Problem with log4j only in installed application

> I think you are mixing up the words 'anything' and 'nothing' as well as 'any' and 'no'. 


Yes, you're right. Sorry for my English.

The problem, as said chhh, was that log4j was not properly configured due to the config file log4j.xml was not found.
I've solved passing in the jvm config the param "-J-Dlog4j.configuration=com/aws/log4j/log4j.xml"

Thanks for the responses.