logback logs exceptions to localhost.log instead of the specified file

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I have SLF4J v1.7.7 and logback-classic 1.1.2 in a web app deployed to tomcat 8.0.8 on java 8 Some of my logs properly go to the FileAppender I configured in the logback.xml, others though go to tomcat's localhost.yyyy-MM-dd.log This behaviour is very annoying during development and will be unacceptable in the production environment.

Here is the logback.xml

<configuration>
    <appender name="fileappender" class="ch.qos.logback.core.FileAppender">
        <file>/var/log/tomcat/mywebapp.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>api.%d{yyyy-MM-dd}.%i.log.xz</fileNamePattern>
            <timeBasedFileNamingAndTriggeringPolicy
                    class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">
                <maxFileSize>50MB</maxFileSize>
            </timeBasedFileNamingAndTriggeringPolicy>
        </rollingPolicy>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>
    <appender name="async" class="reactor.logback.AsyncAppender">
        <appender-ref ref="fileappender"/>
    </appender>
    <root level="info">
        <appender-ref ref="async"/>
    </root>
</configuration>

What am I doing wrong?

asked 36 secs ago

Czar

46