Hello, I have searched the forum for information on this case, but I haven't find, at least yet. I am trying to insert an object containing a HashMap, but when I call ksession.insert( fact ) method I get this error: java.lang.ClassCastException: java.util.HashMap cannot be cast to java.lang.Comparable I have searched the net for this kind of error, but it's not clear why I'm getting it, especially that I am inserting with success a global HashMap. Can you help me please, it is rather urgent. Thank you in advance. -- View this message in context: http://drools.46999.n3.nabble.com/Insert-an-object-containing-a-HashMap-t... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users