Questão Q839795

In Java EE 6, Expression Language supports both immediate and deferred evaluation of expressions. Immediate evaluation means that the expression is evaluated and the result returned as soon as the page is first rendered. Deferred evaluation means that the technology using the expression language can use its own machinery to evaluate the expression sometime later during the page’s lifecycle, whenever it is appropriate to do so.

Expressions that are evaluated immediately and the expressions whose evaluation is deferred use, respectively, the syntaxes

Alternativas

${ } and # { }

<exp:snapshot> and <exp:defer>

$EXP{ } and # EXP{ }

$_jsf{ } and #_jsf { }

$( ) and # ( )

Comentários

Immediate Evaluation

All expressions using the ${} syntax are evaluated immediately.

Deferred Evaluation

Deferred evaluation expressions take the form #{expr} and can be evaluated at other phases of a page lifecycle as defined by whatever technology is using the expression.

http://docs.oracle.com/javaee/6/tutorial/doc/bnahr.html

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