How to disable request-level logging with the AWS Java SDK?

I'm trying to disable request level logging by the AWS Java SDK with Tomcat 8 on Linux. It's a fresh installation of tomcat 8 and my test servlet (which works) just prints to standard out, which by default goes to /var/log/tomcat8/catalina.out.

I'd like to disable the request level logging like - Sending Request... by the AWS SDK, so I've tried adding the following to my logging config at /usr/share/tomcat8/conf/logging.properties:

log4j.logger.com.amazonaws = WARN
log4j.logger.org.apache.http.wire = WARN
log4j.logger.com.amazonaws.request = WARN

...like the docs say here, but it's still doing the verbose logging. My tomcat startup information shows that the logging.properties file is being used:

org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.config.file=/usr/share/tomcat8/conf/logging.properties  

Is there anything else I need to do to?