Camel Log EIP does not log to configured log file

Issue

Using a custom OPS4J configuration I expect all logging coming from Camel to go into a separate log file, however logging from the Camel Log Enterprise Integration Pattern (EIP) does not get written to that custom log file but instead appears in the default data/log/fuse.log.

The Camel route uses the Camel Log EIP as follows:

<camelContext xmlns="http://camel.apache.org/schema/blueprint" id="..." >
  <route id="..." >
    <from uri="activemq:queue:jms-localtx-demo.in" />
    <log message="Processing message from queue jms-localtx-demo.in." />
     ...
  </route>
</camelContext>

The OPS4J logging configuration in $FUSE_HOME/etc/org.ops4j.pax.logging.properties uses

# relevant Log4J Appender configuration
log4j.appender.appLog = org.apache.log4j.RollingFileAppender
log4j.appender.appLog.file = /opt/rh/jboss-fuse-6.3.0.redhat-310/data/log/appLog.log
log4j.appender.appLog.append = true
...

# Log4J log level configuration
log4j.logger.org.apache.camel = INFO, appLog
log4j.additivity.org.apache.camel = false

It configures all logging for package org.apache.camel to only go into log file data/log/appLog.log.