CHAPTER 9 Extending PeopleCode with Java

This chapter begins a six-chapter journey into the Java language. In this chapter, you will create an extensible meta-HTML processor, a template processor using the Apache Velocity Engine, and a server-side JSON parser that uses the JSON.simple Java-based JSON parser.

Through these examples you will learn when and how to use Java, how to deploy and use third-party Java classes, and strategies for dealing with Java upcasting from PeopleCode. Upcasting and downcasting are OOP terms used to describe the process of referencing an object as a type higher or lower in the inheritance hierarchy. The term upcasting is used when storing an object in a variable declared as a super type of the given object. To ...

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