By default you shouldn't see those entries as they are with level INFO and by default Tigase is using level CONFIG. At any rate, you can adjust logging level for this particular class and change it to CONFIG:

logging () {
    loggers = {
        'tigase.io.SSLContextContainer' = {
            level = CONFIG
        }
    }
}

Hi, I have tried your conf, when I start the server in the log I see

logging {
    handlers {
        'java.util.logging.FileHandler' {
            count = '20'
            limit = '100000000'
            pattern = '/var/log/tigase/tigase.log'
        }
    }
    loggers {
        'tigase.io.SSLContextContainer' {
            level = 'CONFIG'
        }
    }
}

anyway is still logged the line

 [INFO    ] [             in_13-c2s ] SSLContextContainer.getHardenedMode(): Using hardened-mode: secure for domain: XYZ

from the doc:

loggers - Defines the level of logging for packages running in tigase server. This is similar to the --debug setting, however you must use tigase.{package} format. Default is NONE.

this means that I have to change the config level of all the package tigase.io and I cannot change the single level of the class tigase.io.SSLContextContainer ?

Have you configured any other packages via debug property (for example io)? If you want to increase tigase.io levels but keep tigase.io.SSLContextContainer at lower level then you should configure both of them via logging/loggers bean.

no, the debug is not present in the config, so it should be to the default value

mea culpa, you should use level WARNING in the snippet above.

ok thank you, now it works!