private static void validate(String _package_, boolean shouldAvoidJava){
		if(_package_==null || !Consts.JAVA_PACKAGE_PTN.matcher(_package_).matches())
			throw new IllegalArgumentException(
				"_package_ is null, empty (default package) or not a valid format: "+_package_);
		if(shouldAvoidJava){
			if(_package_.startsWith("java") || _package_.startsWith("javax"))
				throw new IllegalArgumentException(
					"_package_ shouldn't starts with java or javax: "+ _package_);	
		}
	}