It would be simpler to configure server-side logging if SLF4J were used instead of ServletContext and java.util.logging. As a minor step in that direction, if it is agreeable, I could make a pull request for replacing usages in RPCServletUtils and adding slf4j-api to the dependencies in the appropriate pom files. I would use the api jar and version currently in GWT Tools for building and dependencies.

LogFilterServletContext could potentially have SLF4J as well, but perhaps those using it already have their logging set up as desired.

I have not used RequestFactory or com.google.gwt.logging, and it looked like those might be tied up with java.util.logging emulation.