Initialise List/Set/Map as null (#1461)

* Initialise List/Set/Map as null

* Revert unwanted changes (StoredPaymentMethod)

* Remove new Donation type from patch

Author: gcatanese

src/main/java/com/adyen/model/checkout/Amounts.java

@@ -40,7 +40,7 @@ public class Amounts {
   private String currency;
 
   public static final String JSON_PROPERTY_VALUES = "values";
-  private List<Long> values = new ArrayList<>();
+  private List<Long> values;
 
   public Amounts() { 
   }

src/main/java/com/adyen/model/checkout/BalanceCheckRequest.java

@@ -101,7 +101,7 @@ public class BalanceCheckRequest {
   private Amount additionalAmount;
 
   public static final String JSON_PROPERTY_ADDITIONAL_DATA = "additionalData";
-  private Map<String, String> additionalData = new HashMap<>();
+  private Map<String, String> additionalData;
 
   public static final String JSON_PROPERTY_AMOUNT = "amount";
   private Amount amount;
@@ -140,7 +140,7 @@ public class BalanceCheckRequest {
   private Installments installments;
 
   public static final String JSON_PROPERTY_LOCALIZED_SHOPPER_STATEMENT = "localizedShopperStatement";
-  private Map<String, String> localizedShopperStatement = new HashMap<>();
+  private Map<String, String> localizedShopperStatement;
 
   public static final String JSON_PROPERTY_MCC = "mcc";
   private String mcc;
@@ -155,13 +155,13 @@ public class BalanceCheckRequest {
   private MerchantRiskIndicator merchantRiskIndicator;
 
   public static final String JSON_PROPERTY_METADATA = "metadata";
-  private Map<String, String> metadata = new HashMap<>();
+  private Map<String, String> metadata;
 
   public static final String JSON_PROPERTY_ORDER_REFERENCE = "orderReference";
   private String orderReference;
 
   public static final String JSON_PROPERTY_PAYMENT_METHOD = "paymentMethod";
-  private Map<String, String> paymentMethod = new HashMap<>();
+  private Map<String, String> paymentMethod;
 
   public static final String JSON_PROPERTY_RECURRING = "recurring";
   private Recurring recurring;
@@ -282,7 +282,7 @@ public static ShopperInteractionEnum fromValue(String value) {
   private String socialSecurityNumber;
 
   public static final String JSON_PROPERTY_SPLITS = "splits";
-  private List<Split> splits = new ArrayList<>();
+  private List<Split> splits;
 
   public static final String JSON_PROPERTY_STORE = "store";
   private String store;

src/main/java/com/adyen/model/checkout/BalanceCheckResponse.java

@@ -44,7 +44,7 @@
 
 public class BalanceCheckResponse {
   public static final String JSON_PROPERTY_ADDITIONAL_DATA = "additionalData";
-  private Map<String, String> additionalData = new HashMap<>();
+  private Map<String, String> additionalData;
 
   public static final String JSON_PROPERTY_BALANCE = "balance";
   private Amount balance;

src/main/java/com/adyen/model/checkout/CardDetailsRequest.java

@@ -52,7 +52,7 @@ public class CardDetailsRequest {
   private String merchantAccount;
 
   public static final String JSON_PROPERTY_SUPPORTED_BRANDS = "supportedBrands";
-  private List<String> supportedBrands = new ArrayList<>();
+  private List<String> supportedBrands;
 
   public CardDetailsRequest() { 
   }

src/main/java/com/adyen/model/checkout/CardDetailsResponse.java

@@ -40,7 +40,7 @@
 
 public class CardDetailsResponse {
   public static final String JSON_PROPERTY_BRANDS = "brands";
-  private List<CardBrandDetails> brands = new ArrayList<>();
+  private List<CardBrandDetails> brands;
 
   public static final String JSON_PROPERTY_FUNDING_SOURCE = "fundingSource";
   private String fundingSource;

src/main/java/com/adyen/model/checkout/CheckoutNativeRedirectAction.java

@@ -41,7 +41,7 @@
 
 public class CheckoutNativeRedirectAction {
   public static final String JSON_PROPERTY_DATA = "data";
-  private Map<String, String> data = new HashMap<>();
+  private Map<String, String> data;
 
   public static final String JSON_PROPERTY_METHOD = "method";
   private String method;

src/main/java/com/adyen/model/checkout/CheckoutRedirectAction.java

@@ -40,7 +40,7 @@
 
 public class CheckoutRedirectAction {
   public static final String JSON_PROPERTY_DATA = "data";
-  private Map<String, String> data = new HashMap<>();
+  private Map<String, String> data;
 
   public static final String JSON_PROPERTY_METHOD = "method";
   private String method;

src/main/java/com/adyen/model/checkout/CheckoutSDKAction.java

@@ -46,7 +46,7 @@ public class CheckoutSDKAction {
   private String paymentMethodType;
 
   public static final String JSON_PROPERTY_SDK_DATA = "sdkData";
-  private Map<String, String> sdkData = new HashMap<>();
+  private Map<String, String> sdkData;
 
   /**
    * The type of the action.

src/main/java/com/adyen/model/checkout/CheckoutSessionInstallmentOption.java

@@ -89,13 +89,13 @@ public static PlansEnum fromValue(String value) {
   }
 
   public static final String JSON_PROPERTY_PLANS = "plans";
-  private List<PlansEnum> plans = new ArrayList<>();
+  private List<PlansEnum> plans;
 
   public static final String JSON_PROPERTY_PRESELECTED_VALUE = "preselectedValue";
   private Integer preselectedValue;
 
   public static final String JSON_PROPERTY_VALUES = "values";
-  private List<Integer> values = new ArrayList<>();
+  private List<Integer> values;
 
   public CheckoutSessionInstallmentOption() { 
   }

src/main/java/com/adyen/model/checkout/CreateCheckoutSessionRequest.java

@@ -124,10 +124,10 @@ public class CreateCheckoutSessionRequest {
   private Amount additionalAmount;
 
   public static final String JSON_PROPERTY_ADDITIONAL_DATA = "additionalData";
-  private Map<String, String> additionalData = new HashMap<>();
+  private Map<String, String> additionalData;
 
   public static final String JSON_PROPERTY_ALLOWED_PAYMENT_METHODS = "allowedPaymentMethods";
-  private List<String> allowedPaymentMethods = new ArrayList<>();
+  private List<String> allowedPaymentMethods;
 
   public static final String JSON_PROPERTY_AMOUNT = "amount";
   private Amount amount;
@@ -142,7 +142,7 @@ public class CreateCheckoutSessionRequest {
   private BillingAddress billingAddress;
 
   public static final String JSON_PROPERTY_BLOCKED_PAYMENT_METHODS = "blockedPaymentMethods";
-  private List<String> blockedPaymentMethods = new ArrayList<>();
+  private List<String> blockedPaymentMethods;
 
   public static final String JSON_PROPERTY_CAPTURE_DELAY_HOURS = "captureDelayHours";
   private Integer captureDelayHours;
@@ -221,10 +221,10 @@ public static ChannelEnum fromValue(String value) {
   private FundRecipient fundRecipient;
 
   public static final String JSON_PROPERTY_INSTALLMENT_OPTIONS = "installmentOptions";
-  private Map<String, CheckoutSessionInstallmentOption> installmentOptions = new HashMap<>();
+  private Map<String, CheckoutSessionInstallmentOption> installmentOptions;
 
   public static final String JSON_PROPERTY_LINE_ITEMS = "lineItems";
-  private List<LineItem> lineItems = new ArrayList<>();
+  private List<LineItem> lineItems;
 
   public static final String JSON_PROPERTY_MANDATE = "mandate";
   private Mandate mandate;
@@ -239,7 +239,7 @@ public static ChannelEnum fromValue(String value) {
   private String merchantOrderReference;
 
   public static final String JSON_PROPERTY_METADATA = "metadata";
-  private Map<String, String> metadata = new HashMap<>();
+  private Map<String, String> metadata;
 
   /**
    * Indicates the type of front end integration. Possible values: * **embedded** (default): Drop-in or Components integration * **hosted**: Hosted Checkout integration
@@ -419,7 +419,7 @@ public static ShopperInteractionEnum fromValue(String value) {
   private Boolean splitCardFundingSources = false;
 
   public static final String JSON_PROPERTY_SPLITS = "splits";
-  private List<Split> splits = new ArrayList<>();
+  private List<Split> splits;
 
   public static final String JSON_PROPERTY_STORE = "store";
   private String store;