The xel-config Element"
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If not specified and you are running your ZK application under Java 1.4, ZK uses the XEL implementation from ZK Commons EL (<tt>zcommons-el.jar</tt>), which is a performance-enhanced version of Apache Commons EL. | If not specified and you are running your ZK application under Java 1.4, ZK uses the XEL implementation from ZK Commons EL (<tt>zcommons-el.jar</tt>), which is a performance-enhanced version of Apache Commons EL. | ||
| − | Since ZK | + | Since ZK 6, if not specified, ZK uses the new XEL implementation from the ZK EL Library (i.e., <tt>zel.jar</tt>), which supports new features seen in <i>Unified Expression Language 2.2</i> such as method calls and l-value. If ZK cannot find the <tt>zel.jar</tt> in your class-path, ZK will degrade to use the original ZK Commons EL(<tt>zcommons-el.jar</tt>). |
If your Web server uses another implementation, you can do one of the following: | If your Web server uses another implementation, you can do one of the following: | ||
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! Version !! Date !! Content | ! Version !! Date !! Content | ||
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| − | | | + | | 6.0.0 |
| Sep. 2011 | | Sep. 2011 | ||
| Support those new features seen in Unified Expression Language 2.2 such as method calls and l-value. | | Support those new features seen in Unified Expression Language 2.2 such as method calls and l-value. | ||
| − | |||
| − | |||
| − | |||
| − | |||
|} | |} | ||
{{ZKConfigurationReferencePageFooter}} | {{ZKConfigurationReferencePageFooter}} | ||
Revision as of 05:55, 3 October 2011
The allowed child elements include evaluator-class. At most one xel-config element is allowed for each zk.xml.
<xel-config>
<evaluator-class>my.MyExpressionFactory</evaluator-class>
</xel-config>
The evaluator-class Element
[Default: ELFactory if run under Java 1.4] [Default: ELFactory if run under Java 1.5 or above]
It specifies the class used to evaluate XEL (Extensible Expression Language) expressions. The specified class must implement the ExpressionFactory interface.
If not specified and you are running your ZK application under Java 1.4, ZK uses the XEL implementation from ZK Commons EL (zcommons-el.jar), which is a performance-enhanced version of Apache Commons EL.
Since ZK 6, if not specified, ZK uses the new XEL implementation from the ZK EL Library (i.e., zel.jar), which supports new features seen in Unified Expression Language 2.2 such as method calls and l-value. If ZK cannot find the zel.jar in your class-path, ZK will degrade to use the original ZK Commons EL(zcommons-el.jar).
If your Web server uses another implementation, you can do one of the following:
- If you prefer the implementation based on Apache JSP 2.1 EL, you have to specify the ApacheELFactory class. If the Web server doesn't support Apache JSP 2.1 EL, you have to copy el-api.jar (JSP 2.1 API[1]) and jasper-el.jar (Apache's implementation) to your Web application.
- If you prefer the implementation based on Apache Commons EL (JSP 2.0 EL), you have to specify the ApacheELFactory class. If the Web server doesn't support Apache Commons EL, you have to copy commons-el.jar to your Web application.
- If you want a different implementation, you can extend from ELFactory or ApacheELFactory by simply overriding the newExpressionEvaluator method. Of course, if you prefer, you can implement the ExpressionFactory interface directly.
Notes
- ↑ Required only if you are using the Web server that supports only JSP 2.0.
Version History
| Version | Date | Content |
|---|---|---|
| 6.0.0 | Sep. 2011 | Support those new features seen in Unified Expression Language 2.2 such as method calls and l-value. |