> I wonder if anyone else running Jess with RePast has encountered a
> similar problem.
When people have trouble using Jess with one java library or another,
such as repast, the problems tend to be generic java problems, e.g.
missing library on the classpath, methods throwing exceptions
unexpectedly, etc.
These kinds of exception bubble up to the top level exception handler,
which will always be Jess if you are instantiating object or calling
methods from jess script. This doesn't mean Jess has a "problem" with
the underlying library, Jess is simply the messenger of bad news.
My SWAG is that the repast library or something it depends on is not in
your classpath or that a static initializer is failing somewhere along
the way.
Good luck!
alan
Scott Moss wrote:
Hi.
In starting to sort out how to run Jess from Java as you suggested, I
first ran the test file from Jess command line in a bash shell. The
error message was now:
Jess> (batch testing.clp)
(deftemplate MAIN::agent
"$JAVA-OBJECT$ org.cfpm.markets.User"
(declare (from-class org.cfpm.markets.User))
(multislot attribute_demands)
(slot class)
(multislot location)
(slot name)
(slot OBJECT))
Jess reported an error in routine new
while executing (new User "harvey")
while executing (bind ?user-agent (new User "harvey"))
while executing (batch testing.clp).
Message: Constructor threw an exception.
Program text: ( batch testing.clp ) at line 1.
Nested exception is:
uchicago/src/sim/util/Random
So from Eclipse, the nexted exception is reported as null -- I guess it
isn't picking up the actual error -- while from the command line call it
reports the class giving rise to the exception -- though not the
exception itself. So I dropped the random number generator I was using
(from RePast) and substituted from the standard Java Random class and
this solved the problem.
regards
scott
friedman_hill ernest j wrote:
I think Scott Moss wrote:
Jess reported an error in routine new
while executing (new User "harvey")
while executing (bind ?user-agent (new User "harvey")).
Message: Constructor threw an exception.
Program text: ( bind ?user-agent ( new User "harvey" ) ) at line 16.
Nested exception is:
null
Run Jess like this:
java jess.Main -stacktrace myfile.clp
and you'll get a more detailed traceback. You should see the actual
stack trace of the exception the constructor throws. That will surely
give us a clue.
---------------------------------------------------------
Ernest Friedman-Hill Advanced Software Research Phone: (925)
294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://herzberg.ca.sandia.gov
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