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Tag Archives: Spring

Creating a REST API with Spring Boot and MongoDB

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This year I greeted Christmas in a different fashion: I was a part of the Java Advent Calendar. Let’s boot up for Christmas: Spring Boot is an opinionated framework that simplifies the development of Spring applications. It frees us from the slavery of complex configuration files and helps us to create standalone Spring applications that don’t need an external servlet ...

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Spring Data JPA Tutorial: Getting the Required Dependencies

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Before we can create an application that uses Spring Data JPA, we need to get the required dependencies. This blog post identifies the required components and describes how we can get them by using Maven. Let’s get started. Additional Reading: If you are not familiar with Spring Data JPA, you should read the following blog post before you continue reading ...

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Spring RestTemplate with a linked resource

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Spring Data REST is an awesome project that provides mechanisms to expose the resources underlying a Spring Data based repository as REST resources. Exposing a service with a linked resource Consider two simple JPA based entities, Course and Teacher:           @Entity @Table(name = "teachers") public class Teacher { @Id @GeneratedValue(strategy = GenerationType.AUTO) @Column(name = "id") private ...

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Spring request-level memoization

spring-interview-questions-answers

Introduction Memoization is a method-level caching technique for speeding-up consecutive invocations. This post will demonstrate how you can achieve request-level repeatable reads for any data source, using Spring AOP only.         Spring Caching Spring offers a very useful caching abstracting, allowing you do decouple the application logic from the caching implementation details. Spring Caching uses an application-level ...

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Spring Data JPA Tutorial: Introduction

spring-interview-questions-answers

Creating repositories that use the Java Persistence API is a cumbersome process that takes a lot of time and requires a lot of boilerplate code. We can eliminate some boilerplate code by following these steps:                 Create an abstract base repository class that provides CRUD operations for entities. Create the concrete repository class ...

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Avoid unwanted component scanning of Spring Configuration

spring-interview-questions-answers

I came through interesting problem on Stack Overflow. Brett Ryan had problem that Spring Security configuration was initialized twice. When I was looking into his code I spot the problem. Let me show show the code. He has pretty standard Spring application (not using Spring Boot). Uses more modern Java servlet Configuration based on Spring’s AbstractAnnotationConfigDispatcherServletInitializer.         ...

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Black Box Testing of Spring Boot Microservice is so easy

spring-interview-questions-answers

When I needed to do prototyping, proof of concept or play with some new technology in free time, starting new project was always a little annoying barrier with Maven. Have to say that setting up Maven project is not hard and you can use Maven Archetypes. But Archetypes are often out of date. Who wants to play with old technologies? ...

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Externalizing session state for a Spring-boot application using spring-session

spring-interview-questions-answers

Spring-session is a very cool new project that aims to provide a simpler way of managing sessions in Java based web applications. One of the features that I explored with spring-session recently was the way it supports externalizing session state without needing to fiddle with the internals of specific web containers like Tomcat or Jetty. To test spring-session I have ...

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Spring boot war packaging

spring-interview-questions-answers

Spring boot recommends creating an executable jar with an embedded container (tomcat or jetty) during build time and using this executable jar as a standalone process at runtime. It is common however to deploy applications to an external container instead and Spring boot provides packaging the applications as a war specifically for this kind of a need. My focus here ...

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