Re: JESS: Function Parameters

Hi Derek,

I'm trying to figure out where the problem might lie. Is the problem  
that "eq" an overloaded method, and Jess is calling the wrong  
overload? Jess can correctly call a method that takes a char as an  
argument, and in fact, it's smart enough to prefer the "char" overload  
if the argument is a one-character string. Or is it something else?  
I'm not sure what throws the ClassCastExcepton and why. Some code  
would help me understand!

On Feb 16, 2011, at 3:14 PM, Derek Adams wrote:

> Hello Jess-Users,
>
> I have small jess/java issue that is causing quite a big problem.
>
> (call (call ?hcu joinTo "projectStatus") eq "active" Y)
>
> The jess code above is performing the following:
>
> 1.  In the inner "call", it is calling the joinTo function on the  
> instance of the HibernateCritieriaUtil object, with a parameter of  
> "projectStatus".
> 2.  That call returns another HibernateCritieriaUtil instance to be  
> used in the outer "call".
> 3.  The outer "call" is calling the eq function with 2 parameters,  
> "active" and Y.
>
> The problem is coming when the function interprets Y as a string.   
> "active" represents a column in the bean mapping and has a type of  
> char.
> So when it compares "active" with a string Y, it throws a  
> ClassCastException: type String cannot be cast to type char
>
> Suggestions?
>
> -- 
> Derek Adams
> Lead Developer
> Arahant LLC
> Work: 615-376-5500 ext. 314
> Cell: 270-543-0920

---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences          Phone: (925) 294-2154
Sandia National Labs
PO Box 969, MS 9012                            [email protected]
Livermore, CA 94550                             http://www.jessrules.com





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