1.	Install the RulesEngine JAR file After reading the Introduction to RulesEngine document, Download the re.jar file. Include it to the CLASSPATH directory.
2.	Create a Routing.java file The Routing.java needs to be created in the appropriate package directory. This example has the rules embeded in the program. Its always good to have the rules read from a file so that changes can be done without recompiling the java. package com.mm.re.example; import java.util.Hashtable; import com.mm.re.RulesEngine; public class SimpleRouting { static String rules[]=new String[3]; public static void main(String[] args) throws Exception{ //Loading the rules into memory it should be read from a file so that // the rules can be changed on the fly without recompilation. rules[0]="source=='CRM' AND type=='WEB PHONE' AND code=='PRWEB1006' THEN department='web processing'"; rules[1]="source=='IVR' AND type=='CELL PHONE' AND code=='PRIV109' THEN department='phone processing'"; rules[2]="source=='TXTMSG' && type=='TUNE' && code=='ANY' THEN department='media processing'"; //setting up input parameters to evaluate a rule Hashtable IN=new Hashtable(); IN.put("source", "CRM"); IN.put("type", "WEB PHONE"); IN.put("code", "PRWEB1006"); //creating rules engine and executing rule RulesEngine re=new RulesEngine(IN); re.execute(rules); //checking for error after executing rule if(re.getError()==null){ System.out.println("*****OUTPUT*****"); System.out.println("Rules executed without error. Department returned:"+IN.get("department")); System.out.println("*****OUTPUT*****\n"); System.out.println("*****TRACE*****"); System.out.println("matched rule:"+re.getMatch()); System.out.println("*****TRACE*****"); }else{ System.out.println("Error while executing rules:"+re.getError()); } } } Execute the java code using: java com.mm.re.sample.SimpleRouting. The output is given below. *****OUTPUT***** Rules executed without error. Department returned:web processing *****OUTPUT***** *****TRACE***** matched rule:source=='CRM' AND type=='WEB PHONE' AND code=='PRWEB1006' THEN department='web processing' *****TRACE*****