[jgap-users] Salesman: exception thrown when running algorithm twice in a program.

[Mark S. <mar...@ya...>]

Hello. I have a problem with Salesman class of JGAP. I have a subclass that works fine when I run the algorithm once, but if I run it again in the program, exceptions are thrown:

java.lang.RuntimeException: Fitness evaluator has already been set differently.
Maybe org.jgap.DefaultFitnessEvaluator.hashCode() is not implemented accordingly.
    at org.jgap.Configuration.checkProperty(Configuration.java:459)
    at org.jgap.Configuration.setFitnessEvaluator(Configuration.java:1166)
    at org.jgap.impl.salesman.Salesman.createConfiguration(Salesman.java:132)
    at org.jgap.impl.salesman.Salesman.findOptimalPath(Salesman.java:218)

I tried to use a static FitnessEvaluator so it "is not set differently", but I get similar exceptions with FitnessFunction, Chromosome etc.

Looking up in the code, I see that a System property is set and if it is changed the exception is thrown. I don't understand the purpose of that, but I makes impossible to run more than once the algorithm.

So how can I run Salesman.findOptimalPath() twice in a program?

Thanks!

 		
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