MVEL

Question

我是 MVEL 的新手。按照我遵循的步骤

1) 从 http://mvel.codehaus.org/Downloading+MVEL 下载最新即下载 mvel2-2.2.0.jar（需要 JDK 1.5+）

2) 创建了一个简单的自定义对象列表

       class TestMVEL {
    public static void main(String[] p){
        String expr0 = "fruits[1]";
        String expr1 = "System.out.println(fruits[1]);";
        String expr2 = "foreach( f : fruits) { System.out.println(f.getName()); }";  

        System.out.println(MVEL.eval(expr0, new Basket()));//prints Fruit{name=Banana}
        MVEL.eval(expr1, new Basket());// prints Fruit{name=Banana}
        MVEL.eval(expr2, new Basket());//error
    }
}
class Basket {
   List<Fruit> fruits = new ArrayList<Fruit>();

   public List<Fruit> getFruits(){
     fruits.clear();
     fruits.add(new Fruit("Apple"));
     fruits.add(new Fruit("Banana"));
     fruits.add(new Fruit("Orange"));
     return fruits;
   }
}

class Fruit { 
    private String name; 
    public Fruit(String n){
        name = n;
    }
    public String getName(){
        return name;
    }
    public String toString() {
        return "Fruit{" + "name=" + name + '}';
    }
}

3) 低于错误

Exception in thread "main" [Error: f.getName(): Class org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer can not access a member of class test.Fruit with modifiers "public"] [Near : {... foreach( f : fruits) { System.out.println(f.getName()); } ....}]

Answer 1

class水果需要public.

public class Fruit...

MVEL - Error: could not access field in ReflectiveAccessorOptimizer

MVEL - Error: could not access field in ReflectiveAccessorOptimizer

expression