[rules-users] how to write the rule

Hi, public class Order { Buyer buyer; List<Item>orderItems = new ArrayList<Item>(); public List<Item> getOrderItems() { return orderItems; } public void setOrderItems(List<Item> items) { this.orderItems = items; } } public class Item { String id; double price; int amount; String catelogTag; public double getPrice() { return price; } public void setPrice(double price) { this.price = price; } } business rule import base.Order; import base.Item; rule "rule1" when $o: Order($b : buyer); eval ($b != null && $b.getUserLevel() == UserTag.TAG[UserTag.TA]); then System.out.println(""); end rule "rule2" when $o:Order($b : buyer); #here is the error message in eclipse: "Item could not be resolved" $i:Item() from $o.orderItems; then System.out.println(""); end when I try to build the rule and run case, I got the following error in Rule Compilation error : [Rule name='rule2'] Rule_rule2_0.java (8:785) : item cannot be resolved 1. What is my error in the code and how to get that every Item in the orderItems list？ 2. Another question is how to get source code when build the rule via eclise plugin? thinks in advance