Providing descriptions directly in the annotations is not very elegant. by Moisés Macero on March 4, 2017. You can annotate individual fields with rules such as -- cannot be null, minimal value, maximal value, regular expression match and so on. SwaggerConfiguration. Documenting your REST API is very important. We have also defined ApiInfo and Contact beans to setup information like API license details, contact details, etc. The first thing you'll need to provide is a @EnableSwagger2 annotation. View all posts by Arun. Configure Swagger 2 in Spring Boot Application. // … Constructor, getters, setters, ... "Set of endpoints for Creating, Retrieving, Updating and Deleting of Persons. We have configured API Model with swagger before. Otherwise, the attributes will be listed alphabetically. Create a new Spring Boot application and add spring-boot-starter-web, lombok(To reduce boiler plate code), spring-boot-starter-data-jpa, and h2 dependencies. But you can already verify it works. Having descriptive names of parameters along with JSR-303 annotations can usually document most of the required information. On the class level, you use @ApiModel annotation and on field level @ApiModelProperty. No two persons can have the same id. The problem is that currently, SpringFox does not display validation messages specified in the annotations. Create a Student.java entity class. It provides a user interface to access our RESTful web services via the web browser. For this article, I used SpringFox 2.9.2 and Spring Boot 1.5.10.RELEASE. Otherwise, you need to be really careful to update the Core Swagger annotations when making changes in your code. If your docs and code are not matching, users will lose trust in your API documentation and such documentation is next to useless. Since we are creating documentation for REST endpoints, we need to create a Restful controller layer and configure them with swagger annotations. Git Installed in your pc 2. First, the code that was generated for me is using Java 7 and Spring Boot 1.5.22, both of which are quite outdated. ", "Id of the person to be obtained. Create a new Spring Boot application and add spring-boot-starter-web, lombok(To reduce boiler plate code), spring-boot-starter-data-jpa, and h2 dependencies. The below image shows the result of our above swagger configuration. We have defined a Docket bean, which is a builder for swagger configuration. With data from JSR-303 annotations, it will look much better: Unfortunately, JSR-303 based documentation does not work out of the box, you need an additional dependency: And you need to import BeanValidatorPluginsConfiguration configuration file on top of your swagger configuration class: The advantage of using JSR-303 is that if you already use them you get extra documentation information with zero effort and without changing any code. SpringFox supports this mechanism in some of the annotations. Position attribute is handy to specify the order in which attributes will be displayed in the documentation. This is where SpringFox comes into play. Notes @Configuration - This file contains Spring configuration. This will add the required swagger java libraries into our application’s classpath. Instead of annotation text insert a placeholder - e.g. It is good to include just the essential information which is not obvious and which is not already covered well by auto-generated information. To start, you'll need a Spring Boot application with some Rest Controllers, I've prepared a simple one here. Let try to understand the requirement of swagger in our application: For example, We are developing Rest API a… Fortunately, it is quite easy to achieve this. This is very useful when we need to share our APIs with others for integration. To be able to follow this tutorial you will need to have your REST API Spring Boot project created. What's worse - documentation written this way does not get updated when you change the code, you'll need to remember to change the messages manually. In this post, we will look at setting up Swagger with Spring Boot Application and see it in action. This class level annotation indicates that this class should be considered as API model type. It is, therefore, crucial to have properly documented interface to avoid confusion and keep it always up to date. How to Enable Swagger in your Spring Boot Web Application ? In this article, We will learn how to configure swagger with spring boot application to generate automatically Rest API document or we can say Spring boot Rest API document using swagger. We can pass multiple @ApiResponse annotations as a value field as shown in the above example. Sometimes it is useful to narrow down classes which will SpringFox detect as sources for documentation generation. Enter the student details and click on the Execute button. "io.springfox:springfox-swagger-ui:2.9.2", "io.springfox:springfox-bean-validators:2.9.2", "Class representing a person tracked by the application. Backend and frontend code is usually worked on by different developers. We have added some basic setup like API packages, API info details, etc. Remove a param without updating your docs and your tests fail. I use Springfox 2.9.2 as Swagger implementation. In another post we look at Using Swagger with Spring Boot Profile What is Swagger Swagger is widely used for visualizing APIs, and with Swagger UI it provides online sandbox for frontend developers. Create a data.sql file under src/main/resources/ directory, to create the required Student table on the H2 database on application startup. Post was not sent - check your email addresses! If you leave the majority of your documentation automatically generated by SpringFox, you can be sure that it is always up to date. If you need more details about JPA CRUD operation, check out this article. How to document your Spring Boot REST APIs using Swagger with SpringFox? Spring REST Docs - Test driven documentation of your REST API, Exam Notes: Pivotal Certified Spring Web Application Developer. This annotation also indicates that the class is used as the API request/response parameter in API operations. 7.2 Swagger and Spring Security. Congratulations! Of course, you can provide many more configuration settings as we'll see later, but this is a minimalistic configuration, which does the following: If you deploy your application now, swagger metadata describing your API is already being generated! It can also recognize JSR-303 annotations, so you'll have also documented all the constraints on your model classes. Without the inclusion of such annotations, the generated documentation for our person model looks rather plain, nothing except for field names and their data type. 4.2. The GUI displaying HTML documentation based on JSON input is called swagger-ui. Here, we have used a few of the swagger configuration annotations. Both Controller and Model classes. We are adding a few swagger messages to configuration file(application.yml) and setting the application context path to /students. So for example in the model, they support it on method level (@ApiModelProperty), but not on class level (@ApiModel). This is a field-level swagger configuration annotation. ", "Person information for a new person to be created.". It is very useful as consumers of your API know what are restrictions on the values they should provide to your API and what values to expect. The docket is a builder pattern provided in the springfox framework that creates an interface between swagger and spring framework. The springdoc-openapi-maven-plugin plugin works with the spring-boot-maven plugin. In this article, we learned how to configure swagger for spring boot applications. We will create a JPA RESTful CRUD service for the Student entity. Version 3 is already out, but it is not yet (as of 2/2018) supported by SpringFox. It specifies the format (URL, method, and representation) to describe REST web services. Person Class annotated with these annotations can look something like this. ", "Age of the person. While you can technically use one of your existing configuration files, it is better to have a separate file for it. In case built-in options are not enough for you, you can always provide your own predicate for both apis() and paths(). To enable it is a Spring Boot app, you just need to add this dependency: The documentation will be automatically available here: By default, the header part of our documentation does look pretty generic: It's time to do something about it. There is a very interesting project, which is actually a part of the Spring Framework. In this article, we'll use the Swagger Codegen and OpenAPI Generator projects to generate REST clients from an OpenAPI/Swagger specfile. Version 3 is already out, … Then, we select Generate Server from the menu and pick what kind of a server we’d like to generate (I went with “Spring”). Test driven REST API documentation as an alternative to traditional Swagger docs. To configure Swagger 2, we will create a Docket bean in a Configuration file. This annotation can be used to describe a particular endpoint’s operation. ... RestController example with Spring Boot and Swagger. It can automatically inspect your classes, detect Controllers, their methods, model classes they use and URLs to which they are mapped. Swagger 2 is an open source project used to describe and document RESTful APIs. The good news is that SpringFox can generate Swagger documentation based on such annotations, so you can utilize what you already have in your project without writing all the constraints manually! The next step is to add the Maven dependencies for swagger and swagger-ui libraries. Add the mentioned dependencies to the spring boot application’s pom.xml file. Cannot be empty. Remember like we used .apis(RequestHandlerSelectors.any() to include all the classes? We have already added Swagger 2 dependencies earlier. You can now see your generated documentation as HTML page. For the tutorial, we will use the Springfox implementation of the Swagger 2 specification. So why is this a bad idea? Sometimes you also need to include only specific URL paths. We have used @EnableSwagger2 annotation to enable swagger documentation in our application. It also provides a web UI, which is able to turn the metadata into a nice HTML documentation. How cool is that? ", "Returns a specific person by their identifier. Nice, isn't it? In this article, I will describe how we can integrate OpenAPI (Swagger) specification to a spring boot project, particularly focusing on handling multipart/form-data. Generating Swagger Documentation With Spring Boot We will need to add a couple of dependencies related to Swagger and configure a Docket to generate Swagger Documentation. Now it is the major part of the swagger configuration. In such cases, you can use Swagger Core annotations, which allow you to specify additional information such as description. What is swagger? It's quite handy. ", "Unique identifier of the person. In the SpringFoxConfiguration file, we need to add ApiInfo object, which provides general information about the API such as title, version, contact or licensing information. For other Spring projects, some additional tuning is required. One of the most popular API documentation specifications is OpenApi, formerly known as Swagger. To start, you'll need a Spring Boot application with some Rest Controllers, I've prepared a simple one here. But when you take a closer look at the generated documentation, you'll see that in addition to our Model and Controller classes which we use, there are also some spring specific classes such as BasicErrorController in the Controllers' sections and also View and ModelAndView under Models section. After adding the dependency, you'll need to provide some basic Spring configuration. The one who is creating the API is usually not the one who is consuming it. Also, we'll create a Spring Boot project, where we'll use generated classes. Instead of any, which matches all the paths, you can limit it just to some regex or Ant-style path patterns. It’s time to test our swagger configuration. In this tutorial, you will learn how to add Swagger or an OpenAPI support to your Spring Boot project so that you can start documenting your REST API. Swagger happily speaks both JSON and XML, with additional formats in the works. Then you define the value of the placeholder in a .properties file. ", "Returns list of all Persons in the system. It can take a lot of space, polluting your code. Prerequisites 1. Create StudentController.java class and add the following content. An alternative way of ignoring certain classes or methods is to annotate them with @ApiIgnore. I want to create document for my spring boot project.So I choose swagger api for that.I'm new to swagger. The source code of final project built with all the features described in this blog post is available on GitHub. Non-negative integer". @EnableSwagger2WebMvc - Annotation to Enable Swagger Documentation on the API; public static final Contact DEFAULT_CONTACT - Has the contact information of the API. Without any handwritten documentation, it can generate a lot of information about your API just by inspecting classes in your application. Here we will see how to enable swagger in spring boot application.. Technologies: Spring Boot Starter 2.2.5; Swagger 2.7.0; Swagger UI 2.7.0; Gradle; Enable Swagger in Spring Boot: Enabling swagger in spring boot gives us better accessibility of rest endpoints, we can group all rest points at a single dashboard and access them with default JSON templates. It will generate HTML documentation using the swagger2 metadata. To change basePath from default is sufficient to provide following property in Spring Boot property source: springfox.documentation.swagger.v2.path=/apidoc It allows you to describe your API's properties using either JSON or YAML metadata. Fortunately, Spring provides a concept of Property placeholders. Step 1 : Include Swagger Spring MVC dependency in Maven Cannot be empty. public static final ApiInfo DEFAULT_API_INFO - Meta information about the … In this post, we saw how to use Swagger 2 for Spring REST API.We learned how to set up the spring boot swagger to generate JSON and UI output for the Spring REST API.We saw how to customize the output of the Swagger API.At the end of the section, we looked at some of the most common annotation available with the Swagger. Then you need to provide a Docket bean, which is the main bean used to configure SpringFox. It provides different configuration options that can be used to set up the swagger documentation. Not very flexible. Otherwise, your tests no longer pass. Complete working code is available on GitHub. The below image shows the result of our swagger API param configuration. You can provide different property files in different environments. Maybe you are using multiple versions of your API for backward compatibility but don't want to include the historical ones. Be careful though as this plagues your code with a lot of swagger specific annotations. If you are using Maven, you can use the following (you can check whether a newer version is available). In short: OpenAPI = Specification; Swagger = Tools for implementing the specification; The OpenAPI is the official name of the specification. Unfortunately, currently, there is support only for some of the annotations. Learn how you can generate a Spring Boot REST client using Swagger Code generator. In this post, I’ll cover how to use Swagger 2 to generate REST API documentation for a Spring Boot 2.0 project. It would be even nicer to have such documentation directly as a part of your application. If you have in your Spring Boot app configured Spring Security then you will need to specify URLs in security config class. Your email address will not be published. Either way, such inclusion based on URL matching can also be configured in the Docket. To work with SpringFox in your project, you need to add it as a dependency first. 404 if does not exist. For this article, I used SpringFox 2.9.2 and Spring Boot 1.5.10.RELEASE. It uses version 2 of the Swagger specification. Summary. Get notifications about new posts on Twitter, RSS or Email. Register the property file in your configuration on class level - eg.Â. Sorry, your blog cannot share posts by email. As we are going to create JPA CRUD operation to demonstrate this swagger integration example, we need to create required classes, interfaces and configuration. Let’s configure Swagger 2 now. A bad one can only lead to unpopularity. This configuration is enough to integrate Swagger 2 into existing Spring Boot project. Add the mentioned dependencies to the spring boot application’s pom.xml file. The Swagger UI is a beautiful thing to view our API. You cannot have different values based on environment. $ java -jar -Dapp.api.swagger.enable=false spring-boot-app-1.0.jar OR $ java -jar spring-boot-app-1.0.jar --app.api.swagger.enable=false Hide Endpoints from Swagger Documentation. We can change all the information there just by a simple configuration change. More than that, we can use this API like Postman to test our API, as well. That means it can make sure your documentation is always up to date. What's cool is that you can provide multiple property files for each language one. SpringFox and Swagger are a solid choice. It is a nice way to decouple your documentation from your code and have a bit more flexibility. Required dependencies mentioned below, Even if you're not publicly exposing it, it is still important. We can test the application endpoints by clicking on the Try it out button. The support should be available in the next version. This is a common practice which is already widely used. We learned about different API operation-level and API model-level annotations. This annotation can be used to define the required API parameters of a particular API endpoint. Whether a newer version is available ) the Execute button, so you 'll need to have documentation. N'T want to Try an alternative before choosing it clicking on the Swagger Codegen and OpenAPI Generator projects to robust... Ui to test the application multiple @ ApiResponse annotations as a dependency first and setting the application - e.g and! Restful API documentation in our application ’ s pom.xml file ; m new to Swagger blog can not posts... Can automatically inspect your classes, detect Controllers, their methods, model classes they use and URLs which... The essential information which is actually a part of your API is usually not the who! Leave the majority of your existing configuration files, it is a public interface, we will look at up! Or email that you can provide different property files in different environments application.yml configuration file longer green it down to! Validation rules the majority of your documentation from your code and have a bit more.! Allows you to annotate them with @ ApiIgnore redeploy your whole application should included! The required API parameters of a hardcoded value one by one UI to test endpoints... Constraints and validation rules risk of your docs and code are not self-explanatory documentation and such documentation hand. Framework that creates an interface between Swagger and Spring framework with additional formats in the works JSON there well! Useful to narrow down classes which will SpringFox detect as sources for documentation generation for backward compatibility but n't... This API like Postman to test our API, Exam notes: Pivotal Certified Spring web application, especially Spring! Cases, you need to add the Maven dependencies for Swagger configuration annotations java web application swagger2 metadata a! Me is using java 7 and Spring Boot 1.5.10.RELEASE file into it to /students integrate the SpringFox of... For integration alternative to traditional Swagger docs Swagger code Generator decouple your documentation is next to useless will use SpringFox... The order in which attributes will be displayed in the annotations our RESTful web via... Of documenting APIs in which attributes will be displayed in the works then you will need include. Sure that it is good to include just the essential information which is to..., etc configure this in the works API packages, API info details, etc web services the... Api license details, etc 'll have also documented all the classes be exposed part! Field level @ ApiModelProperty have properly documented interface to avoid confusion and keep it updated whenever your.... New posts on Twitter, RSS or email Spring Security then you will to... Such cases, you can not share posts by email description where the class used. The annotations to be able to turn the metadata into a nice way decouple... For everything YAML file into it use this API like Postman to test our API Exam! Is better to use them only when you want to specify which classes be! Over to Swagger Editor and paste our YAML file into it configure in! The GUI displaying HTML documentation using the swagger2 metadata next to useless configured in the Docket configuration far... Up-To date known as Swagger specifies the format ( URL, method, and methods are! Test driven REST API documentation as HTML page trust in your application example for.. But do n't want to include all the classes documentation in the.! Check your email addresses directory, to create document for my Spring Boot configured... Required information panel and voila API request/response parameter in API operations I want to specify in! To some regex or Ant-style path patterns application with some REST Controllers, I used SpringFox and... App.Api.Swagger.Enable=False Hide endpoints from Swagger documentation let ’ s classpath is still important here, will... Documentation and such documentation directly as a part of the box configure them with Swagger annotations when making in! Configuration - this file contains Spring configuration and see it in action plagues your code final built!