#vulnerable code 
                                @Override
    public Object configure(Object c) throws Exception {

        Map config = c instanceof Map ? (Map) c : Collections.EMPTY_MAP;

        final Constructor constructor = getDataBoundConstructor(target);
        if (constructor == null) {
            throw new IllegalStateException(target.getName() + " is missing a @DataBoundConstructor");
        }

        final Parameter[] parameters = constructor.getParameters();
        final String[] names = ClassDescriptor.loadParameterNames(constructor);
        Object[] args = new Object[names.length];

        if (parameters.length > 0) {
            // Many jenkins components haven't been migrated to @DataBoundSetter vs @NotNull constructor parameters
            // as a result it might be valid to reference a describable without parameters

            for (int i = 0; i < names.length; i++) {
                final Object value = config.remove(names[i]);
                if (value == null && parameters[i].getAnnotation(Nonnull.class) != null) {
                    throw new IllegalArgumentException(names[i] + " is required to configure " + target);
                }
                final Class t = parameters[i].getType();
                if (value != null) {
                    if (Collection.class.isAssignableFrom(t)) {
                        if (!(value instanceof List)) {
                            throw new IllegalArgumentException(names[i] + " should be a list");
                        }
                        final Type pt = parameters[i].getParameterizedType();
                        final Configurator lookup = Configurator.lookup(pt);

                        final ArrayList<Object> list = new ArrayList<>();
                        for (Object o : (List) value) {
                            list.add(lookup.configure(o));
                        }
                        args[i] = list;

                    } else {
                        final Type pt = parameters[i].getParameterizedType();
                        final Type k = pt != null ? pt : t;
                        final Configurator configurator = Configurator.lookup(k);
                        if (configurator == null) throw new IllegalStateException("No configurator implementation to manage "+k);
                        args[i] = configurator.configure(value);
                    }
                    System.out.println("Setting " + target + "." + names[i] + " = " + value);
                } else if (t.isPrimitive()) {
                    args[i] = Defaults.defaultValue(t);
                }
            }
        }

        final Object object;
        try {
            object = constructor.newInstance(args);
        } catch (IllegalArgumentException ex) {
             List<String> argumentTypes = new ArrayList<>(args.length);
             for (Object arg : args) {
                argumentTypes.add(arg != null ? arg.getClass().getName() : "null");
             }
             throw new IOException("Failed to construct instance of " + target +
                    ". Constructor: " + constructor.toString() +
                    ". Arguments: " + argumentTypes, ex);
        }

        final Set<Attribute> attributes = describe();

        for (Attribute attribute : attributes) {
            final String name = attribute.getName();
            final Configurator lookup = Configurator.lookup(attribute.getType());
            if (config.containsKey(name)) {
                final Object yaml = config.get(name);
                Object value;
                if (attribute.isMultiple()) {
                    List l = new ArrayList<>();
                    for (Object o : (List) yaml) {
                        l.add(lookup.configure(o));
                    }
                    value = l;
                } else {
                    value = lookup.configure(config.get(name));
                }
                attribute.setValue(object, value);
            }
        }
        return object;
    } 
                            #location 81 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public Object configure(Object c) throws Exception {

        Map config = c instanceof Map ? (Map) c : Collections.EMPTY_MAP;

        final Constructor constructor = getDataBoundConstructor(target);
        if (constructor == null) {
            throw new IllegalStateException(target.getName() + " is missing a @DataBoundConstructor");
        }

        final Parameter[] parameters = constructor.getParameters();
        final String[] names = ClassDescriptor.loadParameterNames(constructor);
        Object[] args = new Object[names.length];

        if (parameters.length > 0) {
            // Many jenkins components haven't been migrated to @DataBoundSetter vs @NotNull constructor parameters
            // as a result it might be valid to reference a describable without parameters

            for (int i = 0; i < names.length; i++) {
                final Object value = config.remove(names[i]);
                if (value == null && parameters[i].getAnnotation(Nonnull.class) != null) {
                    throw new IllegalArgumentException(names[i] + " is required to configure " + target);
                }
                final Class t = parameters[i].getType();
                if (value != null) {
                    if (Collection.class.isAssignableFrom(t)) {
                        if (!(value instanceof List)) {
                            throw new IllegalArgumentException(names[i] + " should be a list");
                        }
                        final Type pt = parameters[i].getParameterizedType();
                        final Configurator lookup = Configurator.lookup(pt);

                        final ArrayList<Object> list = new ArrayList<>();
                        for (Object o : (List) value) {
                            list.add(lookup.configure(o));
                        }
                        args[i] = list;

                    } else {
                        final Type pt = parameters[i].getParameterizedType();
                        final Type k = pt != null ? pt : t;
                        final Configurator configurator = Configurator.lookup(k);
                        if (configurator == null) throw new IllegalStateException("No configurator implementation to manage "+k);
                        args[i] = configurator.configure(value);
                    }
                    System.out.println("Setting " + target + "." + names[i] + " = " + value);
                } else if (t.isPrimitive()) {
                    args[i] = Defaults.defaultValue(t);
                }
            }
        }

        final Object object;
        try {
            object = constructor.newInstance(args);
        } catch (IllegalArgumentException ex) {
             List<String> argumentTypes = new ArrayList<>(args.length);
             for (Object arg : args) {
                argumentTypes.add(arg != null ? arg.getClass().getName() : "null");
             }
             throw new IOException("Failed to construct instance of " + target +
                    ". Constructor: " + constructor.toString() +
                    ". Arguments: " + argumentTypes, ex);
        }

        final Set<Attribute> attributes = describe();

        for (Attribute attribute : attributes) {
            final String name = attribute.getName();
            final Configurator lookup = Configurator.lookup(attribute.getType());
            if (config.containsKey(name)) {
                final Object yaml = config.get(name);
                Object value;
                if (attribute.isMultiple()) {
                    List l = new ArrayList<>();
                    for (Object o : (List) yaml) {
                        l.add(lookup.configure(o));
                    }
                    value = l;
                } else {
                    value = lookup.configure(config.get(name));
                }
                attribute.setValue(object, value);
            }
        }

        for (Method method : target.getMethods()) {
            if (method.getParameterCount() == 0 && method.getAnnotation(PostConstruct.class) != null) {
                method.invoke(object, null);
            }
        }

        return object;
    }