My last blog post was based on a Spring AMQP stocks sample that involved reacting to external events. This blog post continues that theme with a chat sample where the external events are not AMQP messages but rather HTTP POST requests. Later on I'll switch to a distributed chat where the events will be Redis Read more…

In my last post I discussed how to make a Spring MVC controller method asynchronous by returning a Callable which is then invoked in a separate thread by Spring MVC. But what if async processing depended on receiving an external event that will take place in a thread outside the control of the current request Read more…

In previous posts I introduced the Servlet 3, async support feature in Spring MVC 3.2 M1 and provided background on techniques for real-time updates. In today's post I'll turn to the technical details of the new Spring MVC feature and its impact on various aspects of the Spring MVC request lifecycle. To make any existing Read more…

In my last post I introduced the new Servlet 3, async support feature in Spring MVC 3.2 M1 in the context of long-running requests. A second very important motivation for async processing is the need for browsers to receive real-time updates. Examples include chatting in a browser, stock quotes, status updates, live sports results, and Read more…

Overview Spring MVC 3.2 M1 will introduce asynchronous request processing support based on Servlet 3.0. This is the first of several blog posts covering the new feature, providing along the way sufficient background and context to understand how and why you might want to take advantage of it. A major goal of any milestone release Read more…

This post focuses on what's new for Spring MVC in Spring 3.1 M2. Here are the topics: Code-based equivalent for the MVC namespace. Customizable @MVC processing. Programming model improvements. A brief reminder that the features discussed here are in action at the Greenhouse project. Code-based Configuration For Spring MVC As Chris pointed out in his Read more…

In this 5th post of the series describing Spring 3.1 M1 features, I will focus on web applications. In the first half I'll discuss enhancements to the MVC XML namespace. Then I'll show how to create the equivalent of the MVC namespace with all Java configuration. At the end I mention some of the Servlet Read more…

I'm pleased to announce the first milestone of Spring Web Flow 2.2 is now available for download. The release is also available through the Maven milestone repository at http://maven.springframework.org/milestone. As with Spring Web Flow 2.1, this release requires JDK 1.5, Spring 3 and Spring Security 3. The main focus of the release is to address Read more…

In Spring 2.5 it is possible to use annotations to configure all parts of a web application. Seeing annotations applied is particularly interesting in the Web layer where developers traditionally rely on the SimpleFormController and the MultiActionController for form page handling. The introduction of annotations has created a third option, one that does not require Read more…

Load testing a Web Flow application is similar to load testing any other web application – we'll use a load testing tool to simulate increasing levels of concurrent client access in order to capture essential performance statistics. With Web Flow there will be a couple of important considerations for the load test: The load test Read more…