This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Your Payment class should have a proper overriden toString() (and hashCode() too if you use this class in collection classes which use hash code)method which returns a String representing the object in a meaningful text. This is not related to Struts or Tomcat, so might better sit in the JIG forum.