Est ce que tu vois ce qui cloche? Merci Voici le log : ERROR|19:13:35,442|InProcessSimulatorLauncher.java|484|localSimulateSameThread|Error during simulation java.lang.NullPointerException at fr.ifremer.isisfish.simulator.PopulationMonitor.getRecruitment(PopulationMonitor.java:236) at simulators.DefaultSimulator.computeMonth(DefaultSimulator.java:436) at simulators.DefaultSimulator.simulate(DefaultSimulator.java:218) at simulators.SimulatorEffortByCell.simulate(SimulatorEffortByCell.java:51) at fr.ifremer.isisfish.simulator.launcher.InProcessSimulatorLauncher.localSimulateSameThread(InProcessSimulatorLauncher.java:441) at fr.ifremer.isisfish.simulator.launcher.InProcessSimulatorLauncher$SimThread.run(InProcessSimulatorLauncher.java:271) INFO|19:13:35,458|InProcessSimulatorLauncher.java|513|localSimulateSameThread|Simulation time: 5.263 INFO|19:13:35,458|IsisCacheBackendOnGuava.java|239|adjustedCache|Cache size ajusted to 1,586Ko (equivalent to 2 step need) INFO|19:13:35,474|InProcessSimulatorLauncher.java|202|message|Simulation terminée INFO|19:13:35,474|SimulationControl.java|206|setText|Simulation terminée et voici l equation qui compile: // forced recruitment each year int y = context.getSimulationControl().getStep().getYear(); double[] poly08 = {0,0.072,0.038,0.068,0.03,0.034,0.083,0.016,0,0.008,0.01,0,0.015,0,0.046,0,0.035,0,0,0,0.034,0.053,0.031,0.03,0.036,0,0.024,0,0.063,0,0,0.03,0.132,0.076,0,0.039,0,0,0}; double[] poly09 = {0,0.105,0.062,0.061,0.014,0.035,0.063,0.017,0,0,0,0,0.01,0,0.041,0,0.013,0,0,0,0.024,0.061,0.054,0.02,0.033,0.014,0.016,0,0.038,0,0,0.114,0.085,0.045,0,0.035,0.018,0,0.021}; double[] coeffs = {0,0.104,0.03725,0.06975,0.01925,0.0345,0.069,0.01625,0,0.006,0.005,0,0.0115,0,0.041,0,0.03525,0,0,0,0.033,0.07775,0.0535,0.02225,0.03925,0.01075,0.0175,0,0.042,0,0,0.07675,0.08325,0.05025,0,0.026,0.01075,0,0.00975}; // recruitment TS 2008-2010 double [] TSRec ={19488138,60032669}; // from nb at age WGNSSK 2012 // matrix result / zone double val = 38808489; // average 2003-2009 for(Zone zr : zoneRepro){ if(prepro == 1){ if(y<2){ val = TSRec[y]; if(y == 0){ coeffs = poly08; }else { coeffs = poly09;} } String zoneName = zr.getName(); String indice = zoneName.replaceAll("Poly([0-9]+)", "$1"); int i = Integer.parseInt(indice); double valzone = coeffs[i] * val; result.setValue(zr,valzone); } else {result.setValue(zr,0.0);} } return 0; -- Sigrid LEHUTA ~ ><> ~ Ecologie et Modèles pour l'Halieutique IFREMER Nantes Rue de l'Ile d'Yeu - BP 21105, 44311 Nantes Cedex 03, France Tél : 02 40 37 40 09 (N° interne : 8009) Membre de l'Association Française d'Halieutique http://sirs.agrocampus-ouest.fr/AFH/index.php/en "Like all creative activities, modelling gives joy to its maker." A. Saltelli.