diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJuliaCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJuliaCodegen.java
index 728b5160d767..6fec46385629 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJuliaCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractJuliaCodegen.java
@@ -422,7 +422,7 @@ public abstract class AbstractJuliaCodegen extends DefaultCodegen {
             } else if (ModelUtils.isIntegerSchema(schema) || ModelUtils.isLongSchema(schema) || ModelUtils.isNumberSchema(schema)) {
                 return schema.getDefault().toString();
             } else if (ModelUtils.isStringSchema(schema)) {
-                String _default = (String) schema.getDefault();
+                String _default = String.valueOf(schema.getDefault());
                 return "\"" + _default + "\"";
             }
         }
diff --git a/modules/openapi-generator/src/test/resources/3_0/julia/petstore.yaml b/modules/openapi-generator/src/test/resources/3_0/julia/petstore.yaml
index 0c94c44ac167..826074f7a374 100644
--- a/modules/openapi-generator/src/test/resources/3_0/julia/petstore.yaml
+++ b/modules/openapi-generator/src/test/resources/3_0/julia/petstore.yaml
@@ -569,6 +569,26 @@ paths:
           description: User not found
       security:
         - api_key: []
+  /fake/uuid_default_value_test:
+    get:
+      tags:
+        - fake
+      summary: test uuid default value
+      description: test uuid default value
+      operationId: uuid_default_value
+      parameters:
+        - name: uuid_parameter
+          in: header
+          description: test uuid default value
+          required: true
+          schema:
+            type: string
+            format: uuid
+      responses:
+        '400':
+          description: Invalid username supplied
+        '404':
+          description: User not found
 externalDocs:
   description: Find out more about Swagger
   url: 'http://swagger.io'
@@ -746,3 +766,7 @@ components:
         another_property:
           type: integer
           format: int32
+        uuid_default_value:
+          type: string
+          format: uuid
+          default: 1111-2222-3333-4444
diff --git a/samples/client/petstore/julia/.openapi-generator/FILES b/samples/client/petstore/julia/.openapi-generator/FILES
index 678cb05e38de..0fd28f028701 100644
--- a/samples/client/petstore/julia/.openapi-generator/FILES
+++ b/samples/client/petstore/julia/.openapi-generator/FILES
@@ -1,6 +1,7 @@
 README.md
 docs/ApiResponse.md
 docs/Category.md
+docs/FakeApi.md
 docs/MappedModel.md
 docs/Order.md
 docs/Pet.md
@@ -10,6 +11,7 @@ docs/Tag.md
 docs/User.md
 docs/UserApi.md
 src/OpenAPIGenPetStoreClient.jl
+src/apis/api_FakeApi.jl
 src/apis/api_PetApi.jl
 src/apis/api_StoreApi.jl
 src/apis/api_UserApi.jl
diff --git a/samples/client/petstore/julia/README.md b/samples/client/petstore/julia/README.md
index 741d292ef0cf..5cd5be5bbf72 100644
--- a/samples/client/petstore/julia/README.md
+++ b/samples/client/petstore/julia/README.md
@@ -20,6 +20,7 @@ Documentation is also embedded in Julia which can be used with a Julia specific
 
 Class | Method
 ------------ | -------------
+*FakeApi* | [**uuid_default_value**](docs/FakeApi.md#uuid_default_value)<br/>**GET** /fake/uuid_default_value_test<br/>test uuid default value
 *PetApi* | [**add_pet**](docs/PetApi.md#add_pet)<br/>**POST** /pet<br/>Add a new pet to the store
 *PetApi* | [**delete_pet**](docs/PetApi.md#delete_pet)<br/>**DELETE** /pet/{petId}<br/>Deletes a pet
 *PetApi* | [**find_pets_by_status**](docs/PetApi.md#find_pets_by_status)<br/>**GET** /pet/findByStatus<br/>Finds Pets by status
diff --git a/samples/client/petstore/julia/docs/FakeApi.md b/samples/client/petstore/julia/docs/FakeApi.md
new file mode 100644
index 000000000000..fbba161f3aaa
--- /dev/null
+++ b/samples/client/petstore/julia/docs/FakeApi.md
@@ -0,0 +1,39 @@
+# FakeApi
+
+All URIs are relative to *http://petstore.swagger.io/v2*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**uuid_default_value**](FakeApi.md#uuid_default_value) | **GET** /fake/uuid_default_value_test | test uuid default value
+
+
+# **uuid_default_value**
+> uuid_default_value(_api::FakeApi, uuid_parameter::String; _mediaType=nothing) -> Nothing, OpenAPI.Clients.ApiResponse <br/>
+> uuid_default_value(_api::FakeApi, response_stream::Channel, uuid_parameter::String; _mediaType=nothing) -> Channel{ Nothing }, OpenAPI.Clients.ApiResponse
+
+test uuid default value
+
+test uuid default value
+
+### Required Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **_api** | **FakeApi** | API context | 
+**uuid_parameter** | **String**| test uuid default value | [default to nothing]
+
+### Return type
+
+Nothing
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: Not defined
+ - **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#api-endpoints) [[Back to Model list]](../README.md#models) [[Back to README]](../README.md)
+
diff --git a/samples/client/petstore/julia/docs/MappedModel.md b/samples/client/petstore/julia/docs/MappedModel.md
index 3d9632d852d8..4d3ff25fecc1 100644
--- a/samples/client/petstore/julia/docs/MappedModel.md
+++ b/samples/client/petstore/julia/docs/MappedModel.md
@@ -5,6 +5,7 @@
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **mappedProperty** | **Int64** |  | [optional] [default to nothing]
+**uuid_default_value** | **String** |  | [optional] [default to nothing]
 
 
 [[Back to Model list]](../README.md#models) [[Back to API list]](../README.md#api-endpoints) [[Back to README]](../README.md)
diff --git a/samples/client/petstore/julia/src/OpenAPIGenPetStoreClient.jl b/samples/client/petstore/julia/src/OpenAPIGenPetStoreClient.jl
index 23c04145c824..9f15c32588da 100644
--- a/samples/client/petstore/julia/src/OpenAPIGenPetStoreClient.jl
+++ b/samples/client/petstore/julia/src/OpenAPIGenPetStoreClient.jl
@@ -11,6 +11,7 @@ const API_VERSION = "1.0.0"
 
 include("modelincludes.jl")
 
+include("apis/api_FakeApi.jl")
 include("apis/api_PetApi.jl")
 include("apis/api_StoreApi.jl")
 include("apis/api_UserApi.jl")
@@ -25,6 +26,7 @@ export Tag
 export User
 
 # export operations
+export FakeApi
 export PetApi
 export StoreApi
 export UserApi
diff --git a/samples/client/petstore/julia/src/apis/api_FakeApi.jl b/samples/client/petstore/julia/src/apis/api_FakeApi.jl
new file mode 100644
index 000000000000..11eff8e716c2
--- /dev/null
+++ b/samples/client/petstore/julia/src/apis/api_FakeApi.jl
@@ -0,0 +1,46 @@
+# This file was generated by the Julia OpenAPI Code Generator
+# Do not modify this file directly. Modify the OpenAPI specification instead.
+
+struct FakeApi <: OpenAPI.APIClientImpl
+    client::OpenAPI.Clients.Client
+end
+
+"""
+The default API base path for APIs in `FakeApi`.
+This can be used to construct the `OpenAPI.Clients.Client` instance.
+"""
+basepath(::Type{ FakeApi }) = "http://petstore.swagger.io/v2"
+
+const _returntypes_uuid_default_value_FakeApi = Dict{Regex,Type}(
+    Regex("^" * replace("400", "x"=>".") * "\$") => Nothing,
+    Regex("^" * replace("404", "x"=>".") * "\$") => Nothing,
+)
+
+function _oacinternal_uuid_default_value(_api::FakeApi, uuid_parameter::String; _mediaType=nothing)
+    _ctx = OpenAPI.Clients.Ctx(_api.client, "GET", _returntypes_uuid_default_value_FakeApi, "/fake/uuid_default_value_test", [])
+    OpenAPI.Clients.set_param(_ctx.header, "uuid_parameter", uuid_parameter)  # type String
+    OpenAPI.Clients.set_header_accept(_ctx, [])
+    OpenAPI.Clients.set_header_content_type(_ctx, (_mediaType === nothing) ? [] : [_mediaType])
+    return _ctx
+end
+
+@doc raw"""test uuid default value
+
+test uuid default value
+
+Params:
+- uuid_parameter::String (required)
+
+Return: Nothing, OpenAPI.Clients.ApiResponse
+"""
+function uuid_default_value(_api::FakeApi, uuid_parameter::String; _mediaType=nothing)
+    _ctx = _oacinternal_uuid_default_value(_api, uuid_parameter; _mediaType=_mediaType)
+    return OpenAPI.Clients.exec(_ctx)
+end
+
+function uuid_default_value(_api::FakeApi, response_stream::Channel, uuid_parameter::String; _mediaType=nothing)
+    _ctx = _oacinternal_uuid_default_value(_api, uuid_parameter; _mediaType=_mediaType)
+    return OpenAPI.Clients.exec(_ctx, response_stream)
+end
+
+export uuid_default_value
diff --git a/samples/client/petstore/julia/src/models/model_MappedModel.jl b/samples/client/petstore/julia/src/models/model_MappedModel.jl
index a720b1425893..94bf2fe52a1b 100644
--- a/samples/client/petstore/julia/src/models/model_MappedModel.jl
+++ b/samples/client/petstore/julia/src/models/model_MappedModel.jl
@@ -7,20 +7,24 @@ to test mapping features
 
     MappedModel(;
         mappedProperty=nothing,
+        uuid_default_value=nothing,
     )
 
     - mappedProperty::Int64
+    - uuid_default_value::String
 """
 Base.@kwdef mutable struct MappedModel <: OpenAPI.APIModel
     mappedProperty::Union{Nothing, Int64} = nothing
+    uuid_default_value::Union{Nothing, String} = nothing
 
-    function MappedModel(mappedProperty, )
+    function MappedModel(mappedProperty, uuid_default_value, )
         OpenAPI.validate_property(MappedModel, Symbol("another_property"), mappedProperty)
-        return new(mappedProperty, )
+        OpenAPI.validate_property(MappedModel, Symbol("uuid_default_value"), uuid_default_value)
+        return new(mappedProperty, uuid_default_value, )
     end
 end # type MappedModel
 
-const _property_types_MappedModel = Dict{Symbol,String}(Symbol("another_property")=>"Int64", )
+const _property_types_MappedModel = Dict{Symbol,String}(Symbol("another_property")=>"Int64", Symbol("uuid_default_value")=>"String", )
 OpenAPI.property_type(::Type{ MappedModel }, name::Symbol) = Union{Nothing,eval(Base.Meta.parse(_property_types_MappedModel[name]))}
 
 function check_required(o::MappedModel)
@@ -31,4 +35,7 @@ function OpenAPI.validate_property(::Type{ MappedModel }, name::Symbol, val)
     if name === Symbol("another_property")
         OpenAPI.validate_param(name, "MappedModel", :format, val, "int32")
     end
+    if name === Symbol("uuid_default_value")
+        OpenAPI.validate_param(name, "MappedModel", :format, val, "uuid")
+    end
 end
diff --git a/samples/server/petstore/julia/.openapi-generator/FILES b/samples/server/petstore/julia/.openapi-generator/FILES
index 4d1221f98b9a..c712606f5235 100644
--- a/samples/server/petstore/julia/.openapi-generator/FILES
+++ b/samples/server/petstore/julia/.openapi-generator/FILES
@@ -2,6 +2,7 @@ README.md
 docs/AnotherModel.md
 docs/ApiResponse.md
 docs/Category.md
+docs/FakeApi.md
 docs/Order.md
 docs/Pet.md
 docs/PetApi.md
@@ -10,6 +11,7 @@ docs/Tag.md
 docs/User.md
 docs/UserApi.md
 src/OpenAPIGenPetStoreServer.jl
+src/apis/api_FakeApi.jl
 src/apis/api_PetApi.jl
 src/apis/api_StoreApi.jl
 src/apis/api_UserApi.jl
diff --git a/samples/server/petstore/julia/README.md b/samples/server/petstore/julia/README.md
index 453d687742fe..79b0a50917dc 100644
--- a/samples/server/petstore/julia/README.md
+++ b/samples/server/petstore/julia/README.md
@@ -41,6 +41,7 @@ The following server methods must be implemented:
 
 Class | Method | HTTP request | Description
 ------------ | ------------- | ------------- | -------------
+*FakeApi* | [**uuid_default_value**](docs/FakeApi.md#uuid_default_value) | **GET** /fake/uuid_default_value_test | test uuid default value
 *PetApi* | [**add_pet**](docs/PetApi.md#add_pet) | **POST** /pet | Add a new pet to the store
 *PetApi* | [**delete_pet**](docs/PetApi.md#delete_pet) | **DELETE** /pet/{petId} | Deletes a pet
 *PetApi* | [**find_pets_by_status**](docs/PetApi.md#find_pets_by_status) | **GET** /pet/findByStatus | Finds Pets by status
diff --git a/samples/server/petstore/julia/docs/AnotherModel.md b/samples/server/petstore/julia/docs/AnotherModel.md
index 97cd056157f5..3fc35e1b3606 100644
--- a/samples/server/petstore/julia/docs/AnotherModel.md
+++ b/samples/server/petstore/julia/docs/AnotherModel.md
@@ -5,6 +5,7 @@
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
 **another_property** | **Int64** |  | [optional] [default to nothing]
+**uuid_default_value** | **String** |  | [optional] [default to nothing]
 
 
 [[Back to Model list]](../README.md#models) [[Back to API list]](../README.md#api-endpoints) [[Back to README]](../README.md)
diff --git a/samples/server/petstore/julia/docs/FakeApi.md b/samples/server/petstore/julia/docs/FakeApi.md
new file mode 100644
index 000000000000..4a605399a3dc
--- /dev/null
+++ b/samples/server/petstore/julia/docs/FakeApi.md
@@ -0,0 +1,38 @@
+# FakeApi
+
+All URIs are relative to *http://petstore.swagger.io/v2*
+
+Method | HTTP request | Description
+------------- | ------------- | -------------
+[**uuid_default_value**](FakeApi.md#uuid_default_value) | **GET** /fake/uuid_default_value_test | test uuid default value
+
+
+# **uuid_default_value**
+> uuid_default_value(req::HTTP.Request, uuid_parameter::String;) -> Nothing
+
+test uuid default value
+
+test uuid default value
+
+### Required Parameters
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **req** | **HTTP.Request** | The HTTP Request object | 
+**uuid_parameter** | **String**| test uuid default value | [default to nothing]
+
+### Return type
+
+Nothing
+
+### Authorization
+
+No authorization required
+
+### HTTP request headers
+
+ - **Content-Type**: Not defined
+ - **Accept**: Not defined
+
+[[Back to top]](#) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to Model list]](../README.md#documentation-for-models) [[Back to README]](../README.md)
+
diff --git a/samples/server/petstore/julia/src/OpenAPIGenPetStoreServer.jl b/samples/server/petstore/julia/src/OpenAPIGenPetStoreServer.jl
index e399bf6bdfca..ecf97ffead3b 100644
--- a/samples/server/petstore/julia/src/OpenAPIGenPetStoreServer.jl
+++ b/samples/server/petstore/julia/src/OpenAPIGenPetStoreServer.jl
@@ -7,6 +7,9 @@ Encapsulates generated server code for OpenAPIGenPetStoreServer
 
 The following server methods must be implemented:
 
+- **uuid_default_value**
+    - *invocation:* GET /fake/uuid_default_value_test
+    - *signature:* uuid_default_value(req::HTTP.Request, uuid_parameter::String;) -> Nothing
 - **add_pet**
     - *invocation:* POST /pet
     - *signature:* add_pet(req::HTTP.Request, pet::Pet;) -> Pet
@@ -81,6 +84,7 @@ const API_VERSION = "1.0.0"
 
 include("modelincludes.jl")
 
+include("apis/api_FakeApi.jl")
 include("apis/api_PetApi.jl")
 include("apis/api_StoreApi.jl")
 include("apis/api_UserApi.jl")
@@ -106,6 +110,7 @@ The order in which middlewares are invoked are:
 `init |> read |> pre_validation |> validate |> pre_invoke |> invoke |> post_invoke`
 """
 function register(router::HTTP.Router, impl; path_prefix::String="", optional_middlewares...)
+    registerFakeApi(router, impl; path_prefix=path_prefix, optional_middlewares...)
     registerPetApi(router, impl; path_prefix=path_prefix, optional_middlewares...)
     registerStoreApi(router, impl; path_prefix=path_prefix, optional_middlewares...)
     registerUserApi(router, impl; path_prefix=path_prefix, optional_middlewares...)
diff --git a/samples/server/petstore/julia/src/apis/api_FakeApi.jl b/samples/server/petstore/julia/src/apis/api_FakeApi.jl
new file mode 100644
index 000000000000..d4bce31b9490
--- /dev/null
+++ b/samples/server/petstore/julia/src/apis/api_FakeApi.jl
@@ -0,0 +1,37 @@
+# This file was generated by the Julia OpenAPI Code Generator
+# Do not modify this file directly. Modify the OpenAPI specification instead.
+
+
+function uuid_default_value_read(handler)
+    function uuid_default_value_read_handler(req::HTTP.Request)
+        openapi_params = Dict{String,Any}()
+        headers = Dict{String,String}(HTTP.headers(req))
+        openapi_params["uuid_parameter"] = OpenAPI.Servers.to_param(String, headers, "uuid_parameter", required=true, )
+        req.context[:openapi_params] = openapi_params
+
+        return handler(req)
+    end
+end
+
+function uuid_default_value_validate(handler)
+    function uuid_default_value_validate_handler(req::HTTP.Request)
+        openapi_params = req.context[:openapi_params]
+        
+        return handler(req)
+    end
+end
+
+function uuid_default_value_invoke(impl; post_invoke=nothing)
+    function uuid_default_value_invoke_handler(req::HTTP.Request)
+        openapi_params = req.context[:openapi_params]
+        ret = impl.uuid_default_value(req::HTTP.Request, openapi_params["uuid_parameter"];)
+        resp = OpenAPI.Servers.server_response(ret)
+        return (post_invoke === nothing) ? resp : post_invoke(req, resp)
+    end
+end
+
+
+function registerFakeApi(router::HTTP.Router, impl; path_prefix::String="", optional_middlewares...)
+    HTTP.register!(router, "GET", path_prefix * "/fake/uuid_default_value_test", OpenAPI.Servers.middleware(impl, uuid_default_value_read, uuid_default_value_validate, uuid_default_value_invoke; optional_middlewares...))
+    return router
+end
diff --git a/samples/server/petstore/julia/src/models/model_AnotherModel.jl b/samples/server/petstore/julia/src/models/model_AnotherModel.jl
index 7e9980bd8946..e5235e2e4be0 100644
--- a/samples/server/petstore/julia/src/models/model_AnotherModel.jl
+++ b/samples/server/petstore/julia/src/models/model_AnotherModel.jl
@@ -7,20 +7,24 @@ to test mapping features
 
     AnotherModel(;
         another_property=nothing,
+        uuid_default_value=nothing,
     )
 
     - another_property::Int64
+    - uuid_default_value::String
 """
 Base.@kwdef mutable struct AnotherModel <: OpenAPI.APIModel
     another_property::Union{Nothing, Int64} = nothing
+    uuid_default_value::Union{Nothing, String} = nothing
 
-    function AnotherModel(another_property, )
+    function AnotherModel(another_property, uuid_default_value, )
         OpenAPI.validate_property(AnotherModel, Symbol("another_property"), another_property)
-        return new(another_property, )
+        OpenAPI.validate_property(AnotherModel, Symbol("uuid_default_value"), uuid_default_value)
+        return new(another_property, uuid_default_value, )
     end
 end # type AnotherModel
 
-const _property_types_AnotherModel = Dict{Symbol,String}(Symbol("another_property")=>"Int64", )
+const _property_types_AnotherModel = Dict{Symbol,String}(Symbol("another_property")=>"Int64", Symbol("uuid_default_value")=>"String", )
 OpenAPI.property_type(::Type{ AnotherModel }, name::Symbol) = Union{Nothing,eval(Base.Meta.parse(_property_types_AnotherModel[name]))}
 
 function check_required(o::AnotherModel)
@@ -31,4 +35,7 @@ function OpenAPI.validate_property(::Type{ AnotherModel }, name::Symbol, val)
     if name === Symbol("another_property")
         OpenAPI.validate_param(name, "AnotherModel", :format, val, "int32")
     end
+    if name === Symbol("uuid_default_value")
+        OpenAPI.validate_param(name, "AnotherModel", :format, val, "uuid")
+    end
 end