Resource(links) nedded for new topics in OCEJWCD(1Z0-899)

[Ashok Pradhan]

Topic 1
More options for the Model
[ ] Understand the roles of JDBC and JPA
[ ] Understand the many elements that make up the model
[ ] Understand fundamentals of connecting to a database using JDBC or JPA

Topic 2
Asynchronous web applications
[ ] Understand the interactions that are essential to asynchronous web pages
[ ] Understand the role of AJAX-style client side programming
[ ] Implement asynchronous servlets using the facilities of Java EE 6

Where can I get resource for these topics.Please give me some links regarding these topics.