Re: [Info-gnuprologjava] Problem on firing a query

[Daniel Thomas]

Since I don't have the prolog file which defines the limited_history
predicate when I try to run the code you sent me I get an existence
error because the predicate is not defined. (the meaning of
existence_error is defined in the prolog standard)

If you switch your runOnce for a prepareGoal and then execute then you
will get the actual correct error rather than an unhelpful one.

Daniel

On Fri, 2012-06-01 at 08:59 +0000, Jagadish Koneti wrote:
> Hello , 
> 
>  Thank you for the reply . can you please elaborate on what exactly " 
> error(existence_error(procedure,limited_history / 2),error) " implies ? . we 
> have understood that limited_history is a 2 array predicate but we are unable 
> to comprehend more than that .
> 
> 
> Thanks 
> Jagadish koneti 
> Infosys , Bangalore . 
> 
> 
> 
> -----Original Message-----
> From: address@hidden [mailto:address@hidden On Behalf Of Daniel Thomas
> Sent: Thursday, May 31, 2012 2:10 AM
> To: Suman Roy
> Cc: address@hidden
> Subject: Re: [Info-gnuprologjava] Problem on firing a query
> 
> So this is the runOnce causing unhelpful error messages problem again. 
> 
> Also:
> >            catch (Exception e) {
> > 
> >                   System.out.println("fail");
> > 
> >             }
> Is bad practice and very unhelpful for debugging.
> 
> After fixing that and using prepareGoal and then execute.
> 
> gnu.prolog.vm.PrologException:
> error(existence_error(procedure,limited_history / 2),error)
>       at gnu.prolog.vm.PrologException.getError(PrologException.java:129)
>       at gnu.prolog.vm.PrologException.getError(PrologException.java:118)
>       at
> gnu.prolog.vm.PrologException.existenceError(PrologException.java:155)
>       at
> gnu.prolog.vm.UndefinedPredicateCode.execute(UndefinedPredicateCode.java:62)
>       at
> gnu.prolog.vm.interpreter.InterpretedByteCode.execute(InterpretedByteCode.java:522)
>       at
> gnu.prolog.vm.interpreter.Predicate_call.staticExecute(Predicate_call.java:144)
>       at gnu.prolog.vm.Interpreter.execute(Interpreter.java:507)
>       at Fresh_06.main(Fresh_06.java:74)
> 
> Which makes it fairly clear as to what the problem is.
> 
> You might get a different error as "D:/RSAE/latest-rule_11.pl" might exist on 
> your computer.
> 
> I hope that helps,
> 
> Daniel
> 
> On Mon, 2012-05-28 at 16:44 +0530, Suman Roy wrote:
> > Hi,
> > 
> >  
> > 
> > We are using the following code to generate the query
> > 
> >  
> > 
> > “limited_history(H,5),happens3(end(dofulfillmentProcess1),_,H).”
> > 
> >  
> > 
> > This has to be fired on prolog rules (attached) written for business 
> > artifact. However, when this query is fired through gnuprolog java JAR 
> > file, it is showing that
> > 
> > “the current goal is not active’.
> > 
> >  
> > 
> > But this query works fine when we fire them directly to prolog!
> > 
> >  
> > 
> > Can you please tell us what is the problem?
> > 
> >  
> > 
> > Thanks and regards,
> > 
> > --Suman
> > 
> >  
> > 
> >  
> > 
> > ====================================
> > 
> >  
> > 
> >  
> > 
> > package RSAE.util;
> > 
> >  
> > 
> > import gnu.prolog.term.AtomTerm;
> > 
> > import gnu.prolog.term.CompoundTerm;
> > 
> > import gnu.prolog.term.CompoundTermTag;
> > 
> > import gnu.prolog.term.IntegerTerm;
> > 
> > import gnu.prolog.term.Term;
> > 
> > import gnu.prolog.term.VariableTerm;
> > 
> > import gnu.prolog.vm.Environment;
> > 
> > import gnu.prolog.vm.Interpreter;
> > 
> > import gnu.prolog.vm.PrologCode;
> > 
> >  
> > 
> > public class Fresh_06 {
> > 
> >  
> > 
> >       public static void main(String[] args) {
> > 
> >  
> > 
> >             
> > 
> >            
> > 
> > //limited_history(H,5),happens3(end(dofulfillmentProcess1),_,H).
> > 
> >             try {
> > 
> >                   VariableTerm H = new VariableTerm();
> > 
> >                   gnu.prolog.vm.Environment gve = new Environment();
> > 
> > 
> > gve.ensureLoaded(AtomTerm.get("D:/RSAE/latest-rule_11.pl"));
> > 
> >                   Interpreter in = gve.createInterpreter();
> > 
> >                   gve.runInitialization(in);
> > 
> >                   
> > 
> >                   
> > 
> >                   Term lHistory[] = { H, new IntegerTerm(5) };
> > 
> >                   CompoundTerm lTerm = new 
> > CompoundTerm("limited_history", lHistory);
> > 
> >                   //replace with process code works
> > 
> >                   Term t1[] = { AtomTerm.get("sendFreightInvoice1") };
> > 
> >                   CompoundTerm cTerm2 = new CompoundTerm(",", 2);
> > 
> >                   CompoundTerm ct1 = new CompoundTerm("end", t1);
> > 
> >                   CompoundTerm gTerm1 = new 
> > CompoundTerm(CompoundTermTag.get(
> > 
> >                               "happens3", 3), ct1, new VariableTerm(), 
> > H);
> > 
> >  
> > 
> >                   cTerm2.args[0] = lTerm;
> > 
> >                   cTerm2.args[1] = gTerm1;
> > 
> >                   int rc = in.runOnce(cTerm2);
> > 
> >  
> > 
> >                   if (rc == PrologCode.SUCCESS || rc ==
> > PrologCode.SUCCESS_LAST) {
> > 
> > System.out.println("success");
> > 
> >                   }
> > 
> >             }
> > 
> >  
> > 
> >             catch (Exception e) {
> > 
> >                   System.out.println("fail");
> > 
> >             }
> > 
> >       }
> > 
> > }
> > 
> >  
> > 
> > ========================================
> > 
> >  
> > 
> > 
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