The main purpose of Java Platform, Enterprise
Edition (Java EE) 5 is to ease development. Now the Jsp2.1 includes the Java
Standard TagLibrary(JSTL) and JavaServerFaces technology.
This version has new expression language
syntax that allows deferred evaluation of expressions. It now enables using
the expression to both get and set data and to invoke methods, and
facilitates customizing the resolution of a variable or property referenced
by an expression.
It supports resource injection through annotations
to simplify configuring access to resources and environment data.
It has complete alignment of JSF technology tags and
JSP software code. Earlier the version 1.0 of jsf technology depended
on jsp 1.2 technology. The reason is that the Jsp 1.2 was already available
at the time, and the intension was to make the Jsf 1.0 interface more
accessible to a broader audience. As jsp1.2 does not have an integrated
expression language and because the Jsp 2.0 EL does not meet all of the
needs of Jsf, therefore jsp2.1 was developed to enhance the expression
language to meet the needs of Jsf technology.
Qualified functions now take precedence over the
ternary operator when the "." operator in use or we can say that
ability to redefine the behavior of the "."operator through a
EL now supports "literal expressions". The
expression which were previously considered to be non-EL value text must now
be considered an EL expression.
EL now supports Java 5.0 enumerations.
Ability to plug in
Property Resolvers on a per-application and per-page basis.
Ability to express references to bean methods using
the expression language and invoking those methods via a Method BindingAPI.