review feedback

Author: Marcel Jacek

modules/openapi-generator/src/main/resources/Java/libraries/okhttp-gson/pojo.mustache

@@ -385,7 +385,7 @@ public class {{classname}} {{#parent}}extends {{{.}}} {{/parent}}{{#vendorExtens
       {{#isArray}}
       {{#items.isModel}}
       {{#required}}
-      if (jsonObj.get("{{{baseName}}}") != null && !jsonObj.get("{{{baseName}}}").isJsonNull()) {
+      if (jsonObj.get("{{{baseName}}}") != null{{#isNullable}} && !jsonObj.get("{{{baseName}}}").isJsonNull(){{/isNullable}}) {
         if (!jsonObj.get("{{{baseName}}}").isJsonArray()) {
           throw new IllegalArgumentException(String.format(java.util.Locale.ROOT, "Expected the field `{{{baseName}}}` to be an array in the JSON string but got `%s`", jsonObj.get("{{{baseName}}}").toString()));
         }

samples/client/petstore/java/okhttp-gson/src/main/java/org/openapitools/client/model/AllOfModelArrayAnyOfAllOfLinkListColumn1.java

@@ -204,7 +204,7 @@ public static void validateJsonElement(JsonElement jsonElement) throws IOExcepti
         }
       }
         JsonObject jsonObj = jsonElement.getAsJsonObject();
-      if (jsonObj.get("value") != null && !jsonObj.get("value").isJsonNull()) {
+      if (jsonObj.get("value") != null) {
         if (!jsonObj.get("value").isJsonArray()) {
           throw new IllegalArgumentException(String.format(java.util.Locale.ROOT, "Expected the field `value` to be an array in the JSON string but got `%s`", jsonObj.get("value").toString()));
         }

samples/client/petstore/java/okhttp-gson/src/main/java/org/openapitools/client/model/PetWithRequiredTags.java

@@ -410,7 +410,7 @@ public static void validateJsonElement(JsonElement jsonElement) throws IOExcepti
       } else if (!jsonObj.get("photoUrls").isJsonArray()) {
         throw new IllegalArgumentException(String.format(java.util.Locale.ROOT, "Expected the field `photoUrls` to be an array in the JSON string but got `%s`", jsonObj.get("photoUrls").toString()));
       }
-      if (jsonObj.get("tags") != null && !jsonObj.get("tags").isJsonNull()) {
+      if (jsonObj.get("tags") != null) {
         if (!jsonObj.get("tags").isJsonArray()) {
           throw new IllegalArgumentException(String.format(java.util.Locale.ROOT, "Expected the field `tags` to be an array in the JSON string but got `%s`", jsonObj.get("tags").toString()));
         }