clipsJNI become "instable" after an error

[Chaubert Jérôme]

HI,

I work with clips JNI 0.5 (with latest bug fix) on windows 7. It seems that a clips Environnement could not be used after an error occurs. More precisely every user's clips function return FALSE. For example, the following java code :

        final Environment clips = new Environment();

        *... load constructs and initialisation...*

        System.out.println("february 2015 = " + clips.eval("(plus1mois 20150101)"));
        clips.eval("(this_function_does_not_exist)");
        System.out.println("2 + 2 = " + clips.eval("(+ 2 2)"));
        System.out.println("february 2015 = " + clips.eval("(plus1mois 20150101)"));

give the following result :

february 2015 = 20150201
[EXPRNPSR3] Missing function declaration for this_function_does_not_exist.
2 + 2 = 4
february 2015 = FALSE

Is it possible to change this ?

[Gary Riley]

You'll need to recompile the jni library. In the file net_sf_clipsrules_jni_Environment.c, modify the Java_net_sf_clipsrules_jni_Environment_eval function to call SetEvaluationError and SetHaltExecution before the call to EnvEval:

   SetEvaluationError(theCLIPSEnv,FALSE);
   SetHaltExecution(theCLIPSEnv,FALSE);   
   EnvEval(theCLIPSEnv,(char *) cEvalStr,&theDO);

If you're using the latest CLIPS source code rather than the code include with CLIPSJNI v0.5, use this code instead:

   EnvSetEvaluationError(theCLIPSEnv,FALSE);
   EnvSetHaltExecution(theCLIPSEnv,FALSE);   
   EnvEval(theCLIPSEnv,(char *) cEvalStr,&theDO);

[Chaubert Jérôme]

Thank you,

It works fine.

Why did you choose to not call these evaluation and halt error functions ? For performance ?

[Gary Riley]

It was an oversight.