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What's New In Spring Data Release Gosling?

Engineering | Christoph Strobl | September 04, 2015 | ...

Over 300 issues fixed across 12 projects makes it pretty hard to keep track on what has happened since the last release. So here's a more detailed excerpt of some of the new features we've been cooking during the last iteration.

Ad-hoc JPA fetch graphs.

Since the Dijkstra release train we have been able to refer to the named entity graph declared on the entity through the @EntityGraph annotation in JPA-backed repositories. In the example below this forces firstname and lastname to be loaded eagerly, while all others remain lazily loaded.

@Entity
@NamedEntityGraphs(
  @NamedEntityGraph(name…
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React.js and Spring Data REST: Part 1 - Basic Features

Engineering | Greg L. Turnquist | September 01, 2015 | ...
To see updates to this code, visit our React.js and Spring Data REST tutorial.

Welcome Spring community,

This is the first of several blog entries. In this session, you will see how to get a bare-bones Spring Data REST application up and running quickly. Then you will build a simple UI on top of it using Facebook’s React.js toolset.

Step 0 - Setting up your environment

Feel free to grab the code from this repository and follow along.

If you want to do it yourself, visit http://start.spring.io and pick these items:

  • Rest Repositories
  • Thymeleaf
  • JPA
  • H2

This demo uses Java 8, Maven Project, and the latest stable release of Spring Boot. This will give you a clean, empty project. From there, you can add the various files shown explicitly in this session, and/or borrow from the repository listed above.

In the beginning…​

In the beginning there was data. And it was good. But then people wanted to access the data through various means. Over the years, people cobbled together lots of MVC controllers, many using Spring’s powerful REST support. But doing over and over cost a lot of time.

Spring Data REST addresses how simple this problem can be if some assumptions are made:

  • The developer uses a Spring Data project that supports the repository model.
  • The system uses well accepted, industry standard protocols, like HTTP verbs, standardized media types, and IANA-approved link names.

Declaring your domain

The cornerstone of any Spring Data REST-based application are the domain objects. For this session, you will build an application to track the employees for a company. Kick that off by creating a data type like this:

src/main/java/com/greglturnquist/payroll/Employee.java
@Data
@Entity
public class Employee {

private @Id @GeneratedValue Long id;
private String firstName;
private String lastName;
private String description;

private Employee() {}

public Employee(String firstName, String lastName, String description) {
	this.firstName = firstName;
	this.lastName = lastName;
	this.description = description;
}



}

  • @Entity is a JPA annotation that denotes the whole class for storage in a relational table.
  • @Id and @GeneratedValue are JPA annotation to note the primary key and that is generated automatically when needed.
  • @Data and @RequiredArgsConstructor are Project Lombok annotations to autogenerate getters, setters, constructors, toString, hash, equals, and other things. It cuts down on the boilerplate.

This entity is used to track employee information. In this case, their name and job description.

Note
 Spring Data REST isn’t confined to JPA. It supports many NoSQL data stores, but you won’t be covering those here.

Defining the repository

Another key piece of a Spring Data REST application is to create a corresponding repository definition.

src/main/java/com/greglturnquist/payroll/EmployeeRepository.java
public interface EmployeeRepository extends CrudRepository<Employee, Long> {

}

  • The repository extends Spring Data Commons' CrudRepository and plugs in the type of the domain object and its primary key

That is all that is needed! In fact, you don’t even have to annotate this invisible if its top-level and visible. If you use your IDE and open up CrudRepository, you’ll find a fist full of pre-built methods already defined.

Note
 You can define your own repository if you wish. Spring Data REST supports that as well.

Pre-loading the demo

To work this this application, you need to pre-load it with some data like this:

src/main/java/com/greglturnquist/payroll/DatabaseLoader.java
@Component
public class DatabaseLoader implements CommandLineRunner {

private final EmployeeRepository repository;

@Autowired
public DatabaseLoader(EmployeeRepository repository) {
	this.repository = repository;
}

@Override
public void run(String... strings) throws Exception {
	this.repository.save(new Employee("Frodo", "Baggins…
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This Week in Spring - September 1, 2015

Engineering | Josh Long | September 01, 2015 | ...

Welcome to another installment of This Week in Spring! The Spring team is hard at work on all the latest and greatest ahead of the SpringOne2GX event in Washington DC! Time is really flying! I can't beleive what we're staring down September already! This week I'm in Tokyo, Japan, participating in the Spring User Group's huge Spring in Summer event where I gave a keynote and two talks, on Spring Boot and Spring Cloud. The one day event attracted some of the company's largest websites and was a lot of fun!

Anyway, without further ado, let's get to it!

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This Week in Spring - August 25th, 2015

Engineering | Josh Long | August 25, 2015 | ...

Welcome to another installment of This Week in Spring! This week I'm in Rio de Janeiro, Brazil for the lovely QCon Rio conference, and then I'm off to Tokyo, Japan for a Spring in Summer conference for local Spring users!

The team is abuzz with excitement leading up to this year's SpringOne2GX 2016, the biggest and best SpringOne2GX, ever! This year, you're going to see us do WAY more with WAY less and get it to production, to boot! This is exciting for everyone of us and it will be for audience members, as well!

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Migrating a Spring Web MVC application from JSP to AngularJS

Engineering | Michael Isvy | August 19, 2015 | ...

Note on authors

This post is a guest post by Han Lim and Tony Nguyen. Han and Tony have done a great presentation at our Singapore Spring User Group on Spring + Angular JS. This blog is based on their presentation.

Abstract

In this article, we try to describe our experiences moving from server-side rendering view technologies like JSP, Struts and Velocity to client-side rendering view technologies using AngularJS, a popular Javascript framework for modern browsers. We will talk about some of the things to look out for when you are making this change and potential pitfalls you may encounter. If…

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This Week in Spring - August 18, 2015

Engineering | Josh Long | August 19, 2015 | ...

Welcome to another installment of This Week in Spring! As usual, we've got a lot to cover so let's get to it! This week I'm back in São Paulo, Brazil, to visit customers, then it's off to Rio for QCon Rio! If you're in either city, message me on Twitter and let's grab a coffee!

  • Today, Pivotal CEO Paul Maritz stepped down [and welcomed Pivotal Labs founder Rob Mee as the new CEO. There's a post by Paul and by Rob. Thank you, Paul, and welcome Rob!
  • the amazing Scott Frederick just announced the general availability of Spring Cloud Connectors 1.2.0! - check this out!
  • Spring ninja Stéphane Nicoll just announced Spring Boot 1.3M4, with fixes and improvements aplenty!
  • Spring Integration lead Gary Russell just announced a CRAZY packed new Spring Integration 4.2 release including, but not limited to, support for security Context Propagation, STOMP client channel adapters, metrics, new Spring Framework 4.2 event channel adapters, a process barrier component, last modified file list filters, codec, JMS shared subscriptions, (S)FTP improvements, SOAP Action Propagation, …
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This Week in Spring - August 11, 2015

Engineering | Josh Long | August 12, 2015 | ...

Welcome to another installation of This Week in Spring! As usual, we've got a lot to cover so let's get to it!

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Spring Statemachine 1.0.0.M3 Released

Engineering | Janne Valkealahti | August 04, 2015 | ...

We’re pleased to announce a third milestone release of Spring Statemachine 1.0.0.M3.

A lot has happened since a previous milestone and getting here took a bit more time we originally estimated. Now that we're here, let's crack it and see what new features we have in this release.

Beyond usual bug fixes here is a list of main new features:

  • Distributed state machine
  • Persisting state machine context
  • Relax use of enums as states and events
  • Programmatic instantiation of state machines
  • New recipe modules
  • New samples (persist, zookeeper, web)

#Distributed state machine

Distributed state is a new…

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This Week in Spring - August 4th, 2015

Engineering | Josh Long | August 04, 2015 | ...

Welcome to another installment of This Week in Spring! This week I'm in Washington D.C., delivering some cloud-native realtalk at the Agile 2015 conference with my pal Andrew Clay Shafer then it's off to Denver, CO, again to speak to customers! If you're in either area, say hi!

We're fast approaching SpringOne2GX 2015! Things are getting exciting around here as the team delivers more and more amazing bits! The weeks to come, leading into SpringOne2GX, are my favorite time of the year. Watch this space for new releases aplenty!

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This Week in Spring - July 28, 2015

Engineering | Josh Long | July 29, 2015 | ...

Welcome to another installment of This Week in Spring! We've got a lot to cover so let's get to it!

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