Expression Language - The Java EE 6 Tutorial (original) (raw)

Chapter 6

Expression Language

This chapter introduces the Expression Language (also referred to as the EL), which provides an important mechanism for enabling the presentation layer (web pages) to communicate with the application logic (managed beans). The EL is used by both JavaServer Faces technology and JavaServer Pages (JSP) technology. The EL represents a union of the expression languages offered by JavaServer Faces technology and JSP technology.

The following topics are addressed here:

Overview of the EL
Immediate and Deferred Evaluation Syntax
Value and Method Expressions
Defining a Tag Attribute Type
Literal Expressions
Operators
Reserved Words
Examples of EL Expressions