[Java] Add import for java.util.Arrays if there is a set property in a model. Arrays.asList is used when initializing the property if it has a default value.

Author: Lars Bilger

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJavaCodegen.java

@@ -1891,6 +1891,7 @@ public void postProcessModelProperty(CodegenModel model, CodegenProperty propert
             model.imports.add("Arrays");
         } else if ("set".equals(property.containerType)) {
             model.imports.add("LinkedHashSet");
+            model.imports.add("Arrays");
             if ((!openApiNullable || !property.isNullable) && jackson) { // cannot be wrapped to nullable
                 model.imports.add("JsonDeserialize");
                 property.vendorExtensions.put("x-setter-extra-annotation", "@JsonDeserialize(as = LinkedHashSet.class)");