java表达式语言，无法访问'不安全'的java方法

I am working on a project where I will let users submit small 'scripts' to the server, and I will execute those scripts. There are many scripting languages which can be embedded into a Java program, such as mvel, ognl, uel, clojure, rhino javascript, etc., but, as far as I can tell, they all allow script writer to call Java constructors, static methods, etc.I am working on a project where I will let user