Until recently, if you decided to use JSR-303 validations on a project, the choice of what implementation to use was an easy one: Hibernate Validator was the reference implementation and the only one that passed the TCK to ensure its correct behavior. But on the 11th of June the Apache BeanValidation team released a version of its validator that passes the TCK, providing a new compliant implementation and giving more choice to the end users.

I recently came across the need of adding the ability of executing asynchronous tasks in a project. The project in question had these needs:

The recently approved Bean Validation Standard (JSR-303) left one great (and requested) feature out of the specification: method validation. This proposal defined an additional API for the Validator with methods that allowed validation of method/constructor parameters as well as the return value of methods. Thankfully, even though this spec didn’t make it to the final approved document, all constraint annotations accept parameter as target, so the door was left open for it to be implemented as an extra feature.
methodvalidation.tar

I have recently started using mockito to improve the quality of my unit tests. It’s a great tool, with a very clear syntax that makes tests very readable. Also, if you follow a BDD pattern in your tests, mockito has aliases in BDDMockito so that your actions can clearly follow the given/then/when template.

In this entry I will show a way to integrate the new JSR 303 bean validation standard with Wicket 1.4. The resulting example form will have AJAX callbacks to inform the user promptly about validation errors and these messages will be internationalized according to the locale associated with the user’s session. Spring 3 will be used to manage the Validator instance.

Following the post explaining a layered arquitecture with Spring and Hibernate, this entry will explain how to easily test its DAOs and Service components using Spring’s TestNG integration.

In this post you will learn one of the ways to create a layered data driven application using Hibernate and Spring 3. The architecture will go up from the database to the service layer, so it’s your choice how to do the presentation part. I will try to adhere to Spring’s best practices in the separation of layers, so the resulting architecture offers both a clear separation between the layers and little dependencies in the Spring framework.

It’s all over the Internet today, Google has released a new programming language called Go. As of what I have been able to see so far, Go can be described as a systems language which aims to leverage Python’s expressiveness into the grounds of compiled languages as C++. Also, Go is both fast to compile and to execute. You can see some pretty impressive footage of Go’s compiler speed in this video.

This is the first chapter of a mini-guide that will try first to set clear what the purpose of Apache Maven is, and then show you how you can use it in your Java projects.