In the documentation [1] example 4.20 mention the following code snippet.

KieRuntimeLogger logger = KieServices.Factory.get().newFileLogger(ksession, "logdir/mylogfile");

However that doesn't compile. I believe is missing a .getLoggers() so the proper snippet, I believe, was intended as

KieRuntimeLogger logger = KieServices.Factory.get().getLoggers().newFileLogger(ksession, "logdir/mylogfile");

Ciao
MM

References:
[1] http://docs.jboss.org/drools/release/6.0.0.Final/drools-docs/html_single/#d0e1904