June 2014
Intermediate to advanced
578 pages
12h 2m
English
Content preview from Mastering JavaServer Faces 2.2Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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EL 3.0 overview
EL 3.0 (JSR 341, part of Java EE 7) represents a major boost of EL 2.2. The main features of EL 3.0 are as follows:
- New operators
+,=, and; - Lambda expressions
- Collection objects support
- An API for standalone environments
In the upcoming sections, you will see how to use EL 3.0 features in JSF pages.
Working with the assignment operator
In an expression of type, x = y, the assignment operator (=), assign the value of y to x. In order to avoid an error of the kind PropertyNotWritableException, the x value must be an lvalue. The following examples show you how to use this operator in two simple expressions:
#{x = 3}evaluates to 3#{y = x + 5}evaluates to 8
The assignment operator is right-associative (z = y = x is equivalent with z = (y ...
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