added test with external-ref (inside a dependency)

modules/openapi-generator-maven-plugin/examples/multi-module/java-client/pom.xml

@@ -30,6 +30,7 @@
                 </dependencies>
                 <executions>
                     <execution>
+                        <id>default</id>
                         <goals>
                             <goal>generate</goal>
                         </goals>
@@ -48,6 +49,30 @@
                                 <dateLibrary>joda</dateLibrary>
                             </configOptions>
 
+                            <!-- override the default library to jersey2 -->
+                            <library>jersey2</library>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>external-ref</id>
+                        <goals>
+                            <goal>generate</goal>
+                        </goals>
+                        <configuration>
+                            <!-- specify the OpenAPI spec -->
+                            <inputSpec>external-ref/petstore.yaml</inputSpec>
+
+                            <!-- target to generate java client code -->
+                            <generatorName>java</generatorName>
+
+                            <!-- hint: if you want to generate java server code, e.g. based on Spring Boot,
+                                 you can use the following target: <generatorName>spring</generatorName> -->
+
+                            <!-- pass any necessary config options -->
+                            <configOptions>
+                                <dateLibrary>joda</dateLibrary>
+                            </configOptions>
+
                             <!-- override the default library to jersey2 -->
                             <library>jersey2</library>
                         </configuration>

modules/openapi-generator-maven-plugin/examples/multi-module/sample-schema/src/main/resources/external-ref/petstore.yaml

@@ -0,0 +1,105 @@
+openapi: 3.0.0
+servers:
+  - url: 'http://petstore.swagger.io/v2'
+info:
+  description: Sample file with just two endpoints and one schema (defined in an external file $ref) 
+  version: 1.0.0
+  title: OpenAPI Petstore
+paths:
+  /pet:
+    post:
+      tags:
+        - pet
+      summary: Add a new pet to the store
+      description: ''
+      operationId: addPet
+      responses:
+        '200':
+          description: successful operation
+          content:
+            application/xml:
+              schema:
+                $ref: '#/components/schemas/Pet'
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Pet'
+        '405':
+          description: Invalid input
+      security:
+        - petstore_auth:
+            - 'write:pets'
+            - 'read:pets'
+      requestBody:
+        $ref: '#/components/requestBodies/Pet'
+  '/pet/{petId}':
+    get:
+      tags:
+        - pet
+      summary: Find pet by ID
+      description: Returns a single pet
+      operationId: getPetById
+      parameters:
+        - name: petId
+          in: path
+          description: ID of pet to return
+          required: true
+          schema:
+            type: integer
+            format: int64
+      responses:
+        '200':
+          description: successful operation
+          content:
+            application/xml:
+              schema:
+                $ref: '#/components/schemas/Pet'
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Pet'
+        '400':
+          description: Invalid ID supplied
+        '404':
+          description: Pet not found
+      security:
+        - api_key: []
+    delete:
+      tags:
+        - pet
+      summary: Deletes a pet
+      description: ''
+      operationId: deletePet
+      parameters:
+        - name: api_key
+          in: header
+          required: false
+          schema:
+            type: string
+        - name: petId
+          in: path
+          description: Pet id to delete
+          required: true
+          schema:
+            type: integer
+            format: int64
+      responses:
+        '400':
+          description: Invalid pet value
+      security:
+        - petstore_auth:
+            - 'write:pets'
+            - 'read:pets'
+components:
+  requestBodies:
+    Pet:
+      content:
+        application/json:
+          schema:
+            $ref: 'schemas/Pet.yaml'
+        application/xml:
+          schema:
+            $ref: 'schemas/Pet.yaml'
+      description: Pet object that needs to be added to the store
+      required: true
+  schemas:
+    Pet:
+      $ref: 'schemas/Pet.yaml'

modules/openapi-generator-maven-plugin/examples/multi-module/sample-schema/src/main/resources/external-ref/schemas/Pet.yaml

@@ -0,0 +1,29 @@
+title: a Pet
+description: A pet for sale in the pet store
+type: object
+required:
+  - name
+  - photoUrls
+properties:
+  id:
+    type: integer
+    format: int64
+  name:
+    type: string
+    example: doggie
+  photoUrls:
+    type: array
+    xml:
+      name: photoUrl
+      wrapped: true
+    items:
+      type: string
+  status:
+    type: string
+    description: pet status in the store
+    enum:
+      - available
+      - pending
+      - sold
+xml:
+  name: Pet