- Phát triển một dự án REAL-TIME với Spring MVC và Hibernate CRUD tất cả từ đầu. @Data is a Lombok annotation to create all the getters, setters, equals, hash, and toString methods, based on the fields. This course covers the LATEST VERSIONS of Spring 5 and Hibernate 5! The course also includes Spring Boot and Spring Data JPA. The full source code for the examples is available in the GitHub project. The entity object is simply a POJO class which has a @Entity annotation. jar) and a separate peer example web application (a. How to build a REST service using Spring MVC to return json without using view resolver?. It’s a framework that’s constantly evolving, so more options arise in new versions at the same time that old ones are kept for the sake of backward compatibility. RestTemplate provides an abstraction for making RESTful HTTP requests, and internally, RestTemplate utilizes a native Android HTTP client library for those requests. Create a JSON object from code Now, we want to create the JSON object from code. The Gson is an open source library to deal with JSON in Java programs. To make this POJO available as a Spring service bean, we just add the @Service annotation. Note: Refer How to convert Java object to JSON string? page for dependent libraries. I am trying to post a request to my service, but it's not working. Convert Java object to JSON 3. RESTful example with Tomcat and maven. Setting up a Spring REST project with Maven. Spring Boot REST Tutorial. Convert Object to Map. It also has basic support for retrieving images. The HTTPBuilder class provides an API to make HTTP requests and parse the responses, and builds upon the Apache AbstractHttpClient class. Gson is google API that effectively coverts JSON into corresponding java object and java object into JSON string. The first test uses the getForEntity method of the template, which returns a ResponseEntity. JSONizer is an Eclipse plugin tool which provides a convenient and quick means for converting a Java (POJO) file to a JSON file and, vice versa, directly from the Eclipse IDE. Java Code Examples for javax. @Entity is a JPA annotation to make this object ready for storage in a JPA-based data store. The return type " ResponseEntity " of the method says that it will return an Object of ResponseEntity. In this article, we will be going to discuss how to integrate Elastic Search with spring boot. It is developed by Pivotal Team and is used to build stand-alone and production ready spring applications. The tool will convert json to java pojo classes, generate java pojo classes from json quickly. So let's split our route into two routes to reflect this:. 4 in blog part-1 1. You can run the example application in the example directory:. xml will be stored under WEB-INF folder also you need to add the dependency in POM. This document is one alternative. jar) and a separate peer example web application (a. Below code demonstrates that. Learn Basic and advanced configurations, reducing development time by many-fold. Gson provides options to print JSON in well-defined way. Sir animal, thank you for the help, but from how i understand, convert function converts value which are already provided by the reader and to be stored in the record. We will see how to create Gson object and how API can be used to convert between java object and JSON. Converting JSON data to Java POJO with Jackson. Complete Spring Boot Rest API tutorial with all CRUD operations. Introduction. the problem is I don't think the json with "@" sign is read by the json reader when the field is in the 2nd layer, like the nickname for example. It also has basic support for retrieving images. Jersey will use Jackson to convert Java objects to / form JSON, but just don’t ask me what is Jackson 🙂 ,as of now just remember its a high performance JSON processor, Jersey will use this API to the marshaling [converting the objects] process. GSON is a very popular Java library for work with JSON. Java 8 + Java EE 7: POJO to JsonObject Conversion. Try changing this line: ResponseEntity responseEntity = restTemplate. In this tutorial we'll create a Spring MVC REST client that uses Spring 3's RestTemplate. Jersey Client Example with JSON Support 05 Apr 2014. You can convert JSON String to Java object in just 2 lines by using Gson as shown below. For most programmers, form handling is the day-to-day task in general web development as well as in Spring MVC development. HttpMessageNotWritableException. The tools and technologies that I have used are;. It’s a framework that’s constantly evolving, so more options arise in new versions at the same time that old ones are kept for the sake of backward compatibility. In this blog post I’m going to show how you can return JSONP so that you can call your REST APIs directly from your Javascript functions. Our client is able to communicate via XML and JSON. In our example I will provide a complete demo how to use Gson. String str = g. T his article describes how to get a JSON response from the RESTful web services using jersey implementation. Build a complete Spring MVC + Hibernate CRUD web app … all from scratch!. Spring provides out-of-box many default HttpMessageConverters, which will be used for conversion, depending on presence of certain library in project classpath. Find a solution to your bug with our map. DTO, which stands for Data Transfer Object, is a design pattern conceived to reduce the number of calls when working with remote interfaces. Spring Boot REST Tutorial. HttpMessageNotWritableException. Complete Spring Boot Rest API tutorial with all CRUD operations. Then we need to include the Spring-servlet. - Phát triển một dự án REAL-TIME với Spring MVC và Hibernate CRUD tất cả từ đầu. This document is one alternative. 5 レスポンスでPoJoからJson文字列返却(URLの拡張子を無視させる方法(URLが*. HelloBeer TM recently got some complaints from the Alcoholics Anonymous community. exchange(url, HttpMethod. HelloBeer TM recently got some complaints from the Alcoholics Anonymous community. This post will cover the building and parsing of JSON, converting JSON to and from POJOs, adding authentication headers and handling response success and failures. JsonObject and javax. Creating the Spring REST Controller using @RestController. T his article describes how to get a JSON response from the RESTful web services using jersey implementation. This nifty plugin supports two types of conversion: • Java (source/POJO) to JSON, and • JSON to Java. Convert XML or JSON to Java Pojo Classes - Online Convert XSD to Java Pojo Classes Convert Text to String variable Generate Java DAO for Data Table Generate CRUD. Integration with spray-json Jackson is provided out of the box through the akka-http-spray-json akka-http-jackson module. To do this we will convert the Response in lower case and then compare it with our lower case string value. (202 = ACCEPTED). As well as being key value store, Redis offers a publish subscribe messaging implementation. Writing Java POJOs out as simple JSON is a good general mechanism for serializing Java Objects, to be transferred over network: sent as input for REST services, returned as output, and sometimes…. Hi Chaitanya, I would require a clarification from you with respect to the override annotation. Spring provides support for JSON content-type to backing object conversion by using MappingJackson2HttpMessageConverter. I am using Jersey's POJO mapping feature to map JSON responses to Java objects. Posts about howto written by Roger Goossens. There are many examples on the net. toJson(p);. 1 A Jackson 2 example to convert a Student object into a java. In this article, we will be going to discuss how to integrate Elastic Search with spring boot. fromJson(jsonString, Player. We have to include only jackson dependencies into classpath of the application and spring will register Jackson2JsonMessageConverter class automatically into context. Spring provides out-of-box many default HttpMessageConverters, which will be used for conversion, depending on presence of certain library in project classpath. You cannot pass a POJO to another VM or another server or another process not implemented in Java. I've seen projects with thousands of POJO classes that all existed just so Hibernate could create them, and the only thing they were used for was to generate JSON. - Phát triển một dự án REAL-TIME với Spring MVC và Hibernate CRUD tất cả từ đầu. In our example I will provide a complete demo how to use Gson. Table of Contents 1. The actual response is inside the body. Spring Framework 5: Tìm hiểu về Spring Core, Spring AOP, Spring MVC, Spring Security, Spring REST, Spring Boot và Hibernate. In this tutorial, we will show you how to use Gson to convert Java object to / from JSON. fromJson(,). Spring also document this class, but again, it’s very brief. And thats how is came to know the various format of the response. I am trying to post a request to my service, but it's not working. The full source code for the examples is available in the GitHub project. With Java 8 a java. REST – Spring Boot May 30, 2017 June 30, 2017 T Tak Java Since its inception in 2002, the Spring framework saw a tremendous growth in terms of functionalities which ultimately made the framework a bit complex. Like XML, JSON provides a way of representing object that is both human readable and machine processable. As well as being key value store, Redis offers a publish subscribe messaging implementation. This works, but I would like to have more control. Build a complete Spring MVC + Hibernate CRUD web app … all from scratch!. Adding the dependency in POM. The RestTemplate is the central class within the Spring framework for executing synchronous HTTP requests on the client side. Any reactive or POJO return type. Gson g = new Gson(); Player p = g. The example shows you how to create a bucket, list it's content, create a folder into a bucket, upload a file, give the file a public access and finally how to delete all this items. xml will be stored under WEB-INF folder also you need to add the dependency in POM. I have GET requests that are working perfectly in the same controller. The ResponseEntity returns a String "Hello firstName secondName" and http status code 202, which is provided in the parameter of the ResponseEntity. Spring REST JSON – @ResponseBody Annotation. One to check if the XML consumed from the ftp endpoint is being properly unmarshalled to an Order POJO; One to check the quality of the subsequent marshalling of said POJO to JSON and also to check if it's being sent to our REST controller. The element is used to set the relationship between Certificate and Employee classes. Build a complete Spring MVC + Hibernate CRUD web app … all from scratch! (real-time project) You will learn about: Spring Core, AOP, Spring MVC, Spring Security, Spring REST, Spring Boot, Spring Data JPA, Spring Data REST, Thymeleaf and Hibernate … all connected to a MySQL database. How do I get raw JSON? Instead of returning your POJO it you need to return ONLY the response object, and then consume it yourself. This course covers the LATEST VERSIONS of Spring 5 and Hibernate 5! The course also includes Spring Boot and Spring Data JPA. OK, I gave it a quick try. Gson provides options to print JSON in well-defined way. By default jsonschema2pojo is bound to generate-sources but if you want resources present in the current module to be on the classpath when the plugin executes, then you should bind jsonschema2pojo to the process-resources phase. DTO, which stands for Data Transfer Object, is a design pattern conceived to reduce the number of calls when working with remote interfaces. In this tutorial, we will show you how to use Gson to convert Java object to / from JSON. This is not a duplicate of my previous blog entry of Building a RESTful Service that returns JSON using the Spring Framework. Ok, at this moment we've described the API that would be interesting for us, consumers, and most likely will suit our needs. Retrofit gives me a POJO. In this tutorial I will explain how to use Amazon's S3 storage with the Java API provided by Amazon. A style guide provides provides a map so that the code generated by a group of programmers will be consistent and, therefore, easier to read and maintain. net pdf editor control: Attach pdf to word Library application class asp. With Java 8 a java. It is developed by Pivotal Team and is used to build stand-alone and production ready spring applications. fromJson(,). The problem is that you're getting a JSON array, but you're trying to deserialize that JSON with a POJO, FilterVO in your case. How to read JSON data in Spring Boot and write to a database July 05, 2017 • ☕️ 4 min read. (202 = ACCEPTED). - add vertx client/server meters to metrics. This post will cover the building and parsing of JSON, converting JSON to and from POJOs, adding authentication headers and handling response success and failures. net pdf editor control: Attach pdf to word Library application class asp. But i got the various format of the response by calling the same request manually through my web-browser. By default jsonschema2pojo is bound to generate-sources but if you want resources present in the current module to be on the classpath when the plugin executes, then you should bind jsonschema2pojo to the process-resources phase. Convert XML or JSON to Java Pojo Classes - Online Convert XSD to Java Pojo Classes Convert Text to String variable Generate Java DAO for Data Table Generate CRUD. OK, I gave it a quick try. springframework. And also how to check weather incoming values are empty or not like mother variable is empty sp please suggest me how to do that ?. The first test uses the getForEntity method of the template, which returns a ResponseEntity. Controlling JSON to POJO mapping. This message converter won't get activated. Convert JSON to Java Object. We start first by converting to simple POJO then we’ll also show you how you can do the same for Collections Object. I wanted to use RestTemplate to retrieve JSON objects and convert them to POJO's for asserting values in the test. Type or paste a JSON string into the text area above, then click the Generate button to get your result. There are a few different approaches to testing available in Spring Boot. The first is the GBWrapper class that contains the array of GBItemsWrapper. JavaScript Object Notation (JSON) is a lightweight data exchange format. How do I get raw JSON? Instead of returning your POJO it you need to return ONLY the response object, and then consume it yourself. REST – Spring Boot May 30, 2017 June 30, 2017 T Tak Java Since its inception in 2002, the Spring framework saw a tremendous growth in terms of functionalities which ultimately made the framework a bit complex. Spring REST JSON – @ResponseBody Annotation. Spring will convert the result of the API call into some kind of JSON result. A style guide provides provides a map so that the code generated by a group of programmers will be consistent and, therefore, easier to read and maintain. Then we need to include the Spring-servlet. Spring provides out-of-box many default HttpMessageConverters, which will be used for conversion, depending on presence of certain library in project classpath. Posts about howto written by Roger Goossens. In this tutorial we'll create a Spring MVC REST client that uses Spring 3's RestTemplate. Use retrieve(), exchange() methods to make HTTP GET, POST, PUT, DELTE requests with basic authentication. @JsonView is used to filter JSON response. Spring also document this class, but again, it’s very brief. We start first by converting to simple POJO then we’ll also show you how you can do the same for Collections Object. In this tutorial I will explain how to use Amazon's S3 storage with the Java API provided by Amazon. This page will walk through Spring MVC 4 REST and Jackson @JsonView annotation integration example. Spring also document this class, but again, it’s very brief. Spring will convert the result of the API call into some kind of JSON result. 4 in blog part-1 1. We start first by converting to simple POJO then we’ll also show you how you can do the same for Collections Object. If you have a few years of Linux experience, and you're interested in sharing that with the community (and getting paid for your work of course), have a look at the "Write for Us" page. A style guide provides provides a map so that the code generated by a group of programmers will be consistent and, therefore, easier to read and maintain. Following standard Spring Boot conventions we can minimise the configuration required to get an application up and running. Note that I have to specify a @DateTimePattern and set it to ISO. If you just need to map POJOs (Plain Old Java Objects) back and forth from JSON -- maybe because you want to pass data between Java and some other programming language, or maybe because you want to persist POJOs in a JSON format -- just below is a simple PojoMapper class that does this. This post will describe a simple scenario, using Spring Data Redis, of adding a message domain object to a repository via a REST call, publishing that message to a channel, subscribers to that channel receiving that message who as a result set any long polling deferred results with the message. Spring has a list of HttpMessageConverters registered in the background. Our client is able to communicate via XML and JSON. Convert JSON to Java object. Spring Boot is an open source Java-based framework used to create a micro Service. For example, consider the following. Type or paste a JSON string into the text area above, then click the Generate button to get your result. In this episode we will look at how to post json to spring controller and have it automatically convert JSON to arraylist, object or multiple objects. StudentMapper. This chapter will give you an introduction to Spring Boot and familiarizes you with its basic concepts. There is a problem with scenarios which imply a circular dependency between the EJBs and the Spring Deployer. exchange(url, HttpMethod. Use retrieve(), exchange() methods to make HTTP GET, POST, PUT, DELTE requests with basic authentication. Converting JSON data to Java POJO with Jackson. JsonArray using a Collector created by the Collectors utility. If you do a Google search on Hibernate, you are bound to find a rather large bag of posts on the infamous lazy loading exception that Hibernate produces as part of its lazy fetching strategy. JsonObject and javax. Screencast #14: Post JSON to spring REST webservice. springframework. 1 A Jackson 2 example to convert a Student object into a java. The @JsonbProperty annotation to map JSON keys to class instance members and vice versa. Our client is able to communicate via XML and JSON. You cannot pass a POJO to another VM or another server or another process not implemented in Java. Spring is one of the most widely used Java EE frameworks. I am using Jersey's POJO mapping feature to map JSON responses to Java objects. There is a problem with scenarios which imply a circular dependency between the EJBs and the Spring Deployer. I wanted to use RestTemplate to retrieve JSON objects and convert them to POJO's for asserting values in the test. This post will describe a simple scenario, using Spring Data Redis, of adding a message domain object to a repository via a REST call, publishing that message to a channel, subscribers to that channel receiving that message who as a result set any long polling deferred results with the message. This works, but I would like to have more control. We start first by converting to simple POJO then we’ll also show you how you can do the same for Collections Object. htmlの場合でも可能)). OK, I gave it a quick try. The HTTPBuilder class provides an API to make HTTP requests and parse the responses, and builds upon the Apache AbstractHttpClient class. A comparison of Microservices Frameworks 01 November 2015 on Tech , Microservices , REST Microservice is probably one of the most used term nowadays when speaking about software architecture. springframework. Hibernate, Get Out of My POJO! June 21, 2006. Pretty print JSON 4. There are two native HTTP clients available on Android, the standard J2SE facilities, and the HttpComponents HttpClient. exchange(url, HttpMethod. - collect Getter/Setter from pojo - delete old jackson protobuf logic - convert proto model to string - [vertx] downloading, client disconnect first, should close WriteStream right now. Spring boot started data Elastic Search is the extension of spring data which used to integrate elastic search with spring boot. Person blog of Dan Vega. Allows for easy customization of response errors. The easiest way to return an object as JSON without using view resolver is to add @ResponseBody before return type. 1 Entity class as Shown in section 3. Table of Contents 1. Introduction. This builds both the RestExceptionHandler library (a. There is a problem with scenarios which imply a circular dependency between the EJBs and the Spring Deployer. The @JsonbProperty annotation to map JSON keys to class instance members and vice versa. As it turns out, it's very difficult to order a fine collection of craft beers online without ones wife finding out about it. Converting JSON data to Java POJO with Jackson Processing nested JSON objects and JSON arrays Developing a Spring REST API Setting up a Spring REST project with Maven Creating the Spring REST Controller using @RestController Running the Spring REST Controller with Eclipse and Tomcat Testing Spring REST Web Services with Postman. Type or paste a JSON string into the text area above, then click the Generate button to get your result. - collect Getter/Setter from pojo - delete old jackson protobuf logic - convert proto model to string - [vertx] downloading, client disconnect first, should close WriteStream right now. @PathVariable: This annotation will bind method argument to the URI template variable. Convert Java object to JSON 3. The following code examples are extracted from open source projects. Person blog of Dan Vega. Screencast #14: Post JSON to spring REST webservice. - add vertx client/server meters to metrics. Posts about howto written by Roger Goossens. • Spring will find name and age in the request parameters and will match them to the Employee bean by their name. Try changing this line: ResponseEntity responseEntity = restTemplate. The first test uses the getForEntity method of the template, which returns a ResponseEntity. The example shows you how to create a bucket, list it's content, create a folder into a bucket, upload a file, give the file a public access and finally how to delete all this items. @Data is a Lombok annotation to create all the getters, setters, equals, hash, and toString methods, based on the fields. To make this POJO available as a Spring service bean, we just add the @Service annotation. • More complex data conversions are possible via custom Resolvers. The entity object is simply a POJO class which has a @Entity annotation. Adding the dependency in POM. RESTful example with Tomcat and Maven. jar) and a separate peer example web application (a. Developing a Spring REST API. In this article, we will be going to discuss how to integrate Elastic Search with spring boot. Ok, at this moment we've described the API that would be interesting for us, consumers, and most likely will suit our needs. Eugen The RestTemplate class is the central tool for performing client-side HTTP operations in Spring. AJAX Version Let us now convert our non-AJAX application to an AJAX-powered version. As it turns out, it's very difficult to order a fine collection of craft beers online without ones wife finding out about it. Like XML, JSON provides a way of representing object that is both human readable and machine processable. To make this POJO available as a Spring service bean, we just add the @Service annotation. You can also follow the below lines and examples from Official doc. Adding the dependency in POM. • Spring will find name and age in the request parameters and will match them to the Employee bean by their name. Gson provides options to print JSON in well-defined way. Hi Chaitanya, I would require a clarification from you with respect to the override annotation. This post will describe a simple scenario, using Spring Data Redis, of adding a message domain object to a repository via a REST call, publishing that message to a channel, subscribers to that channel receiving that message who as a result set any long polling deferred results with the message. This works, but I would like to have more control. Retrofit gives me a POJO. There is a problem with scenarios which imply a circular dependency between the EJBs and the Spring Deployer. The responsibility of the HTTPMessageConverter is to convert the request body to a specific class and back to the response body again, depending on a predefined mime type. Spring & Hibernate For Beginners Download Free MOST POPULAR SPRING-HIBERNATE COURSE ON UDEMY – OVER 13,000 REVIEWS – 5 STARS! #bestseller. String str = g. We start first by converting to simple POJO then we’ll also show you how you can do the same for Collections Object. POJOs are highly perfomant and very easy to use in a Java program. exchange(url, HttpMethod. In our example I will provide a complete demo how to use Gson. net pdf editor control: Best convert pdf to word con. If you just need to map POJOs (Plain Old Java Objects) back and forth from JSON -- maybe because you want to pass data between Java and some other programming language, or maybe because you want to persist POJOs in a JSON format -- just below is a simple PojoMapper class that does this. As Martin Fowler defines in his blog, the main. We used the cascade attribute in the element to tell Hibernate to persist the Certificate objects at the same time as the Employee. Spring will convert the result of the API call into some kind of JSON result. ResponseEntity packagename. What you’ll learn Develop a REAL-TIME project with Spring MVC, Spring REST, Spring Boot and Hibernate CRUD … all from SCRATCH You will TYPE IN EVERY LINE of code with me in the videos. Spring & Hibernate For Beginners Download Free MOST POPULAR SPRING-HIBERNATE COURSE ON UDEMY – OVER 13,000 REVIEWS – 5 STARS! #bestseller. HelloBeer TM recently got some complaints from the Alcoholics Anonymous community. Java Code Examples for javax. Spring Framework 5: Tìm hiểu về Spring Core, Spring AOP, Spring MVC, Spring Security, Spring REST, Spring Boot và Hibernate. Many people do not care for the style guide offered by Sun. In this episode we will look at how to post json to spring controller and have it automatically convert JSON to arraylist, object or multiple objects. I've seen projects with thousands of POJO classes that all existed just so Hibernate could create them, and the only thing they were used for was to generate JSON. The responsibility of the HTTPMessageConverter is to convert the request body to a specific class and back to the response body again, depending on a predefined mime type. 61 bugs on the web resulting in org. ,it is the Gson library am using for the purpose :Gson(). RESTful example with Tomcat and maven. Our client is able to communicate via XML and JSON. Supports automatic conversion between objects and HTTP messages. JsonArray using a Collector created by the Collectors utility. There are a few different approaches to testing available in Spring Boot. Create a JSON object from a File To use a file, replace the StringReader by a FileReader. how can I convert this json data to pojo. Writing Java POJOs out as simple JSON is a good general mechanism for serializing Java Objects, to be transferred over network: sent as input for REST services, returned as output, and sometimes…. If you do a Google search on Hibernate, you are bound to find a rather large bag of posts on the infamous lazy loading exception that Hibernate produces as part of its lazy fetching strategy. DTO, which stands for Data Transfer Object, is a design pattern conceived to reduce the number of calls when working with remote interfaces. OK, I gave it a quick try. Many people do not care for the style guide offered by Sun. In our example I will provide a complete demo how to use Gson. Convert JSON to Java object. After making a GET request to a REST service the natural progression is to POST information back to the server. Creating the Spring REST Controller using @RestController. JavaScript Object Notation (JSON) is a lightweight data exchange format. The following code examples are extracted from open source projects. Early Access puts eBooks and videos into your hands whilst they’re still being written, so you don’t have to wait to take advantage of new tech and new ideas. You have above quoted as “If you don’t use the annotation then the sub class method would behave as a new method (not the overriding method) in sub class”. fromJson(jsonString, Player. @mkarneim wrote a POJO Builder that creates the builder class(es) at compilation time. There is a problem with scenarios which imply a circular dependency between the EJBs and the Spring Deployer. By default jsonschema2pojo is bound to generate-sources but if you want resources present in the current module to be on the classpath when the plugin executes, then you should bind jsonschema2pojo to the process-resources phase. RestTemplate provides an abstraction for making RESTful HTTP requests, and internally, RestTemplate utilizes a native Android HTTP client library for those requests. It also has basic support for retrieving images. As well as being key value store, Redis offers a publish subscribe messaging implementation. In this tutorial we will implement a Jersey client example with JSON support. - add vertx client/server meters to metrics. This is a Simple example of RESTful using jersey service in eclipse which is intended to explore how to implement RESTful services in our project. This builds both the RestExceptionHandler library (a. Posts about howto written by Roger Goossens. htmlの場合でも可能)). Best way to download File From Server using java spring and angular js 11:40 PM By Unknown I think the best way is to make an AJAX request which generates a file on the server. the problem is I don't think the json with "@" sign is read by the json reader when the field is in the 2nd layer, like the nickname for example. We will see how to create Gson object and how API can be used to convert between java object and JSON. I am trying to post a request to my service, but it's not working. Akka HTTP's marshalling and unmarshalling infrastructure makes it rather easy to seamlessly convert application-domain objects from and to JSON. toJson(p);. This page allows you to generate a Java source file out of a JSON Schema. Spring uses Jackson library to convert JSON requests to Java objects. Developing a Spring REST API. This document is one alternative. The responsibility of the HTTPMessageConverter is to convert the request body to a specific class and back to the response body again, depending on a predefined mime type. - Phát triển một dự án REAL-TIME với Spring MVC và Hibernate CRUD tất cả từ đầu. Spring will convert the result of the API call into some kind of JSON result. Any reactive or POJO return type. BUT they are restricted to a single VM.