Spring framework version 5 with support from Java 8 and above, can help us using Functional Programming in Java code. And Spring WebFlux is no exception. We can also build Reactive web applications using Lambda Expression. In this tutorial, I will guide you all how… Read More
As I said in my previous post, we can develop Reactive web applications using @RestController or @Controller annotations in Spring MVC using Spring WebFlux. How is it in detail? We will find out in this tutorial. First, I will create a Spring Boot project with… Read More
Spring Boot provides us with several ways to create a new project using Spring Initializr, but the easiest way that many programmers always use that is the Spring Initializr Web. In this tutorial, I will guide you all on how to create a new Spring… Read More
Spring framework version 5 has been released along with a new module, Spring WebFlux, with functionality that helps us build Reactive web applications. How is it in detail? In this tutorial, I will introduce you to some basic knowledge about Spring WebFlux! The first thing… Read More
To specify the format that a request can process for a user request, such as the JSON data format, we can use the @RequestMapping annotation with the consumes property in Spring MVC. How is it in detail? Let’s find out in this tutorial! First, I… Read More
In the previous tutorial, I introduced to you all about Reactive Streams in Java which implements Reactive Streams specification. In this tutorial, I will introduce you all one more library that also implements the Reactive Streams specification: it is Project Reactor. How is it in… Read More
We usually use the @Controller annotation to develop Spring MVC applications, but since version 4.x, Spring has introduced another annotation called @RestController. What is the purpose of annotation @RestController? What is the difference between @Controller annotation and @RestController annotation? In this tutorial, let’s find out!… Read More
In this tutorial, we will research together on a final annotation in JPA, beside @ManyToOne, @OneToOne, @OneToMany annotation, to express the relationship between any two tables in the database. That is the annotation @ManyToMany! In case, any two tables have many-many relationships, such as a… Read More
To specify the data format that will be returned to the user when they request a URL, in Spring MVC we can use the @RequestMapping annotation with the produces attribute. How is it in detail? Let’s find out in this tutorial! First, I will create… Read More
Suppose, you are working on a project where the database has two tables, such as student and clazz, structured like below:
|
1 2 3 4 5 6 7 8 9 10 11 12 13 |
CREATE TABLE `clazz` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; CREATE TABLE `student` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL, `clazz_id` int(11) DEFAULT NULL, PRIMARY KEY (`id`), FOREIGN KEY (`clazz_id`) REFERENCES `clazz` (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; |
As you can see, the clazz table has columns id and name with the primary key id. Student table has columns id, name… Read More
