[rules-users] Cannot invoke method because of ArrayIndexOutOfBoundsException

[Wolfgang Laun]

Nice try - but, please, don't. Kindly post the code that actually
causes your problem.

-W


On 06/03/2013, Bojan Janisch <bojan.janisch at scai.fraunhofer.de> wrote:
> Hello Guys,
>
> sorry to bother you with this problem, but I'm out of ideas.
> I'm using Drools in textmining-context and in basic I have
> a function that checks 2 named entites for equality to
> ensure that the entities are all different and that the rules
> do work only on different named entity objects:
>
> public static boolean isEqual(Annotation a, Annotation b){
> if(a.equals(b)){
>    return true;
> }
> 	
> return false;
> }
>
> Sometimes there are conditions that need tests of more than
> 2 named entites. For this I've written a super method that
> calls the isEqual method in a loop:
>
> public static boolean isEqual(Annotation... a){
> ArrayList<Annotation> outLoop = new
> ArrayList<Annotation>(Arrays.asList(a));
> ArrayList<Annotation> inLoop = new ArrayList<Annotation>(Arrays.asList(a));
> 		
> for (Annotation anno1 : outLoop) {
>    inLoop.remove(anno1);
>    for (Annotation anno2 : inLoop) {
>       if(isEqual(anno1,anno2)){
>       return true;
>       }
>    }
> }
>
> return false;
> }
>
>
> My rules could (theoretically) now call the function
> eval(isEqual($ne1,$ne2)) or
> eval(isEqual($ne1,$ne2,$ne3) or even
> eval(isEqual($ne1,$ne2,$ne3,$ne4,$ne5)) and so on.
>
> So there starts my problem:
>
> Each time I'm getting an ArrayIndexOutOfBounds Exception from the second
> method that looks like this:
>
> java.lang.RuntimeException: cannot invoke method: isEqual
>         ...
> 	at java.lang.Thread.dispatchUncaughtException(Thread.java:1888)
> Caused by: java.lang.ArrayIndexOutOfBoundsException: 3
> 	at
> org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.executeAll(MethodAccessor.java:149)
> 	at
> org.mvel2.optimizers.impl.refl.nodes.MethodAccessor.getValue(MethodAccessor.java:48)
> 	at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:108)
> 	at
> org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:38)
>         ...
>
> Could someone explain me what's wrong with my code? Thanks for any help.
>
> Greetings
> JB
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