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#Contribution Guide use logger instead of system.out.println
Whatever is the logging framework (logback, log4j, commons-logging, java.util.logging, ...), a logger should be:
private: Never be accessible outside of its parent class. If another class needs to log something, it should instantiate its own logger. static: Not dependent on an instance of a class (an object). When logging something, contextual information can of course be provided in the messages but the logger should be created at class level to prevent creating a logger along with each object. final: Be created once and only once per class.
use CamelCase : UpperCamelCase for Classes and lowerCamelCase for methodes and variables