Take a look at

• https://en.wikipedia.org/wiki/List_of_Ajax_frameworks
• http://www.w3schools.com/ajax/ajax_intro.asp

Take a look at the Javascript tutorial on w3schools. In particular:

• JS Output
• JS Arrays
• Introduction to JS Objects
• The chapter starting at Javascript Objects definition
• The chapter starting at Javascript Function Definition

Zip containing two Netbeans projects, one with an RMIserver, one with an RMIclient