This tutorial will teach you how to use the @Query annotation to execute custom SQL queries. Spring Data JPA provides many query methods that are ready to use, allowing us to perform basic CRUD(Create, Read, Update and Delete) operations. However, there may be situations where we need to execute a custom SQL query even though…
Read More Spring Data JPA Native SQL QueryIn this blog post, I will share the Spring annotations used to map HTTP requests to specific handler methods. These annotations include @PostMapping, @GetMapping, @PutMapping, and @DeleteMapping. While most Spring Boot applications use the @RequestMapping annotation, which I will also cover in this post, I’ll begin with the newer shortcut annotations that have been available…
Read More Spring Annotations @PostMapping, @GetMapping, @PutMapping and @DeleteMappingIn this Spring Security tutorial, you will learn how to enable and use the Method Level Security with a @Secured annotation. @Secured is a Spring Security annotation used to specify that a method should be executed only if the authenticated user has the required roles or authorities. When you use this annotation, you can specify…
Read More Spring Security @Secured: Method-Level ProtectionIn 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 this Java tutorial, I am going to share with you different ways how to generate a random string of characters. You will learn to generate the following types of random Strings of characters: alpha-numeric String of characters of any length or of a specific length, Letters only, Numbers only. I hope you will find…
Read More Random String of Characters in Java. Different Examples.In 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 read JSON from HTTP Post request body in Spring Boot application. To read the body of an HTTP Post request, we will use the @RequestBody annotation…
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. Spring Boot Starter Test Dependency To add JUnit and Mockito support to your Maven-based Spring Boot application, include the following dependencies in the <dependencies> section of your pom.xml file: <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> By adding…
Read More JUnit Support in Spring BootIn this tutorial, we will generate a random alpha-numeric string of characters, which can be used as a user password. Password Requirements When generating passwords, it’s important to set requirements that make them strong and difficult to guess. Here are some guidelines to follow when creating password requirements: Length The length of a password is…
Read More Generate Secure Password in JavaIn this tutorial, you will learn how to use @MockBean annotation in your Unit tests. @MockBean annotation is used to create and place mocks into Spring Application Contexts. If Spring Application Context does already have a bean of the same type then this bean will be replaced with a mock object. Otherwise, a new bean(mock)…
Read More How to use @MockBean AnnotationIn 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 JavaJava provides a lot of built-in methods for manipulating strings. These methods make it easy to perform common string operations like concatenation, splitting, and searching. To find more code examples that demonstrate how to work with Strings in Java, check out the following tutorials: Java String Working With Strings in Java – Part 1 Working…
Read More Java String Methods Every Developer Should KnowA test suite is a collection of test cases that are run together as a single unit. It helps to organize and manage the execution of multiple test cases. Test suites can be used to group related tests or to test different aspects of a complex system. They can also be used to run tests…
Read More JUnit 5 Test Suite Tutorial