The missing code from Jon Skeet's answer to a question on Stack Overflow which shows that once integrated into the DateTimeFormatterBuilder, a custom DateTimePrinter does not give the right result. http://stackoverflow.com/a/17236321/138513

Test.java

import org.joda.time.LocalDate;
import org.joda.time.ReadablePartial;
import org.joda.time.format.DateTimeFormatterBuilder;

import java.util.Locale;

public class Test {
    public static void main(String[] args) {
        StringBuffer buffer = new StringBuffer();
        ReadablePartial partial = LocalDate.now();

        new DateTimeFormatterBuilder()
                .appendDayOfMonth(1)
                .appendLiteral(' ')
                .append(new PolishGenitiveMonthPrinter())
                .toPrinter()
                .printTo(buffer, partial, Locale.ROOT);

        System.out.println(buffer.toString());
    }
}