JavaServer Pages, 3rd Edition

Name

Expression

Synopsis

The Expression class represents an EL expression, which may or may not be syntactically valid.

Synopsis

Class name:	javax.servlet.jsp.el.Expression
Extends:	None
Implements:	None
Implemented by:	Internal container-dependent class; most containers use the reference implementation of the class (developed in the Apache Jakarta project)

Constructors

public Expression( )

Creates a new Expression instance.

Methods

public abstract Object evaluate(VariableResolver variableResolver) throws ELException

Evaluates the expression using the variables provided by the VariableResolver. Some implementations may need to parse the expression when this method is called, so the caller should be prepared to handle parse exceptions as well as runtime exceptions.