Indeed. This is a bug in the special-case handling for defglobals on
rule LHSs. I'll make sure to get this right in the next release. For
now, you might have to just avoid referring to a defglobal more than
once on any given rule LHS. You could push the test down to the RHS,
or you could move the defglobal into a fact. Thanks for the report.
I think Jacek Gwizdka wrote:
>
> Hi Jess Users!
>
> I am seeing a strange error in the following test CE :
>
> a) Works OKAY:
> (test (eq (call ?*object* getValue) (get-member ?*constants* CONST_1)) )
>
> b) Gives NullPointer ERROR:
> (test (or (eq (call ?*object* getValue) (get-member ?*constants* CONST_1))
>
> (eq (call ?*object* getValue) (get-member ?*constants* CONST_2))))
>
>
>
> All variables have the same values in both cases.
> I stepped through Jess (using 5.0a4 )code to the line where it fails:
>
> jess\Funcall.java:
>
> class ExtractGlobal implements Userfunction, Serializable {
> ....
> public Value call(ValueVector vv, Context context) throws
> ReteException
> {
> return context.findBinding(vv.get(1).stringValue()).m_val;
> <================
> }
> }
>
>
> in jess\Context.java:
>
> Binding findBinding(String key)
> {
> Context c = this;
> while (c != null)
> {
> Binding b = (Binding) c.getBindings().get(key);
> if (b != null)
> return b;
> else
> c = c.m_parent; <===== NULL ????
> }
> return null;
> }
>
> When, in the case b), it is trying to find bindings for ?*object* second
> time around in the while loop c is null, whereas in the case a) it is
> getting the correct value. Any ideas what the problem might be?
>
> Thanks,
> -- Jacek
>
>
>
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
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PO Box 969 http://herzberg.ca.sandia.gov
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