JESS: Intermittent error: Nested exception is null

[Patricia Charlton]

Hi there,

I'm developing an inference engine using JESS. I am using protege and  
JESS TAB integration and running JESS from the protege environment.

Occasionally I get an error nested exception is: null. It does not  
happen each time I run the application and I have tested each part  
independently. It is also not always with the same inference about a  
particular concept.

Is there a known problem between the integration environment where for  
example concept pointers may get dropped?

I am currently at a loss as to how to fix this. It maybe a problem  
with protege/jess or jess tab.

(current environment is MAC, Protege 3.4 and Jess 7.1)

Any help or pointers at this stage would be great.

Kind regards,
Patricia



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