Hi,
Using exampl from Jess In Action, I code the folloing
in Java, but ios is not working, it throws null
pointer exception of variable Result. PLease advice.
//RULE
merlinMain.r.clear();
merlinMain.r.executeCommand("(do-backward-chaining
r-adv-type)");
merlinMain.r.executeCommand("(defrule
r-adv-type" +
"(need-adv-type ?x ?)" +
"(adv-attr target audience
demographically)" +
"(adv-attr suitable to market time frame
sensitive product)" +
"=>" +
"(assert (adv-type radio-advertisement
radio)))");
merlinMain.r.executeCommand("(defrule
r-adv-type-ask" +
"(adv-type-ask)" +
"(adv-type ?x ?y)" +
"=>" +
"(store result ?x))");
merlinMain.r.reset();
merlinMain.r.executeCommand("(assert
(adv-attr target audience demographically))");
merlinMain.r.executeCommand("(assert
(adv-attr suitable to market time frame sensitive
product))");
merlinMain.r.executeCommand("(assert
(adv-type-ask))");
merlinMain.r.executeCommand("(assert
(adv-type ?x))");
merlinMain.r.run();
Value va =
merlinMain.r.executeCommand("(facts)");
String str1 =
merlinMain.r.fetch("result").stringValue(merlinMain.r.getGlobalContext());
System.out.println("----"+str1);
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