Now with Drools demo (Rete System to match which level building rules to fire for which PlayerProfiles/Archetypes).

src/org/drools/examples/simple/DroolsExample.java

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+package org.drools.examples.simple;
+
+import java.io.File;  
+import org.drools.KnowledgeBase;  
+import org.drools.KnowledgeBaseFactory;  
+import org.drools.builder.KnowledgeBuilder;  
+import org.drools.builder.KnowledgeBuilderFactory;  
+import org.drools.builder.ResourceType;  
+import org.drools.io.ResourceFactory;  
+import org.drools.runtime.StatefulKnowledgeSession;  
+import org.drools.runtime.StatelessKnowledgeSession;  
+  
+public class DroolsExample {  
+    /** 
+     * @param args 
+     */  
+    public static void main(String[] args) {
+               //Create KnowledgeBase...  
+                KnowledgeBase knowledgeBase = createKnowledgeBase();  
+                //Create a statefull session  
+        StatefulKnowledgeSession session = knowledgeBase.newStatefulKnowledgeSession();  
+  
+                 //Create Facts - two ban accounts  
+                 Account account = new Account();  
+         account.setBalance(10);  
+         account.setId("N1");  
+  
+         Account account2 = new Account();  
+         account2.setBalance(120);  
+         account2.setId("N2");  
+  
+                 //Insert the bank account facts into a State full session  
+         session.insert(account);  
+         session.insert(account2);  
+  
+                 //Note that at this point, afetr fact insertation the Agenda has one activation ready to be fired.  
+                 //Account1 is less than 100.  
+  
+                 //Only now we will fire the rules which are already in the agenda  
+         session.fireAllRules();   
+  
+                 //A message of N1 is less than 100 will be printed to stdout.  
+    }  
+  
+        /** 
+        * Create new knowledge base 
+        */  
+    private static KnowledgeBase createKnowledgeBase() {  
+        KnowledgeBuilder builder = KnowledgeBuilderFactory.newKnowledgeBuilder();  
+                //Add drl file into builder  
+        File accountRules = new File("rules/BasicAccountRule.drl"); //Where the account rule is.  
+        builder.add(ResourceFactory.newFileResource(accountRules), ResourceType.DRL);  
+        if (builder.hasErrors()) {  
+            throw new RuntimeException(builder.getErrors().toString());  
+        }  
+  
+        KnowledgeBase knowledgeBase = KnowledgeBaseFactory.newKnowledgeBase();  
+  
+                //Add to Knowledge Base packages from the builder which are actually the rules from the drl file.  
+        knowledgeBase.addKnowledgePackages(builder.getKnowledgePackages());  
+  
+        return knowledgeBase;  
+    }  
+  
+}