Re: [rules-users] NullPointerException when updating a fact

I have appended the code that leads to the exception. I have also noticed that the exception doesn't arise when using the concrete FirstName type in the retracting rule. I have been using the generic base class Value because I didn't want to write the same rule for all types extending from it. Main.java <http://drools.46999.n3.nabble.com/file/n4025204/Main.java> validation.drl <http://drools.46999.n3.nabble.com/file/n4025204/validation.drl> -- View this message in context: http://drools.46999.n3.nabble.com/NullPointerException-when-updating-a-fa... Sent from the Drools: User forum mailing list archive at Nabble.com.