Re: [rules-users] Planner has trouble creating a configurer: how to debug

I tried to create a solver from XML configuration. But the entire process returns a *cryptic error message *that makes no sense. How do I fix this? And how can I make sense of this to actually solve similar problems like this? Please excuse me if I made any bad karma. This is my first post on this (and any) mailing list. jesvin@Jesvin-Technovia:~/dev/drools/sudoku$ java App Exception in thread "main" java.lang.NullPointerException at org.drools.planner.core.domain.solution.SolutionDescriptor.processPropertyAnnotations(SolutionDescriptor.java:69) at org.drools.planner.core.domain.solution.SolutionDescriptor.<init>(SolutionDescriptor.java:61) at org.drools.planner.config.solver.SolverConfig.buildSolutionDescriptor(SolverConfig.java:197) at org.drools.planner.config.solver.SolverConfig.buildSolver(SolverConfig.java:167) at org.drools.planner.config.XmlSolverConfigurer.buildSolver(XmlSolverConfigurer.java:103) at App.createSolver(App.java:62) at App.main(App.java:40) The function that throws it is listed here. The line is of course `return configurer.buildSolver();`. private static Solver createSolver(){ XmlSolverConfigurer configurer = new XmlSolverConfigurer(); File file = new File("solver.xml"); FileInputStream fin = null; try{ fin = new FileInputStream(file); } catch(IOException e){ System.out.println("Unable to read drl"); } configurer.configure(fin); //configurer.configure("/home/jesvin/dev/drools/sudoku/solver.xml"); return configurer.buildSolver(); } The content of the XML: <?xml version="1.0" encoding="UTF-8"?> <solver> <environmentMode>DEBUG</environmentMode> <solutionClass>domain.Sudoku</solutionClass> <planningEntityClass>domain.Digit</planningEntityClass> <scoreDrl>score.drl</scoreDrl> <scoreDefinition> <scoreDefinitionType>SIMPLE</scoreDefinitionType> </scoreDefinition> <termination> <scoreAttained>0</scoreAttained> </termination> <constructionHeuristic> <constructionHeuristicType>FIRST_FIT</constructionHeuristicType> <moveFactoryClass>solution.RowChangeMoveFactory</moveFactoryClass> </selector> <acceptor> <completeSolutionTabuSize>1000</completeSolutionTabuSize> </acceptor> <forager> </forager> </localSearch> </solver> -- View this message in context: http://drools.46999.n3.nabble.com/Planner-has-trouble-creating-a-configur... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users