Dependency Injection(DI) is the most important feature of Spring Framework. Dependency Injection is a design pattern that removes the dependency between objects so that the objects are loosely coupled. In Spring there exist two major types of Dependency Injection. Setter Injection Constructor Injection … [Read more...]
Top 80 Spring Interview Questions
1. What is Spring Framework? Spring is an open-source framework created to address the complexity of building enterprise applications. It eases the development effort by providing IOC container, Dependency Injection, Aspect-oriented programming, etc. Spring framework also allows you to connect to other frameworks such as Struts, EJB, Hibernate, etc. 2. What are the advantages … [Read more...]
Spring Boot JPA One To One Example with MySQL | Unidirectional & Bidirectional
In this article, we will learn how to create a Spring Boot JPA One To One mapping using Spring Data JPA with Foreign Key. In this approach, we will have two tables with different primary keys. The primary key of the STUDENT table (ID) will act as a foreign key for the PASSPORT table and PASSPORT table will have its own primary key (ID). … [Read more...]
Spring Security – Custom UserDetailsService Example | InMemory & Database Authentication
Previously we have learned about InMemoryUserDetailManager and JdbcUserDetailsManager. UserDetailsService is the core interface which is responsible for providing the User information to the AuthenticationManager. In this article, we will create a Custom UserDetailsService retrieves the user details from both InMemory and JDBC. … [Read more...]
Spring Security – JdbcUserDetailsManager Example | JDBC Authentication and Authorization
In the previous article, we have learned about Spring InMemoryUserDetailsManager which internally stores and retrieves the user-related information, Spring Security's JdbcUserDetailsManager class uses the database to store and retrieve the user information. In this JdbcUserDetailsManager Example, we perform Create, Read, Update, and Delete (CRUD) operations on the user details … [Read more...]
Spring Security – InMemoryUserDetailsManager Example | In-Memory Authentication
Spring In-Memory authentication uses InMemoryUserDetailsManager internally store and retrieve the user-related information which is required for Authentication. In this InMemoryUserDetailsManager Example, we will learn how to create and store the user to the in-memory HashMap, update the user credentials and finally delete the User. … [Read more...]
Spring Data MongoDB Example – MongoRepository
In this Spring Data MongoDB Example, we will build a Simple Spring Application and perform CRUD operations on the Mongo Database with the help of Spring Data MongoDB and MongoRepository. MongoDB is a document-based NoSQL database, providing high performance and high availability. Spring provides seamless integration with the Mongo database through Spring Data MongoDB which is a … [Read more...]
Spring Data REST Example – Spring Boot RESTful API + CRUD
Spring Data REST is built on top of the Spring Data repositories and it automatically exposes the repositories as REST services. Spring Data REST takes the features of Spring HATEOAS and Spring Data JPA and combines them together, using a Strategy called "RepositoryDetectionStrategy" to export the repository as a REST resource. In this Spring Data REST Example, let's create a … [Read more...]
Spring Boot MVC | Spring Boot JSP Example
In this article, we will learn how to create a Spring Boot MVC application, which is simply a Spring MVC application using Spring Boot. Unlike a typical Spring Boot application, we will be rendering the JSP page to the user. Let's get started. … [Read more...]
Spring Interceptor Example | HandlerInterceptor | HandlerInterceptorAdapter
Spring Interceptor is similar to a Filter, which is used to intercept the request and process them. Spring MVC allows you to intercept web requests for pre-handling and post-handling through Handler Interceptors. All the Interceptor class must either implement the HandlerInterceptor interface or extend the HandlerInterceptorAdapter class. Spring … [Read more...]
Spring Boot Exception Handling – @RestControllerAdvice + @ExceptionHandler
A good REST API should handle the exception properly and send the proper response to the user. The user should not be rendered with any unhandled exception. In this Spring Boot Exception Handling article, we will learn how to handle in exception in Spring Boot RESTful Web Services using @RestControllerAdvice and @ExceptionHandler … [Read more...]
Spring Security Custom Login Form Example | Java Configuration
In this Spring Security Custom Login Form Example, we will learn how to build a Spring MVC application which will be protected by Spring Security. We will be building our own login form rather than using the default form provided by Spring Security … [Read more...]
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