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the problem is connection because in consolle don't have Connessione OK that comes System.out.println("Connessione OK");.
What can I do to solve this problem? what are the changes that can be made?...

I have understood that the problem is an object that is null, but this problem don't presented it only in TipoCompetizioneSQL but also in other class and all at same line:
Statement enunciato =...

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at agroludos.database.TipoCompetizioneSQL.getDati(TipoCompetizioneSQL.java:58)
at...

during the execution of the my application java (developed following design pattern as front controller, dao factory, business object, singleton) i have a problem of connection at this line :...