Below is my drl and the Pojo that I am using, please guide me on this : #created on: Aug 5, 2011 package com.sample import com.sample.Customer rule "Below 100" when $c:Customer() $c.getSi() < 100

then $c.setVal("<100"); end rule "Below 200" when $c:Customer() $c.getSi() < 200

then $c.setVal("<200"); end rule "Below 300" when $c:Customer() $c.getSi() < 300

then $c.setVal("<300"); end *Pojo :* package com.sample; public class Customer { private double si; private String val; public double getSi() { return si; } public double setSi(double p,double r, double t) { si = (p*r*t)/100; return si; } public String getVal() { return val; } public void setVal(String val) { this.val = val; } } The error that I get while executing is : [9,13]: unknown:9:13 mismatched token: [@33,126:126='<',<79>,9:13]; expecting type THEN[20,13]: unknown:20:13 mismatched token: [@67,224:224='<',<79>,20:13]; expecting type THEN[32,13]: unknown:32:13 mismatched token: [@101,323:323='<',<79>,32:13]; expecting type THEN java.lang.RuntimeException: Unable to compile "methodCall.drl". at com.sample.Calling.createRuleBase(Calling.java:48) at com.sample.Calling.main(Calling.java:24) and my calling class is : package com.sample; import java.io.IOException; import java.io.InputStreamReader; import java.io.Reader; import org.drools.RuleBase; import org.drools.RuleBaseFactory; import org.drools.StatefulSession; import org.drools.compiler.PackageBuilder; import org.drools.rule.Package; public class Calling { public static void main(String[] args)throws IOException { Customer c1 = new Customer(); c1.setSi(1000, 5, 2); try { RuleBase ruleBase = createRuleBase(); StatefulSession session = ruleBase.newStatefulSession (); session.insert(c1); session.fireAllRules(); session.dispose(); System.out.println("Interest is : "+c1.getVal()); } catch (Throwable t) { t.printStackTrace(); } } private static RuleBase createRuleBase() throws Exception { Reader source = new InputStreamReader(Calling.class.getResourceAsStream( "methodCall.drl" ) ); PackageBuilder builder = new PackageBuilder(); builder.addPackageFromDrl( source ); if ( builder.hasErrors() ) { System.out.println( builder.getErrors().toString() ); throw new RuntimeException( "Unable to compile \"methodCall.drl\"."); } Package pkg = builder.getPackage(); RuleBase ruleBase = RuleBaseFactory.newRuleBase(); ruleBase.addPackage( pkg ); return ruleBase; } }