We are pleased to announce the availability of the Spring AMQP (for Java) 1.3.0.RC1 release candidate. It is expected to be the final candidate before GA.

The release includes some significant new features, including:

• Listener Container

  • The listener container concurrency can be changed without first stopping the container and the listeners will be adjusted accordingly
  • The listener container can dynamically adjust the concurrent consumers, based on workload
  • The listener container now supports consumer priority (with RabbitMQ 3.2.x or greater)
  • The listener container now supports the configuration of an exclusive consumer

• Rabbit Template

  • The RabbitTemplate now has several convenient receiveAndReply methods
  • The RabbitTemplate can now be configured with a RetryTemplate, enabling clients to not have to deal directly with broker connectivity issues.

• Connection Factory

  • The Connection Factory can now cache connections rather than all users sharing the same connection (and, since M2, channels can be cached within cached connections)
  • There is now a SimpleRoutingConnectionFactory to determine which connection factory to use at runtime

• Other Key Features

  • A fluent Java API is now provided to build a Message (and MessageProperties)
  • A fluent Java API is now provided for building a listener container retry interceptor
  • When using a retry interceptor, a new RepublishMessageRecoverer is available to republish failed messages (with stack trace) to another exchange

Spring Boot 1.0 RC4 just dropped and 1.0 can't be too far behind, and there are all sort of cool features coming!

One of the many questions I get around this concerns deployment strategies for Boot applications. Spring Boot builds on top of Spring and serves wherever Spring can serve. It enjoys Spring's portability. Spring Boot lets the developer focus on the application's development first, and removes the need to be overly concerned with every other aspect of its lifecycle, including deployment and management.

Speakers: Oliver Gierke and Thomas Darimont

Slides: https://speakerdeck.com/olivergierke/spring-data-repositories-best-practices

The repository abstraction layer is one of the core pieces of the Spring Data projects. It provides a consistent, interface-based programming model to allow implementing data access layers easily for relational and NoSQL databases. We will have a look at the lessons learned from the application of it in various customer projects and summarize best practices for you to apply in your projects. The session will also discuss advanced features like the Querydsl integration, the integration of custom implementation code as well as hooks into Spring MVC and Spring HATEOAS.

Welcome to another installment of This Week in Spring.

As usual, we've got a lot to cover so let's get to it!

1. Spring Batch and Boot co-founder Dr. Dave Syer has announced that Spring Boot RC4 is now available. Check out the latest cut for all the goodies!
2. There is a new guide that details how to use Spring Data REST
3. Spring Data ninja Christoph Strobl has announced that Spring Data Redis 1.2 is now available.
4. Don't miss Mattias Arthursson on a webinar March 18th, presenting Spring LDAP 2.0.0.
5. Join Juergen Hoeller and the Spring Team for a webinar on Java 8 and Spring Framework 4.0 on March 25!
6. David Turanski has put together a nice post on how to use Groovy for bean configuration
7. Alvaro Videla's and Jan Machacek's talk from SpringOne2GX 2013, RabbitMQ is the new King, is now available online
8. Gary Russell's SpringOne2GX 2013 talk introducing Spring Integration's internals is now online
9. Pance Cavkovski has a nice post demonstrating the web socket support from the JavaWebSocket project, Java EE 7 and Spring 4.
10. Norris Shelton Jr. has a nice post on accessing the Spring Security principal from the currently installed Authentication object using a custom annotation
11. Quinten Krijger has a nice post on how to manage session concurrency with Spring Security and Spring MVC
12. Tomasz Nurkiewicz writes about how to build a custom Spring XML namespace. He makes a great point at the beginning, though: Spring doesn't require XML!
13. The Not Just Another Blog blog looks at how to override the Spring Security filter chain
14. Thys Michels has a short-and-sweet post on how to configure a Spring application using Java configuration to consume an ElasticSearch service on Heroku.

Spring Data Redis 1.2.0 has been released and is now available from Maven Central. This release sums up the fixes and enhancements from 1.1.1 and RC1 plus an updated documentation. The release has been tested against Redis 2.4.6, 2.6.17, 2.8.6 as well as the recent 3.0-beta1 using the latest Spring framework 3.2 and 4.0 versions.

Reference Documentation | Changes | JavaDoc

Up next SD Redis will join the Spring Data release train Dijkstra. We are looking forward to your feedback on Twitter or in the issue tracker.

Recorded SpringOne2GX 2013 in Santa Clara, CA

Speaker: Gary Russell

A comprehensive review of message routing within a flow - including

• exactly how and when replyChannel and errorChannel headers are used
• how and when these headers apply in an error flow
• differences between synchronous and asynchronous processing (with task executors and pollers)
• Use of SpEL (for messagemethod mapping as well as certain "dynamic" config attributes)
• Type conversion (via SpEL, datatype channels, etc) Implicitly created channels
• How chains work How messages are mapped to methods when a message arrives at a component
• How gateway methods are mapped to messages (and a first look at some enhancements we are considering)
• Options for synchronous and asynchronous flows simple multi-threading aggregation aggregating messages from different sources
• How to debug Spring Integration applications Advanced configuration techniques and more...

Recorded at SpringOne2GX 2013 in Santa Clara, CA.

Speakers: Alvaro Videla, Jan Machacek

Jan will show how to use RabbitMQ to connect components on different platforms. After a few introductory slides explaining the main concepts, the rest of the talk will be live code. The coding will begin by showing Spring Integration code to connect to RabbitMQ to send and receive messages--think byte[] values back and forth to start with. Jan will then show the real power of RabbitMQ by replacing the RPC server component by native code in C++: we will write image processing component. To make matters even better--faster--we will then use CUDA to perform the image processing. Come to Jan's talk and demo if you want to find out how to use RabbitMQ in the core of your application, especially if your application needs to tie together code on completely different platforms and if it performs heavy number crunching or image processing. You do not need to have deep knowledge of Spring Integration, AMQP or OpenCV, ...; all that you will need is your inner geek.

Spring Boot 1.0.0 (RC4) has been released and is available in the repo.spring.io repository. There are some bug fixes from RC3 and a load of updated third-party dependencies. New features include

• Support for Spring Loaded reloading of classes during development in Maven and Gradle builds.
• A starter pom for spring-data-rest (and a sample).
• Lots of new documentation (all in the source code but published as usual at http://projects.spring.io/spring-boot.
• Automatic main class detection for "gradle run".
• Support for relaunching and incrementing Spring Batch jobs on startup.

This post is intended to introduce the Groovy Bean Builder to Java developers as a powerful alternative or supplement to Java @Configuration and XML configuration. The Spring Framework release 4.0 includes a port of the Grails Bean Builder to the core Spring Framework, providing a Groovy DSL for configuring Spring applications. Groovy and Grails developers are no doubt familiar with configuring Spring applications this way and I expect the rest of you are already thinking "How cool is that?"

Don't worry if you're not a Groovy expert. Just as many Java programmers use another popular Groovy DSL, Gradle, to build applications, you only need to know some basic syntax to get started. Sample code is available on github.

Hot on the heels of Spring Data's Codd GA release, there is a new Getting Started guide for Spring Data REST, Accessing Data with REST. It shows you how to create up an application with a JPA backend and a RESTful, hypermedia-driven front end.

Spring Data REST does all the heavy lifting of building a powerful RESTful front end as well as writing the JPA queries for the back end. To top it off, the guide leverages Spring Boot so you are using the latest-and-greatest from the Spring team.

Cheers!