Avoid overflow when storing an int64 in an Integer

modules/swagger-parser-v3/src/main/java/io/swagger/v3/parser/util/OpenAPIDeserializer.java

@@ -1193,7 +1193,9 @@ public Integer getInteger(String key, ObjectNode node, boolean required, String
             }
         }
         else if(v.getNodeType().equals(JsonNodeType.NUMBER)) {
-            value = v.intValue();
+            if (v.isInt()) {
+                value = v.intValue();
+            }
         }
         else if(!v.isValueNode()) {
             result.invalidType(location, key, "integer", node);

modules/swagger-parser-v3/src/test/java/io/swagger/v3/parser/test/OpenAPIV3ParserTest.java

@@ -7,6 +7,7 @@
 import io.swagger.v3.core.util.Yaml;
 import io.swagger.v3.oas.models.Components;
 import io.swagger.v3.oas.models.OpenAPI;
+import io.swagger.v3.oas.models.media.IntegerSchema;
 import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.responses.ApiResponse;
 import io.swagger.v3.parser.OpenAPIV3Parser;
@@ -352,6 +353,13 @@ public void testOneOfExternalRefConflictName() throws Exception {
         Assert.assertTrue(pet.getDiscriminator().getMapping().get("Cat").equals("#/components/schemas/Cat_2"));
     }
 
+    @Test
+    public void int64ExampleWithoutOverflow() throws Exception {
+        OpenAPI openAPI = new OpenAPIV3Parser().read("src/test/resources/int64example.yaml");
+        IntegerSchema date = ((IntegerSchema) openAPI.getPaths().get("/foo").getGet().getResponses().get("200").getContent().get("application/json").getSchema().getProperties().get("date"));
+        Assert.assertEquals("1516042231144", date.getExample().toString());
+    }
+
 
     private static int getDynamicPort() {
         return new Random().ints(10000, 20000).findFirst().getAsInt();

modules/swagger-parser-v3/src/test/resources/int64example.yaml

@@ -0,0 +1,21 @@
+openapi: 3.0.0
+info:
+  version: 0.0.0
+  title: int64 mocking test
+paths:
+  /foo:
+    get:
+      responses:
+        '200':
+          description: OK
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  date:
+                    type: integer
+                    format: int64
+                    example: 1516042231144
+                required:
+                  - date