Common causes:
- Use of HashSet in your Solution class.
- Combination of Simulated Annealing with time spend termination (clearly documented in manual)

Op 12-02-13 12:08, Michiel Vermandel schreef:
Hi,

Using Planner 5.5.0-Final, currently my environmentMode is set to DEBUG.
As I read here (http://docs.jboss.org/drools/release/5.5.0.Final/drools-planner-docs/html_single/#d0e3120) this mode should produce a reproducible result.
Though, even with o nly the construction phase enabled, I get different results from sequential runs on the same machine with the same code.
Of course full solution (with LocalSearch) results in different outcome too.

How is this possible?

Thanks


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