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/
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