Answer by Tilman Hausherr for Disable PDFBox logging with Springboot org.apache.commons.logging

Here's what I have been using in the "old" log4j log4j.properties file (you should migrate to log4j2):

log4j.logger.org.springframework=WARN
log4j.logger.org.apache.pdfbox.pdmodel.font.PDCIDFontType2=FATAL

In the "new" log4j2.xml I have this (the appenders are named STDOUT and A1):

<?xml version="1.0" encoding="UTF-8"?>
<!-- https://logging.apache.org/log4j/2.x/manual/configuration.html 
     https://logging.apache.org/log4j/2.x/manual/appenders.html
-->
<Configuration>
    <Appenders>
        ....
        ....
    </Appenders>
    <Loggers>
        <Logger name="org.springframework" level="warn" additivity="false">
            <AppenderRef ref="STDOUT"/>
            <AppenderRef ref="A1"/>
        </Logger>
        <Logger name="org.apache.pdfbox.pdmodel.font.PDCIDFontType2" level="fatal" additivity="false">
            <AppenderRef ref="STDOUT"/>
            <AppenderRef ref="A1"/>
        </Logger>
        <Root level="info">
            <AppenderRef ref="STDOUT"/>
            <AppenderRef ref="A1"/>
        </Root>
    </Loggers>
</Configuration>