The logging example comes with the GWT SDK: https://gwt.googlesource.com/gwt/+/master/samples/--
If you use Eclipse and the GWT update site the SDK should be installed in eclipse/plugins/com.google.gwt.eclipse.sdkbundle_2.5.1/gwt-2.5.1
If you want runtime log settings you must keep logging enabled with a reasonable default log level while compiling your app. If needed you can log more details by setting the root logger's log level through a URL parameter, e.g. "&logLevel=FINE"
Honestly I have no idea if you can set the log level per logger or only for the root logger. Something like logging.properties isn't possible as everything gets compiled to JS and I guess you don't want the browser to download such a runtime configuration file every now and then because you could have updated that file.
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