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This Week in Spring - October 6th, 2015

Engineering | Josh Long | October 07, 2015 | ...

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

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Spring REST Docs 1.0.0.RELEASE

Releases | Andy Wilkinson | October 07, 2015 | ...

I'm delighted to announce that Spring REST Docs 1.0.0.RELEASE has been released. It's available from Maven Central and our release repository.

What is Spring REST Docs?

Spring REST Docs helps you to document RESTful services. It combines hand-written documentation written with Asciidoctor and auto-generated snippets produced with Spring MVC Test. This approach frees you from the limitations imposed by tools like Swagger. It helps you to produce documentation that is accurate, concise, and well-structured. This documentation then allows your users to get the information they need with a minimum…

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Evolving Spring Initializr

Engineering | Brian Clozel | October 06, 2015 | ...

We're happy to release today the new version of Spring Initializr at https://start.spring.io !

What started out as a small, in-house web application that generates Spring Boot projects, grew into something bigger than we expected. You can now use Spring Initializr on the web, in your favorite IDE (Eclipse STS and IntelliJ IDEA) and even with your command-line tools (try curl https://start.spring.io).

In the meantime, the Spring portfolio is growing and we received a lot of useful feedback from the Spring community. Because nothing beats actual data, we've improved the service to export its metrics to a centralized redis instance, before the summer. This allows us to keep a reliable set of statistics for a long period of activity (and regardless of the number of instances we deploy on Pivotal Web Services…

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Spring Tool Suite 3.7.1 released

Releases | Martin Lippert | October 06, 2015 | ...

Dear Spring Community,

I am happy to announce the 3.7.1 release of the Spring Tool Suite, our Eclipse-based tooling.

Highlights from this release include:

  • updated to Eclipse Mars.1 (4.5.1), including a number of fixes for JDT and m2e
  • updated to Pivotal tc Server 3.1.2
  • various improvements to the Spring Boot YML properties editor
  • improvements to the Spring Boot Starter wizard
  • new support for Spring Boot Devtools, including ability to attach Java debugger to CF deployed apps.
  • the new spring boot dashboard, currently in beta, but definitely the highlight of this release

To download the distributions, please go visit:

Detailed new and noteworthy notes can be found here: STS 3.7.1 New & Noteworthy.

STS 3.7.2 is scheduled to ship in December 2015.

Enjoy!

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A brief update on Java EE 7 adoption

News | Juergen Hoeller | October 06, 2015 | ...

A reminder: Every time somebody shows you a survey result with a Java EE 7 usage column, in particular when talking about production usage, double-check what they actually asked for. Does Hibernate 4.3 usage count as Java EE 7, just because it's JPA 2.1 (EE 7 level but run standalone)? Does Tomcat 8 usage count as Java EE 7, just because it's Servlet 3.1? And of course, does running a Spring application with any such individual providers count as EE 7?

Take such statistics with a big grain of salt: They typically do not ask for "native Java EE 7 platform usage" but are being presented that way eventually. Why is it a safe assumption that they did not ask for full Java EE 7 platform usage in production? Well, remember my blog post from back in June, which is still as valid in late 2015. In the meantime, the only real news is that there is no news since IBM released their EE 7 support in WebSphere's Liberty Profile. All in all, responders to such survey…

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This Week in Spring - September 29, 2015

Engineering | Josh Long | September 30, 2015 | ...

Welcome to another installation of This Week in Spring! To those of you reading from the US, let me be the first to wish you a very happy national coffee day! As usual, we've got a lot to cover so let's get to it!

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React.js and Spring Data REST: Part 3 - Conditional Operations

Engineering | Greg L. Turnquist | September 29, 2015 | ...
To see updates to this code, visit our React.js and Spring Data REST tutorial.

In the previous session, you found out how to turn on Spring Data REST’s hypermedia controls, have the UI navigate by paging, and dynamically resize based on changing the page size. You added the ability to create and delete employees and have the pages adjust. But no solution is complete with taking into consideration updates made by other users on the same bit of data you are currently editing.

Feel free to grab the code from this repository and follow along. This session is based on the previous session’s app with extra things added.

To PUT or not to PUT, that is the question

When you fetch a resource, there is risk is that it might go stale if someone else updates it. To deal with this, Spring Data REST integrates two technologies: versioning of resources and ETags.

By versioning resources on the backend and using ETags in the frontend, it is possible to conditially PUT a change. In other words, you can detect if a resource has changed and prevent a PUT (or a PATCH) from stomping on someone else’s update. Let’s check it out.

Versioning REST resources

To support versioning of resources, define a version attribute for your domain objects that need this type of protection.

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 @Version @JsonIgnore Long version;

private Employee() {}

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



}

  • The version field is annoated with javax.persistence.Version. It causes a value to be automatically stored and updated everytime a row is inserted and updated.

When fetching an individual resource (not a collection resource), Spring Data REST will automatically add an ETag response header with the value of this field.

Fetching individual resources and their headers

In the previous session you used the collection resource to gather data and populate the UI’s HTML table. With Spring Data REST, the _embedded data set is considered a preview of data. While useful for glancing at data, to get headers like ETags, you need to fetch each resource individually.

In this version, loadFromServer is updated to fetch the collection and then use the URIs to retrieve each individual resource.

src/main/resources/static/app.jsx - Fetching each resource
loadFromServer: function (pageSize) {
    follow(client, root, [
        {rel: 'employees', params: {size: pageSize}}]
    ).then(employeeCollection => {
        return client({
            method: 'GET',
            path: employeeCollection.entity._links.profile.href,
            headers: {'Accept': 'application/schema+json'}
        }).then(schema => {
            this.schema = schema.entity;
            this.links = employeeCollection.entity._links;
            return employeeCollection;
        });
    }).then(employeeCollection => {
        return employeeCollection.entity._embedded.employees.map(employee =>
                client({
                    method: 'GET',
                    path: employee._links.self.href
                })
        );
    }).then(employeePromises => {
        return when.all(employeePromises);
    }).done(employees => {
        this.setState({
            employees: employees,
            attributes: Object.keys(this.schema.properties),
            pageSize: pageSize,
            links: this.links
        });
    });
},
  1. The follow() function goes to the employees collection resource.
  2. The then(employeeCollection ⇒ …​) clause creates a call to fetch JSON Schema data. This has a sub-then clause to store the metadata and navigational links in the <App/> component.
    • Notice that this embedded promise returns the employeeCollection. That way, the collection can be passed onto the next call while letting you grab the metadata along the way.
  3. The second then(employeeCollection ⇒ …​) clause converts the collection of employees into an array of GET promises to fetch each individual resource. This is what you need to fetch an ETag header for each employee.
  4. The then(employeePromises ⇒ …​) clause takes the array of GET promises and merges them into a single promise with when.all(), resolved when all the GET promises are resolved.
  5. loadFromServer wraps up with done(employees ⇒ …​) where the UI state is updated using this amalgamation of data.

This chain is implemented in other places as well. For example, onNavigate(), which is used to jump to different pages, has been updated to fetch individual resources. Since it’s mostly the same as what’s shown above, it’s been left out of this session.

Updating existing resources

In this session, you are adding an UpdateDialog React component to edit existing employee records.

src/main/resources/static/app.jsx - UpdateDialog component
var UpdateDialog = React.createClass({

handleSubmit: function (e) {
    e.preventDefault();
    var updatedEmployee = {};
    this.props.attributes.forEach(attribute =&gt; {
        updatedEmployee[attribute] = React.findDOMNode(this.refs[attribute]).value.trim…
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Check out the new "Creating CRUD UI with Vaadin" guide

Engineering | Greg L. Turnquist | September 28, 2015 | ...

Greetings Spring community,

Today we have published a new guide: Creating CRUD UI with Vaadin.

This guide, written by the Vaadin team, shows how to nicely build a UI that taps into Spring Data, but doesn't require writing a single line of JavaScript or HTML code.

Vaadin is real cool:

  • Comes with its own Spring Boot starter
  • Works nicely with constructor injection
  • Makes it dirt simple to plugin persistence solutions like Spring Data
  • Is armed with an arsenal of plugins to grow into real applications

Check out this newly minted guide and have fun!

As a follow up to SpringOne 2GX, we have identified some more guides that need to be written. The story of cloud native is sweeping the development community, and people are asking for more solutions. Our job shouldn't be racking and stacking servers or building infrastructure. Instead, we should focus on smooth and easy solutions. Coding things cloud native…

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This Week in Spring - September 22nd, 2015

Engineering | Josh Long | September 22, 2015 | ...

Welcome to another installment of This Week in Spring! This week, fresh after an incredible SpringOne2GX 2015, I'm.. a little burnt if I'm honest! :D BUT, Spring endures and I'm this week in Amsterdam with our pal Martin Deinum helping a large group of developers make the cloud native journey with Spring Boot, Spring Cloud and Cloud Foundry.

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Java DSL for Spring Integration 1.1 GA is Available

Engineering | Artem Bilan | September 22, 2015 | ...

Dear Spring Community!

On behalf of Spring Integration team I'm pleased to announce that the 1.1 GA of Spring Integration Java DSL is now available from the Release Repository and Maven Central:

For Gradle use this dependency:

'org.springframework.integration:spring-integration-java-dsl:1.1.0.RELEASE'

For Maven this:

<dependency>
     <groupId>org.springframework.integration</groupId>
     <artifactId>spring-integration-java-dsl</artifactId>
     <version>1.1.0.RELEASE</version>
</dependency>

First of all a big thanks to everyone who visited my talk at the SpringOne 2GX 2015 last week…

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