Ok so i've been able to further down isolate the problem. It is created by a call to the FuzzySet class. When i do something like the example: double xHot[] = {25, 35}; double yHot[] = {0, 1}; double xCold[] = {5, 15}; double yCold[] = {1, 0}; FuzzyValue fval = null; FuzzyVariable temp = new FuzzyVariable("temperature", 0, 100, "C"); temp.addTerm("hot", xHot, yHot, 2); temp.addTerm("cold", xCold, yCold, 2); Everything works fine, but if i do something like ; FuzzyVariable temp = new FuzzyVariable("temperature", 0, 100, "C"); temp.addTerm("hot", PIFuzzySet(5,0.5)); I get an error, because i use PIFuzzySet (a subclass of FuzzySet) instead of FuzzySet... So why would this work when running locally on a custom executable program, but not when deployed and accessed through the webserver? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4041007#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...