output: #fixed code
                                @Test
    public void test2() throws JMException {
      double epsilon = 0.000000000000001;
      Settings GDE3Settings = new GDE3_Settings("Fonseca");
      GDE3 algorithm = (GDE3) GDE3Settings.configure(configuration_);
  
      DifferentialEvolutionCrossover crossover =
        (DifferentialEvolutionCrossover) algorithm.getCrossoverOperator();
  
      Assert.assertEquals("GDE3_SettingsTest", 100, algorithm.getPopulationSize());
      Assert.assertEquals("GDE3_SettingsTest", 250, algorithm.getMaxIterations());
  
      Assert.assertEquals("GDE3_SettingsTest", 0.5, crossover.getCr(), epsilon);
      Assert.assertEquals("GDE3_SettingsTest", 0.5, crossover.getF(), epsilon);
    }
input: #vulnerable code 
                                @Test
    public void test2() throws JMException {
      double epsilon = 0.000000000000001;
      Settings GDE3Settings = new GDE3_Settings("Fonseca");
      Algorithm algorithm = GDE3Settings.configure(configuration_);
      //Problem problem = new Fonseca("Real");
  
      DifferentialEvolutionCrossover crossover = (DifferentialEvolutionCrossover)algorithm.getOperator("crossover") ;
      double CR = (Double)crossover.getParameter("CR") ;
      double F = (Double)crossover.getParameter("F") ;
  
      Assert.assertEquals("GDE3_SettingsTest", 100, ((Integer)algorithm.getInputParameter("populationSize")).intValue());
      Assert.assertEquals("GDE3_SettingsTest", 250, ((Integer)algorithm.getInputParameter("maxIterations")).intValue());
  
      Assert.assertEquals("GDE3_SettingsTest", 0.5, CR, epsilon);
      Assert.assertEquals("GDE3_SettingsTest", 0.5, F, epsilon);
    } 
                              #location 8 
                              #vulnerability type NULL_DEREFERENCE