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POUsing (nb_)setarg/3 with gnu.prolog in Java
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copied!<p>I'm currently trying to use prolog out of java using gnu.prolog (<a href="http://www.gnu.org/software/gnuprologjava/" rel="nofollow noreferrer">http://www.gnu.org/software/gnuprologjava/</a>).</p> <p>Thanks to the great help of <a href="https://stackoverflow.com/users/874024/capellic">CapelliC</a> I now have a prolog program which works perfect for my purpose. The problem is that gnu.prolog does not support <code>reverse/2</code> nor does it support <code>nb_setarg/3</code>. Java will throw an error:</p> <pre><code>Exception in thread "Game" java.lang.IllegalArgumentException: The goal is not currently active </code></pre> <p>It isn't a big issue to implement <code>reverse/2</code> on my own but I have no idea how to replace <code>nb_setarg/3</code> (<code>setarg/3</code> also doesn't work)</p> <p>Here is my prolog code:</p> <pre><code>findPath(_Limit, [Goal | Rest], Goal, Temp, Temp, [Goal | Rest]) :- !. findPath(Limit, [A | Rest], Goal, Cost, Temp, Path) :- path(A,B,C), \+member(B, Rest), NewCosts is (Temp + C), NewCosts < Limit, findPath(Limit, [B, A | Rest], Goal, Cost, NewCosts, Path). searchPath(Start, Goal, Path_to_goal) :- S = path_len([], 50), repeat, arg(2, S, Limit), ( findPath(Limit, [Start], Goal, Cost, 0, Path) -> ( Cost < Limit -> nb_setarg(1, S, Path), nb_setarg(2, S, Cost), fail ) ; true ), arg(1, S, Rev), reverse(Rev, Path_to_goal). </code></pre> <p>I tried to use <code>JPL</code> from <code>SWI Prolog</code> but I wasn't able to run it because of severel exceptions pointing out, that Eclipse wasn't able to find the library correctly. I always get one of the following Exceptions:</p> <pre><code>Exception in thread "main" java.lang.UnsatisfiedLinkError: no jpl in java.library.path UnsatisfiedLinkError: D:\Program Files\Prolog\bin\jpl.dll: Can't find dependent libraries SWI-Prolog: [FATAL ERROR: Could not find system resources] </code></pre> <p>Even after following <a href="https://stackoverflow.com/questions/9751357/jpl-swi-prolog-not-working">this</a> and <a href="https://stackoverflow.com/questions/12283471/jpl-swi-prolog-configuration-failure">this</a> guide I wasn't able to resolve my problems. Neither on Windows (32bit) nor on Ubuntu (64bit).</p> <p>Do you have an solutions for me how I can either get <code>JPL</code> running or how to be able to use <code>nb_setarg/3</code>? Up to now I spent one and a half days without any results. Quite frustrating...</p>

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