After 4 days of struggle, I found out that Helloworld program that drools generates is infact HELLworld. Source of issue is "classpath". Following are links that better explains this problem, than what is listed in Drools wiki (or documentation).
http://www.javacodegeeks.com/2012/02/jboss-drools-getting-started.html http://hocinegrine.com/2013/08/21/eclipse-maven-drools-5-5-0-final-example/ -- View this message in context: http://drools.46999.n3.nabble.com/Null-pointer-exception-when-adding-drools-to-existing-project-tp4027944p4028011.html Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users