Drools condition part always use MVEL strict mode (extended classes doen't get properties of super class )

Run Following DRL file, which gives compilation error [Error: unable to resolve method using strict-mode: defaultpkg.Test.Price()] [Near : {... Price < 100 ....} ] //Start test.drl rules import java.util.HashMap; declare HashMap end declare Test extends HashMap end rule "Insert" salience 0 when then Test t = new Test(); t.Price = 10; t.put("A", "a"); t.OtherPrices = new HashMap(); t.OtherPrices.OldPrice = 8; //This as well doesn't print content as per toString() of HashMap is there a way to do that? System.out.println("Inserting t="+t); insert(t); end rule "Test HashMap" salience -1 when t: HashMap( Price < 11 ) then t.Price = 11; System.out.println("In Test HashMap"); end rule "Test Inherited" salience -1 when t: Test( Price<100 ) then t.Price = 12; System.out.println("In Test Inherited!"); end rule "Print Result" salience -5 when t: Test() then System.out.println("Finally Price is ="+t.Price); //This as well doesn't print content as per toString() of HashMap is there a way to do that? System.out.println("Finally t="+t); end