When using Spring Data JPA, the repository typically returns one or more instances of the root class. There may be cases where we do not want an entire entity from the query method but are interested only in few attributes of that entity or subset of that entity with some manipulation in it. …
In the context of ORM, auditing means tracking and logging events related to persistent entities, or simply entity versioning. Spring Data provides sophisticated support to transparently keep track of who created or changed an entity and the point in time this happened.
In Previous post I explained how to get started with Spring boot Data JPA. In this post we will discuss how to use Pagination and Sorting with Spring Data.
Pagination is often helpful when we have a large dataset and we want to present it to the user in smaller chunks.
Also, we often need to sort that data by some criteria while paging.
In Previous post I explained how to get started with Spring boot. In this post we will use Spring Boot along with Spring Data.
Spring Data JPA provides complete abstraction over the DAO layer. We don’t need to write the implementation for the DAO layer anymore. Spring Data JPA handles most of the complexity and reduces the boilerplate code required by JPA.
Validation is a common requirement in all the services. When developing a REST API, it’s important to validate request data, and in case of invalid data, return a
4xx response with a precise body containing field-wise error details. Spring Boot provides strong support for this common, yet critical, task straight out of the box.
REST resources can have multiple presentations (e.g. JSON or XML) as different clients can request different representation. The mechanism for selecting a correct representation is known as content negotiation.
Content negotiation allows clients to request specific content type(s) to be returned by the server. With content negotiation, we enable a single endpoint to support different types of resource representations
Content Negotiation can be done in following ways
In Previous post I explained how to get started with Spring boot. In this post we will go through how to create RESTfull web services with Spring boot.
let’s use https://start.spring.io/ web site to generate the base for our project.
Provide basic details like Project name, Java version, spring boot version and packaging type etc..
Spring Boot helps us to create stand-alone, production-grade Spring-based applications that we can run.
Spring Boot is an opinionated addition to the Spring platform, focused on convention over configuration — highly useful for getting started with minimum effort. You can use Spring Boot to create Java applications that can be started by using
java -jar or more traditional war deployments.
Primary goals are: