Logging isLoggable not working in WebSphere

Question

I'm using java.util.logging.Logger for logging within websphere and have been trying to get Logger.isLoggable to work, but it isn't working as expected. For example, if I set the logging level for a certain package to ALL, and check for whether Level.Finest is loggable it returns false and nothing is logged to the logging file.

In the table below I have defined on the first line the package level logging level within websphere. In the following lines I define possible isLoggable options and whether or not true would be returned when the package logging is set to the value specified above. Are my expectations incorrect or is the logging levels not set in the expected manner within websphere?

Package level Log Setting    ALL      FINEST   FINER     FINE    WARN      SEVERE

isLoggable(all)              Yes      No       No        No       No        No

isLoggable(finest)           Yes      Yes      No        No       No        No

isLoggable(finer)            Yes      Yes      Yes       No       No        No

isLoggable(fine)             Yes      Yes      Yes       Yes      No        No

isLoggable(warn)             Yes      Yes      Yes       Yes      Yes       No

isLoggable(severe)           Yes      Yes      Yes       Yes      Yes       Yes

Thank you very much.

Jeremy