[rules-users] no-loop usage question

I have been reading through the documentation and trying some of the tutorials and have a question about the no-loop attribute. Not really relevant to the post, but I figured I would mention it, I have been following this post and updating it to use the current version of Drools. http://www.onjava.com/pub/a/onjava/2005/08/03/drools.html?page=7 I have written my rules as such: package org.drools.examples import org.drools.examples.StockOffer; rule PriceBelow100 dialect "java" when s: StockOffer( stockPrice < 100 && recommendPurchase == null ) then modify( s ) { setRecommendPurchase(StockOffer.YES) } end rule NegativeStockPrice dialect "java" no-loop true when s: StockOffer( stockPrice < 0 ) then modify( s ) { setRecommendPurchase(StockOffer.NO) } end rule DontBuyXYZStock dialect "java" no-loop true when s: StockOffer(stockName == "XYZ" && stockPrice < 10 ) then modify( s ) { setRecommendPurchase(StockOffer.YES) } end rule BuyXYZStock dialect "java" no-loop true when s: StockOffer(stockName == "XYZ" && stockPrice > 10 ) then modify( s ) { setRecommendPurchase(StockOffer.NO) } end My question is, why do I have to put no-loop on every rule (except for the first). After the first time through the rules, it shouldn't be modifying to where the rules would fire it again. Am I doing something wrong with how my rules are written? My sample data is this: package org.drools.examples; import org.drools.examples.BusinessLayer; import org.drools.examples.StockOffer; import junit.framework.TestCase; /* * JUnit test for the business rules in the * application. * * This also acts a 'simulator' for the business * rules - allowing us to specify the inputs, * examine the outputs and see if they match our * expectations before letting the code loose in * the real world. */ public class BusinessRuleTest extends TestCase { /** * Tests the purchase of a stock */ public void testStockBuy() throws Exception { // Create a Stock with simulated values StockOffer testOffer = new StockOffer(); testOffer.setStockName("MEGACORP"); testOffer.setStockPrice(22); testOffer.setStockQuantity(1000); // Run the rules on it BusinessLayer.evaluateStockPurchase(testOffer); // Is it what we expected? assertTrue(testOffer.getRecommendPurchase() != null); assertTrue("YES".equals(testOffer.getRecommendPurchase())); } /** * Tests the purchase of a stock makes sure the system will not accept * negative numbers. */ public void testNegativeStockBuy() throws Exception { // Create a Stock with our simulated values StockOffer testOffer = new StockOffer(); testOffer.setStockName("MEGACORP"); testOffer.setStockPrice(-22); testOffer.setStockQuantity(1000); // Run the rules on it BusinessLayer.evaluateStockPurchase(testOffer); // Is it what we expected? assertTrue("NO".equals(testOffer.getRecommendPurchase())); } /** * Makes sure the system will buy stocks of XYZ corp only if it really cheap */ public void testXYZStockBuy() throws Exception { // Create a Stock with our simulated values StockOffer testOfferLow = new StockOffer(); StockOffer testOfferHigh = new StockOffer(); testOfferLow.setStockName("XYZ"); testOfferLow.setStockPrice(9); testOfferLow.setStockQuantity(1000); testOfferHigh.setStockName("XYZ"); testOfferHigh.setStockPrice(11); testOfferHigh.setStockQuantity(1000); // Run the rules on it and test BusinessLayer.evaluateStockPurchase(testOfferLow); assertTrue("YES".equals(testOfferLow.getRecommendPurchase())); BusinessLayer.evaluateStockPurchase(testOfferHigh); assertTrue("NO".equals(testOfferHigh.getRecommendPurchase())); } } I can post up all the code if this isn't enough to answer the question. Thanks!