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The most fundamental difference between JavaServer Faces versions 11 and 12 is the introduction of the Unified EL Specification With JSF 11, a JSF-specific implementation of EL was created and although very similar to other EL implementations, such as those used by JSP 20 and the JSP Standard Tag Library (JSTL), it still had significant differences Because expression languages had become an increasingly popular and well-utilized technology across the Java Web tier, it was decided to generalize the EL concepts introduced specifically by JSF so that they could be used by a wider set of Java Web-tier technologies This resulted in the creation of the Unified EL
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E XPERT GROUP I NSIGHT The Unified EL is now provided by the JSP 21 specification, though it
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is specified in a separate sub-document in that specification This was done to facilitate eventually separating the Unified EL out into its own JCP specification for use by the entire Java platform Also, separating the EL from the specific technology hosting it, such as the Java Web tier, means that several important concepts that were formerly in the domain of the EL, such as the notion of scope, are now outside of the EL proper and reside only in JSP or JSF Even so, the rest of this discusson will treat these concepts as if they are a part of the core EL JSF 11 developers needn t worry about having to change the syntax of their expressions to upgrade to 12, because the Unified EL accepts syntax compatible with JSF 11 For example, the following still holds true: JSF 12 expressions still use delimiters #{ and } Expressions starting with #{ are still evaluated at runtime, which is referred to as deferred evaluation Expressions starting with ${ are still evaluated at page compile time and are referred to as immediate evaluation
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JSF 12 TIP The JSF 11 expression language is upwardly compatible with JSF 12 Examining the Evolution of the EL: Deferred vs Immediate Expressions
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The EL used in JSF 10 and 11 is an extension of the EL first used in the JSP Standard Tag Library (JSTL), and later in JSP versions 12 and 20 The main extension brought to the EL by JSF that is not present in previous versions is the concept of deferred expressions In JSP, any ${} expression that appears in the page is evaluated immediately as the page is rendered If an expression appears as the value of a JSP tag attribute, such as:
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<c:set var="name" value="Falstaff" scope="page" /> <demo:customTag value= ${pageScopename} />
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then the JavaBeans property named value in the CustomTagjava tag handler class must have a type that matches the type to which the expression evaluates Furthermore, the expression ${pageScopename} is evaluated immediately when the demo:customTag tag is encountered and the setValue( ) method of the CustomTagjava tag handler receives the evaluated value Immediate evaluation is perfectly adequate for JSP, but JSF needed something more JSF introduced the request processing lifecycle (described in 3), which governs what happens when the form is submitted (postback) During a postback, the JSP page that rendered the markup that is being posted back is not known and not available to the JSF runtime, therefore any expressions in that page are not available since they were evaluated immediately when the page was rendered JSF introduced the deferred expression concept to allow expressions to be useful both during the rendering of the page, and during a postback This concept allows a deferred expression, such as #{username}, to show a value to the user, and also to be the target of a value entered by the user As described earlier, JSF reserves the #{} delimiter to mean deferred expression and allows JSP to claim ${} to mean immediate expression The #{} delimiter was chosen because it prevents the JSP runtime from evaluating the expression, allowing the JSF JSP Custom Tag handler to create the expression instance and store it in the component for later evaluation Figure 4-2 illustrates the evolution of the EL over time The Unified EL used in JSF 12, JSP 21, and JSTL 12 adds the concept of deferred expression and allows JSP to be aware of deferred and immediate expressions
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