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June 2014

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ECJ Evolutionary Computation Toolkit <[log in to unmask]>
Subject:
Bug in SteadyStateEvolutionState Statistics hierarchy
From:
Eric 'Siggy' Scott <[log in to unmask]>
Date:
Fri, 6 Jun 2014 00:18:56 -0400
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ECJ Evolutionary Computation Toolkit <[log in to unmask]>
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Using the latest SVN revision:

When using the "stat.child.0" syntax to add Statistics instances to
steady-state evolution, the method
SteadyStateEvolutionState.checkStatistics(), which is called from setup(),
assumes that the "base" Parameter passed in will have the
value P_STATISTICS.

In fact, the base Parameter used by SteadyStateEvolutionState.setup() is
null, so we get a NPE during initialization.

A simple fix is to replace "base" with "new Parameter(P_STATISTICS)" in the
call to checkStatistics on line 101.

Cheers,
Siggy

-- 

Ph.D student in Computer Science
George Mason University
http://mason.gmu.edu/~escott8/

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