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Notice that the only element that was changed was the threshold parameter. This change allows the logging output to the console to be at the debug level.
ServiceMix inside OpenESB / Glassfish
If ServiceMix is deployed inside Glassfish (through OpenESB) then logging will not work because Glassfish only supports the JDK Logging out of the box. You can find help on the Glassfish FAQ. This of course will write the logging to a separate file but at least the logging statements are not silently swallowed anymore.