Java Expression Language (JEXL) 是一个表达式语言引擎，可以用来在应用或者框架中使用。JEXL 受Velocity 和 JSP 标签库 1.1 (JSTL) 的影响而产生的。需要注意的是， JEXL 并不时 JSTL 中的表达式语言的实现。
Commons JEXL 2.1 发布了，该版本和 2.0.1 是二进制兼容的，但源码不兼容，因为新增了两个接口：
◆ org.apache.commons.jexl2.Script
◆ org.apache.commons.jexl2.JexlInfo
JEXL 2.1 改进内容：
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1. A more thorough arithmetic (JexlArithmetic) that allows fine control over decimals (scale and precision), a new syntax for numeric literals (OGNL inspired Big and Huge notations) and a better type handling keeping the most appropriate representation in casual operations.
2. The introduction of script variables and parameters that reduce context dependencies and methods; this allows to perform checks after script creation (light static checking hints). Plus the ability to call script from scripts.
3. A sandoxing feature to restrict and rename what JEXL can access from the environment allowing tighter control over security.
4. Extensions to UnifiedJEXL that allow the creation of templates.
完整记录请看：
http://commons.apache.org/jexl/changes-report.html#a2.1
原文链接：http://www.open-open.com/news/view/121c31f
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