root — samabcde
– samabcde, Commented Dec 18, 2023 at 14:10

samabcde · Accepted Answer · 2023-12-19 03:04:23Z

1

You should put -Dlog.root=logappv2/logs before -jar, like.

java -Dlog.root=logappv2/logs -jar app.jar

Reference: Proper usage of Java -D command-line parameters

answered Dec 19, 2023 at 3:04

samabcde

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Hskctity · Accepted Answer · 2023-12-18 09:39:39Z

0

This is the variable you are passing via command line ${log.root} but I do not see its usage.

answered Dec 18, 2023 at 9:39

Hskctity

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1 Comment

of32 inc Over a year ago

i have added the usage

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