Hi Oggu When you have a property pp in your Scala, the Scala compiler generates a method pp(), not getPp() as Drools and many Java tools expect (the JavaBeans specification). Try this to see what happens; echo 'case class C1 ( pp1: Int, var pp2:String )' > case_class.scala scalac case_class.scala javap C1.class | grep pp public int pp1(); public java.lang.String pp2(); public void pp2_$eq(java.lang.String); Instead in Scala you can do: import scala.reflect.{BeanProperty, BooleanBeanProperty} class C1 { @BeanProperty val pp1: Int = 0; @BeanProperty var pp2:String = "" } 2014-01-25 swaroop <swaroop.oggu(a)gmail.com&gt; -- Jean-Marc Vanel Déductions SARL - Consulting, services, training, Rule-based programming, Semantic Web http://deductions-software.com/ +33 (0)6 89 16 29 52 Twitter: @jmvanel , @jmvanel_fr ; chat: irc://irc.freenode.net#eulergui