[rules-users] NullPointerException with Wrapper objects

I am facing problems which many have encountered in the past. I searched forums but could not get precise answer. The problem is with null values in Wrapper objects. See the following code: rule "Null Check " salience 100 when Salary ( ld : loanDeduction==null || < 0f ) // loanDeduction is java.lang.Float then log("Load return is null"); //Global function ld = 0f; end rule "Nett Salary" salience 70 when Salary ( nett != ( gross – loanDeduction – pf) ) then log("Invalid nett salary amount"); end You may have idea what I am trying to do. But I get NullPointerException in “Nett Salary” rule when I fire the rules having fact with null in the loanDeduction attribute. I believe my “Null Check” exception should execute first and it does when I put negative value in loadDeduction. What is solution in such a case? -- View this message in context: http://www.nabble.com/NullPointerException-with-Wrapper-objects-tp2351550... Sent from the drools - user mailing list archive at Nabble.com.