then you have to work out how to provide the absolute path that you want
You can configure your Websphere server to specify Java system properties; I haven't done that in WAS6 but it's buried several obscure layers deep in WAS5. But the option is there somewhere.
# You can use a different file by specifying a filename
# with the java.util.logging.config.file system property.
# For example java -Djava.util.logging.config.file=myfile
The JVM option is invalid: -Xquickstart,
Could not create the Java virtual machine.