Merge branch '5.4.x' into 6.0.x

samples/client/petstore/java/webclient-nulable-arrays/src/main/java/org/openapitools/client/ApiClient.java

@@ -424,6 +424,7 @@ public class ApiClient extends JavaTimeFormatter {
         }
 
         if (value instanceof Map) {
+            @SuppressWarnings("unchecked")
             final Map<String, Object> valuesMap = (Map<String, Object>) value;
             for (final Entry<String, Object> entry : valuesMap.entrySet()) {
                 params.add(entry.getKey(), parameterToString(entry.getValue()));

samples/client/petstore/java/webclient-nulable-arrays/src/main/java/org/openapitools/client/model/ByteArrayObject.java

@@ -58,6 +58,8 @@ public class ByteArrayObject {
   public static final String JSON_PROPERTY_INT_FIELD = "intField";
   private BigDecimal intField;
 
+  public ByteArrayObject() { 
+  }
 
   public ByteArrayObject nullableArray(byte[] nullableArray) {
     this.nullableArray = JsonNullable.<byte[]>of(nullableArray);