diff --git a/src/main/resources/handlebars/JavaVertXServer/interface.mustache b/src/main/resources/handlebars/JavaVertXServer/interface.mustache
new file mode 100644
index 0000000000..0d08bbe545
--- /dev/null
+++ b/src/main/resources/handlebars/JavaVertXServer/interface.mustache
@@ -0,0 +1,26 @@
+{{#jackson}}
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+{{/jackson}}
+/**
+* {{#description}}{{.}}{{/description}}{{^description}}{{classname}}{{/description}}
+*/
+{{#jackson}}
+@JsonTypeInfo(
+  use = JsonTypeInfo.Id.NAME,
+  include = JsonTypeInfo.As.PROPERTY,
+  property = "type")
+@JsonSubTypes({
+  {{#subTypes}}
+  @JsonSubTypes.Type(value = {{classname}}.class, name = "{{classname}}"){{^@last}},{{/@last}}
+  {{/subTypes}}
+})
+{{/jackson}}
+public interface {{{classname}}} {
+
+{{#vendorExtensions}}
+{{#x-discriminator-type-getter}}
+    {{x-discriminator-type}} {{x-discriminator-type-getter}}();
+{{/x-discriminator-type-getter}}
+{{/vendorExtensions}}
+}
diff --git a/src/test/resources/3_0_0/petstore-vertx.yaml b/src/test/resources/3_0_0/petstore-vertx.yaml
index 73ffa78fbc..9fc20545e6 100644
--- a/src/test/resources/3_0_0/petstore-vertx.yaml
+++ b/src/test/resources/3_0_0/petstore-vertx.yaml
@@ -745,8 +745,33 @@ components:
             - available
             - pending
             - sold
+        part:
+          type: array
+          items:
+            oneOf:
+              - $ref: "#/components/schemas/Dog"
+              - $ref: "#/components/schemas/Cat"
       xml:
         name: Pet
+    Dog:
+      allOf:
+        - $ref: '#/components/schemas/Pet'
+        - type: object
+          properties:
+            bark:
+              type: boolean
+            breed:
+              type: string
+              enum: [Dingo, Husky, Retriever, Shepherd]
+    Cat:
+      allOf:
+        - $ref: '#/components/schemas/Pet'
+        - type: object
+          properties:
+            hunts:
+              type: boolean
+            age:
+              type: integer
     ApiResponse:
       type: object
       properties: