Apache Commons JEXL 3.0 发布

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　　Apache Commons JEXL 3.0 发布，此版本现已提供下载：
　　https://commons.apache.org/jexl/download_jexl.cgi
　　
　　JEXL 3.0 是个重大版本，修改了公共 JEXL API；因为二进制和源代码的不兼容，JEXL 转移到了 org.apache.commons.jexl3 包，Maven artifactId 也改为 commons-jexl3。
　　
　　JEXL 3.0 现要求 Java 6。
　　
　　JEXL 3.0 主要改进
　　==================
　　* A redesigned API that properly segregates the "public" part and the
　　"internal" parts of JEXL.
　　* A real difference between Expression and Script (scripts accept
　　statements: for, while, etc).
　　* The ability to create JEXL functions in script, closure/variables
　　hoisting/currying included.
　　* A set of assignment operators (+=, *= , ...).
　　* A set of String matching operators (^= startsWith, $= endsWith) and
　　their negative counterparts (!^, !$)
　　* A range operator (x .. y) to ease writing loops (for(var x : 1 .. 10))
　　* A literal set syntax to ease creating sets: { 1, 2...}
　　
　　新特性
　　====================
　　* JEXL-178: 'Unsolvable property' message to provide details about
　　underlying exception
　　* JEXL-177: Unified expressions to be used in String literals in JEXL
　　scripts
　　* JEXL-176: Synonym operator name 'in' for operator =~ // Remove
　　'foreach...in' syntax
　　* JEXL-174: Overloadable property access operators
　　* JEXL-173: Duck-typed java closures
　　* JEXL-170: Implement assignment operators
　　* JEXL-164: public getters for high/low properties for IntegerRange and
　　LongRange
　　* JEXL-152: Extend Range literal to support Long values
　　* JEXL-149: Set Construction as per EL 3.0 spec
　　* JEXL-133: String matching Operator short-hand inspired by CSS3
　　* JEXL-128: ObjectContext should implement NamespaceResolver
　　* JEXL-127: Allow the creation of functions
　　* JEXL-123: Redesign API for stability
　　* JEXL-122: Move JEXL from org.apache.comms.jexl2 to
　　org.apache.commons.jexl3
　　* JEXL-136: Script calls within scripts may fail with number arguments
　　* JEXL-135: Using map as script parameter or local variable
　　* JEXL-134: Issue with evaluation of concat of variables : \r + \n gives 0
　　* JEXL-131: UnifiedJexl parsing may fail with NPE
　　* JEXL-130: Ternary Conditional fails for Object values
　　* JEXL-126: Decimal numbers literals should be 'double' by default
　　(instead of 'float')
　　
　　Bugs 修复
　　==================

　　* JEXL-184: dot-ed>　　* JEXL-180: Documentation - suggests using float for financials
　　* JEXL-171: Map access operator does not work if key name clashes with
　　map property name

　　* JEXL-169: A string is wrongly>　　* JEXL-168: Dedicated operator for String concatenation
　　* JEXL-79:  Add support for growable arrays (ArrayLists)
　　* JEXL-167: Possible loss of value when converting BigDecimal to BigInteger
　　* JEXL-166: Incorrect operator symbol for bitwise complement in
　　jexlArithmetic
　　* JEXL-163: empty(new ("java.lang.Long", 4294967296)) returns true
　　* JEXL-162: empty() function throws an exception : unsupported type
　　* JEXL-160: typo in package.html
　　* JEXL-158: Handle locale decimal separators correctly
　　* JEXL-157: Replace File.pathSeparator with File.separator
　　* JEXL-146: Performance problem in Interpreter.unknownVariable mechanism

　　* JEXL-145: Sandbox calling wrong check (classname vs>　　* JEXL-144: Empty array property setting fails
　　* JEXL-142: Map expression issue with empty key
　　* JEXL-141: Suffix for Big Decimal and Big Integer Literal is
　　incorrectly mentioned in Java docs
　　* JEXL-137: Invalid script variable list for nested array/map access
　　
　　改进列表：
　　http://commons.apache.org/jexl/changes-report.html
　　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。