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

[Jagadish Koneti]

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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