[rules-users] unmarshal global variable

[Wolfgang Laun]

The crucial info is: what is in the first table, how do you insert this data?
Is it a DRL global? A fact? How does the (generated) rule look like?
-W

On 07/01/2013, acormond <acormond at greatdanetrailers.com> wrote:
> Gentlepeople,
>
> I am fairly new to Drools and have what I hope is a simple question.  I am
> attempting to marshal (serialize) a Drools knowledge session and then
> unmarshall it.  The marshalling works but the unmarshalling fails with a
> null pointer exception.  The error is apparently with unmarshalling a
> global
> variable in the session.
>
> The session is created from a spreadsheet (decision table).  This
> spreadsheet
> has two RuleTables.  The first of these exists solely so that I can enter
> some
> constants into the session, specifically the name and price of the product
> the
> spreadsheet is dealing with.  The second ruletable is where the rules are
> specified.  The exception occurs when unmarshalling the first rule in the
> first
> rule table.  If, as a test, I eliminate the first rule table, then I can
> successfully marshal and unmarshall the session.
>
> The marshalling is done using the following, simplified, code:
>
>   Marshaller marshaller = MarshallerFactory.newMarshaller(kbase);
>   File droolsSessionFile = new File(MARSHAL_FILE);
>   foStream = new FileOutputStream(droolsSessionFile);
>   baos = new ByteArrayOutputStream();
>   marshaller.marshall(baos, ksession);
>   baos.writeTo(foStream);
>
> and the unmarshalling is done like this:
>
>   Marshaller marshaller =
> MarshallerFactory.newMarshaller(pricingProcessor.getKnowledgeBase());
>   FileInputStream fis = new FileInputStream(MARSHAL_FILE);
>   StatefulKnowledgeSession ksession = marshaller.unmarshall(fis);
>
>
> So, where did I go wrong?  Perhaps I need to deal with the global variable
> differently, perhaps by putting it in the knowledgeBase before I unmarshall
> the session?
>
> Thank you for any help.
>
> Alex Ormond
>
>
>
>
> --
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