Get the number of days in a month

http://www.java-tips.org/java-se-tips/java.util/get-the-number-of-days-in-a-month.html

Open Source Charting & Reporting Tools in Java

http://java-source.net/open-source/charting-and-reporting

Free high quality images

http://www.sxc.hu/

Does Derby support a LIMIT command?(Question 5.2)

http://db.apache.org/derby/faq.html

Using Java DB in Desktop Applications

http://java.sun.com/developer/technicalArticles/J2SE/Desktop/javadb/

FAQs for Java DB

http://developers.sun.com/javadb/features/faqs.jsp#5q1