Spring

Spring Boot REST Mini Project | Things to be covered in the mini project:- Layers Modules: Employee Dependencies:- PUT – Full/most of the part updatePATCH- partial update @Query: Used for select operation@Query + @Modifying: Used for non-select operation @Transaction – [commit/rollback]:- Incase of our custom query (not for predefined JPA methods), we must write this […]

RestTemplate in Spring Boot | RestTemplate class is used to make an HTTP call to any web service Application (java and non-java apps) that reads the final response into ResponseEntity or a direct time. It supports auto-type conversion of Input/Output into GlobalFormat (i.e. Object to JSON/XML and JSON/XML to Object). Use case:- Movie Booking application

Hikari Connection Pooling in Spring Boot | Pool is a group of Objects that are of the same type. Example: Admin Pool = Admin Objects, Spring Constant Pool = String Objects, Product Pool = Product Objects, ..etc. Connection Pool = Database Connection. By default, Spring Boot uses HikariConfig which comes with default auto-configuration. When we

Spring Boot Unit Testing (JUnit with Mockito) | The spring-boot-starter-test dependency includes junit-jupiter, vintage, mockito dependencies. Mocking means creating dummy implementations or objects. If we want to test the Spring Boot application, then the following dummies are required:- We need to provide all the above details using Mock support. If run starter class that takes

Swagger with Spring Boot REST | POSTMAN Tool tests our rest controllers. This is a fully manual tool, we should enter all details: URL, MethodType, Param, JSON Input, Header Details, etc. We should list all URLs in the application, if it is a small application then it is fine. But if the application is big

Exception Handling in Spring Boot REST | Exception Handling in Spring Boot REST can be done in the following ways:- Among these customized error message is most commonly used. First, let us see the default error message of Spring Boot REST with @ResponseStatus then we will see the customized error message in Spring Boot REST

Spring REST Introduction | We will discuss Spring REST, HttpStatus, ResponseEntity, Request Method, and e.t.c. Webservices (ReST) Web services represent the integration of Applications. Linking two or more applications that are running on the same/different servers. 2 different web services can be in different technologies/languages. For example, one web service uses Java and another one

MediaType Annotations and HttpStatus | Here we will discuss @RequestBody, @ResponseBody, and HttpStatus. @RequestBody and @ResponseBody in Spring REST Using @ResponseBody is optional because @RestController will take care of that. But @RequestBody annotation must be applied externally. Example Application Create a Spring starter project and add the following dependencies:- Lombok, Spring Web. Start the application.

@RequestParam and @PathVariable in Spring Boot REST | We will discuss how to pass request parameters to the rest APIs. To pass request parameters @RequestParam and @PathVariable are used in Spring. First, let us see @RequestParam. @RequestParam in Spring Boot REST Request Parameter format: URL?key=val&key=val&key=val…. It even supports type conversion, (String -> int) based on