Thanks Colin, I just applied this patch. Your JMS integration project
sounds pretty interesting, and would make (at least) a good demo of the
capabilities of Workflow.
Craig
On Tue, 13 Nov 2001, *Colin Sharples wrote:
> Date: Tue, 13 Nov 2001 10:20:01 +1300
> From: *Colin Sharples <[EMAIL PROTECTED]>
> Reply-To: Jakarta Commons Developers List <[EMAIL PROTECTED]>
> To: "Jakarta Commons Developers List (E-mail)"
> <[EMAIL PROTECTED]>
> Subject: Workflow
>
> Craig,
>
> I think there's a bug in BaseDescriptor. The doc for BaseDescriptor.get()
> says:
> "Return the value specified by this Descriptor from the specified Context.
> If there is no such value, return null."
> However, JXPath (or at least the version which I have) has two modes for
> getting values, strict and lenient. In strict mode (the default), if you
> have a path such as "foo/bar/quux", and the bar property is null,
> JXPathContext.getValue() will throw a runtime exception rather than return
> null. I think the latter behaviour is what BaseDescriptor is expecting, so
> in BaseDescriptor.get() you need to change
>
> JXPathContext jpc = context.getJXPathContext();
> return (jpc.getValue("local/" + xpath));
>
> to
>
> JXPathContext jpc = context.getJXPathContext();
> jpc.setLenient(true);
> return (jpc.getValue("local/" + xpath));
>
> BTW, I've been working on an implementation of the workflow system, which
> definitely rocks. I've created an execution environment based on JMS -
> activities are triggered by messages arriving on queues. I'm not sure what
> the attitude of the client I'm working for is, but I may be able to submit
> the generic JMS stuff I've been working on when I'm finished (mid-December).
>
> Colin Sharples
> IBM Global Services New Zealand.
>
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