I am surprise that when there is no value in BestCategory, it gives me no
error and when the rule executes and value comes in BestCategory, it gives
me now *"RequiredLiteralException*"
The code I used here is
OntProperty favcat=model2.getOntProperty(ns+ "BestCategory");
RDFNode phFav=indiv.getPropertyValue(favcat);
if (phFav!=null){
Literal l1=phFav.asLiteral();
s1=l1.toString();}
if (s1=="CatPhysics"){
JOptionPane.showMessageDialog(null, "Physics");
}
Best regards
On Tue, Jan 17, 2017 at 5:53 PM, Sidra shah <[email protected]> wrote:
> Hello Chris, thanks a lot for your suggestion.
>
> Best regards.
>
> On Tue, Jan 17, 2017 at 5:37 PM, Chris Dollin <
> [email protected]> wrote:
>
>>
>>
>> On 17/01/17 13:30, Sidra shah wrote:
>>
>>> Hi Lorenz, I am sorry but with much regards, you discussed here the
>>> problem, not the solution :) :)
>>>
>>> I know this if there is no value, there must be Null exception,
>>>
>>
>> This is not true.
>>
>> but can you suggest me a way where we dodge the compiler
>>>
>>
>> No "dodging" of the compiler is required. Instead, just write
>> perfectly ordinary code that tests to see if the result of
>> getPropertyValue is null, and take one action if it isn't and
>> a different one if it is.
>>
>> There's nothing special about this. You don't need to use
>> break (which is for escaping from loops); just an if
>> with suitable then and else parts.
>>
>> I know this is more a Java problem, but any help I will appreciate.
>>>
>>
>> Find someone /local/ doing the same or similar course and talk to
>> them (and have them talk to you) about programming and this
>> problem. I don't mean copy each other's work; I mean use each
>> other to understand what the problem is about and how the code
>> works. Each of you will know things that the other doesn't; share.
>>
>> Chris
>>
>> --
>> "He could not weigh up which was worse and so tried not to think about
>> either."
>> /The Spellgrinder's
>> Apprentice/
>>
>> Epimorphics Ltd, http://www.epimorphics.com
>> Registered address: Court Lodge, 105 High Street, Portishead, Bristol
>> BS20 6PT
>> Epimorphics Ltd. is a limited company registered in England (number
>> 7016688)
>>
>
>
