Maybe the comment at the end of the this page
http://publib.boulder.ibm.com/infocenter/wmbhelp/v6r0m0/index.jsp?topic=/com.ibm.etools.mft.doc/as24996_.htm
will help?
Depending on the java version you may have to add the "lumberjack" (source forge) support pack (java 1.3 x).
If you need to use it you may have to add -Djava.util.logging.configfile=/path ...
I'm writing a pretty complex used defined node in Java and want to use Java Logging with a custom handler and formatter. With Broker 5 everything worked fine but now I'm migrating to Broker 6 a ...