Circular reference cause stackoverflow error when generating example from schema

src/main/java/io/swagger/inflector/examples/ExampleBuilder.java

@@ -50,6 +50,7 @@
 import io.swagger.models.properties.StringProperty;
 import io.swagger.models.properties.UUIDProperty;
 import io.swagger.util.Json;
+import org.apache.commons.lang3.StringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -302,6 +303,10 @@ public static Example fromProperty(Property property, Map<String, Model> definit
                 output = new DecimalExample(new BigDecimal(SAMPLE_DECIMAL_PROPERTY_VALUE));
             }
         } else if (property instanceof ObjectProperty) {
+            if(processedModels.contains(property.getName())) {
+                // return some sort of example
+                return alreadyProcessedRefExample(property.getName(), definitions);
+            }
             if (example != null) {
                 try {
                     output = Json.mapper().readValue(Json.mapper().writeValueAsString(example), ObjectExample.class);
@@ -508,6 +513,8 @@ else if(model instanceof ModelImpl) {
             if(impl.getProperties() != null) {
                 for(String key : impl.getProperties().keySet()) {
                     Property property = impl.getProperties().get(key);
+                    if(property instanceof ObjectProperty)
+                        property.setName(StringUtils.capitalize(key));
                     Example propExample = fromProperty(property, definitions, processedModels);
                     ex.put(key, propExample);
                 }

src/main/java/io/swagger/inflector/utils/ResolverUtil.java

@@ -35,6 +35,9 @@ public class ResolverUtil {
     private Map<String, Model> resolvedModels = new HashMap<>();
     private Map<String, Property> resolvedProperties = new HashMap<>();
 
+    public Map<String, Model> getResolvedModels() {
+        return resolvedModels;
+    }
 
     public void resolveFully(Swagger swagger) {
         if (swagger.getDefinitions() != null) {

src/test/java/io/swagger/test/examples/ExampleBuilderTest.java

@@ -28,6 +28,7 @@
 import io.swagger.inflector.examples.models.StringExample;
 import io.swagger.inflector.processors.JsonExampleDeserializer;
 import io.swagger.inflector.processors.JsonNodeExampleSerializer;
+import io.swagger.inflector.utils.ResolverUtil;
 import io.swagger.models.Model;
 import io.swagger.models.ModelImpl;
 import io.swagger.models.Response;
@@ -633,6 +634,24 @@ public void testAllOfAndRef() throws Exception {
                 "}");
     }
 
+    @Test
+    public void testCircularRefSchema() throws Exception {
+        Swagger swagger = new SwaggerParser().read("./src/test/swagger/circuler-refs-SPLAT-56.yaml");
+        ResolverUtil resolverUtil = new ResolverUtil();
+        resolverUtil.resolveFully(swagger);
+        Example example = ExampleBuilder.fromProperty(new RefProperty("Source"), resolverUtil.getResolvedModels());
+        assertEqualsIgnoreLineEnding(Json.pretty(example), "{\n" +
+                "  \"id\" : 0,\n" +
+                "  \"name\" : \"CDR\",\n" +
+                "  \"candidates\" : {\n" +
+                "    \"id\" : 0,\n" +
+                "    \"firstName\" : \"Jean\",\n" +
+                "    \"lastName\" : \"Dupont\",\n" +
+                "    \"source\" : { }\n" +
+                "  }\n" +
+                "}");
+    }
+
     private String getExampleForPath(Swagger swagger, String s) {
         Response response = swagger.getPath(s).getGet().getResponses().get("200");
         Example example = ExampleBuilder.fromProperty(response.getSchema(), swagger.getDefinitions());

src/test/swagger/circuler-refs-SPLAT-56.yaml

@@ -0,0 +1,95 @@
+swagger: '2.0'
+tags:
+- name: candidate
+# - http
+paths:
+  /candidates:
+    post:
+      tags:
+      - candidate
+      summary: Add a new candidate to the database
+      operationId: addCandidate
+      consumes:
+      - application/json
+      produces:
+      - application/json
+      parameters:
+      - in: body
+        name: body
+        description: Candiadate object that needs to be added to the database
+        required: true
+        schema:
+          $ref: '#/definitions/Candidate'
+      responses:
+        405:
+          description: Invalid input
+      security:
+      - petstore_auth:
+        - write:pets
+        - read:pet
+  /sources:
+    post:
+      tags:
+      - source
+      summary: Add a new source to the database
+      operationId: addSource
+      consumes:
+      - application/json
+      produces:
+      - application/json
+      parameters:
+      - in: body
+        name: body
+        description: Source object that needs to be added to the database
+        required: true
+        schema:
+          $ref: '#/definitions/Source'
+      responses:
+        405:
+          description: Invalid input
+      security:
+      - petstore_auth:
+        - write:pets
+        - read:pets
+definitions:
+  Candidate:
+    type: object
+    required:
+    - firstName
+    - lastName
+    properties:
+      id:
+        type: integer
+        format: int64
+      firstName:
+        type: string
+        example: Jean
+      lastName:
+        type: string
+        example: Dupont
+      source:
+        $ref: '#/definitions/Source'
+  Source:
+    type: object
+    required:
+    - name
+    properties:
+      id:
+        type: integer
+        format: int64
+      name:
+        type: string
+        example: CDR
+      candidates:
+        $ref: '#/definitions/Candidate'
+externalDocs:
+  description: Find out more about Swagger
+  url: http://swagger.io
+# Added by API Auto Mocking Plugin
+# host: miami.swaggerhub.com
+basePath: /mia87/MiamiAPI/1.0.1
+schemes:
+ - https
+ - http
+# Added by API Auto Mocking Plugin
+host: virtserver.swaggerhub.com