In this tutorial, you will learn how to use the @PostAuthorize annotation to secure the return of the method’s return value in your Spring Boot Application. The @PostAuthorize annotation is evaluated after the business logic in a method is executed and if needed will prevent the method from returning a return value. There are other…
Read More @PostAuthorize Security Annotation ExampleIn this Spring Boot Security tutorial, you will learn how to use Spring method-level security to secure RestController methods with @PreAuthorize annotation. If you are interested in video lessons, then I also show how to create user Roles and Authorities and how to use Spring Method Level Security annotations in my video course: RESTful Web…
Read More Spring Method-Level Security with @PreAuthorizeIn previous video tutorials, I have shared with you how to read Request Path parameters, Query String parameters, and Form data. In this tutorial, you will learn how to make a method in the Controller class read JSON data from an HTTP request. To read the body of an HTTP request, we will use the…
Read More Reading JSON in Spring with @RequestBodyThis tutorial will teach you how to retrieve URI path variables in your Spring MVC web application. Define Path Variable To define a path variable in the URI path, we use curly brackets. For example, the @GetMapping annotation below specifies one path variable called userId, which is surrounded by curly brackets. @GetMapping(path=”/users/{userId}”) @PathVariable Annotation To…
Read More Spring MVC: Reading URI Path VariablesIn this tutorial, I will show you how to add support for the H2 in-memory database to your Spring Boot project with Spring Security enabled. By the end of this tutorial, you will be able to watch a video demonstration of how to implement it. After following the steps below, your Spring Boot project will…
Read More Add H2 Database to Spring Boot with Spring Security: A GuideThis tutorial will guide you on how to incorporate JUnit support into your Spring Boot application based on Maven. Introduction Brief Explanation of JUnit and Its Importance in Testing JUnit is a popular open-source testing framework for Java applications. It provides a set of tools and methods for writing and running automated tests, making it…
Read More JUnit Support in Spring BootIn the software development process, testing is essential. There are two types of testing i.e. unit testing and integration testing. While unit testing focuses on testing the smallest component of an application, integration testing focuses on testing the end-to-end behavior of the application also known as endpoint testing. Integration testing verifies the @Controller and @RestController…
Read More Testing Spring Boot Applications with MockMvcIn this blog post, I will share how to copy properties from a DTO object to an Entity object and then back from an Entity object to a DTO object. DTO stands for Data Transfer Object, and it is a simple, Plain Old Java Object that typically contains class properties and getter and setter methods…
Read More DTO to Entity Conversion in JavaThis tutorial will teach you how to use project Lombok in the Spring Boot application. Overview No doubt Java is a wonderful language, but one of the drawbacks of Java is its verbose nature. This makes it fairly complicated for everyday tasks such as composing a simple POJO object. For example, constructing of methods like Getters(), Setters(),…
Read More How to use Project Lombok in Spring BootThis tutorial will teach you how to add Spring Security to your project and enable in-memory basic authentication. You will learn how to configure two different users with different Roles and Privileges. Both users’ roles and privileges will be stored in the memory of your Spring Boot application. If you use Spring Framework and OAuth,…
Read More Spring Security In-Memory AuthenticationIn this article, you will learn how to perform user authentication with Amazon Cognito in a Spring Boot application. But before we dive into that, let’s first explore what Amazon Cognito is. According to what’s mentioned on the AWS official website: Amazon Cognito lets you add user sign-up, sign-in, and access control to your web…
Read More User Authentication with Amazon Cognito in Spring Boot ApplicationDependency injection is a design pattern in which a component’s dependencies are supplied externally rather than being hardcoded within the component itself. In Spring, developers mainly use 3 different types of dependency injection: constructor-based, setter-based, and field-based. In this tutorial, we will see how to use Setter-based Dependency Injection to inject a UsersRepository into a…
Read More Setter-based Dependency Injection in SpringSpring is a popular Java-based framework for building applications. One of its core features is dependency injection, which is used to manage the relationships between objects and to make it easier to manage the dependencies in an application. In this tutorial, we will explore two of the main methods of dependency injection in Spring: constructor…
Read More Constructor vs Field Dependency Injection in SpringThis tutorial will teach you how to start your Spring Boot application on a random port number. Starting an application on a random port number is very helpful when you need to start multiple instances of the same Spring Boot application and then balance HTTP requests between the running instances. If you want to learn…
Read More Start Spring Boot App on a Random Port NumberIn this article, we will learn about Many-to-Many relationships in JPA and how to implement them in a Spring Boot application. Let’s get started! @ManytoMany annotation A many-to-many relationship occurs when multiple records in one table are associated with multiple records in another table. The @ManyToMany annotation is used to define a many-valued association with…
Read More Many-to-Many Relationship in Spring Boot Rest with JPA