Hi,
I'm sure this is a trivial error and I'm going to kick myself when someone
tells me what I've done wrong, but here goes anyway:
I'm trying to create shadow facts that subclass a deftemplate that's
already been added to the Rete. When I try and add the java bean using
definstance I get a ClassCastException as follows:
java.lang.ClassCastException
at jess.DefinstanceList.createNewShadowFact(DefinstanceList.java:206)
at jess.DefinstanceList.definstance(DefinstanceList.java:275)
at jess.Rete.definstance(Rete.java:1317)
at jess.Rete.definstance(Rete.java:1309)
at
jess.extensions.test.framework.JessTestCase.assertOrder(JessTestCase.java:83)
at
jess.extensions.test.framework.MyTest.testSetTagValue(MyTest.java:175)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
...
I've traced it through and it looks as though (through a beginner's eyes at
least :-) a Value object with an m_object value of "nil" has appeared in
the template so when the DefinstanceList tries to cast it to a
(SerializablePD) it goes bang.
The problem is I don't know where the nil Value is coming from. It always
seems to be the second property that it tries though. The first (a property
of type long) seems to succeed without exception.
Does anyone know why I might be getting this?
Before I try and define the instance, I'm running the following setup code:
executeCommand("(deftemplate orders (slot orderId) (slot Tag8))"); //stub
method that just creates the superclass template I'm trying to extend in
the Rete
rete.defclass("test-orders", "jess.extensions.test.templates.Order",
"orders"); //define the test-orders class as a subclass of "orders" as
defined above
rete.definstance("test-orders", order, true); //create the shadow fact
based on an object of type jess.extensions.test.templates.Order
The first two commands succeed. The third fails with the ClassCastException
shown above.
The Order class itself has about 35 fields, two of which override the slots
created in the deftemplate command shown above. Interestingly, the one
property-to-slot conversion that succeeds before the ClassCastException is
thrown is for the first of these two slots (orderId). It is not an explicit
subclass of any other object - if that makes a difference, which I wouldn't
expect.
Can anyone shed any light on why this is happening and the definstance
fails?
Any help would be very gratefully received.
Thanks in advance
David
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