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Tag Archives: Spring

Spring MVC Custom Validation Annotations

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Last tutorial, I showed how to validate a form using annotations. This works great for simple validations, but eventually, you’ll need to validate some custom rules that aren’t available in the out-of-the-box annotations. For example, what if you need to validate that a user is over 21 years old, calculated based off their input birthdate, or, maybe you need to ...

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Auditing a Spring MVC Webapp with AspectJ. Part 2

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Now, this is the blog you want to read if you’re interested in creating a Spring MVC Webapp that uses Aspect Oriented Programming (AOP) in the form of Aspectj’s @Aspect and @Before annotations to audit a user’s visit to a screen. As I said in my last blog auditing a user’s visits to a screen is one of those few ...

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su and sudo in Spring Security applications

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Long time ago I worked on a project that had a quite powerful feature. There were two roles: user and supervisor. Supervisor could change any document in the system in any way while users were much more limited to workflow constraints. When a normal user had some issue with the document currently being edited and stored in HTTP session, supervisor ...

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Unit Testing of Spring MVC Controllers: Configuration

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Writing unit tests for Spring MVC controllers has traditionally been both simple and problematic. Although it is pretty simple to write unit tests which invoke controller methods, the problem is that those unit tests are not comprehensive enough. For example, we cannot test controller mappings, validation and exception handling just by invoking the tested controller method. Spring MVC Test solved ...

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Auditing a Spring MVC Webapp with AspectJ. Part 1

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If you’re like me, then you’ll have those kinds of programming days where everything seems to go incredibly well. You write the code and the tests and it just works. And then and there are those other kinds of days, the really bad ones, where you know that everything you’ve written is as right as it can be and the ...

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Spring from the Trenches: Using Environment Specific Cron Expressions with the @Scheduled Annotation

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The @Scheduled annotation offers an easy way to create scheduled tasks in Spring powered applications. We can use it to schedule our tasks by using either periodic scheduling or cron expressions. Although period scheduling can also be useful, the cron expressions give us much more control over the invocation of the scheduled tasks. That is why they are very useful ...

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Spring JTA multiple resource transactions in Tomcat with Atomikos example

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In this tutorial we shall show you how to implement JTA multiple resource transactions in a Tomcat server, using Atomikos Transaction Manager. Atomicos transaction manager provides support for distributed transactions. These are multi-phased transactions, often using multiple databases, that must be committed in a coordinated way. The distributed transactions are described by the XA standard. XA governs how a transaction ...

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Spring MVC Error handling flow

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There are broadly three ways of handling an exception flow using Spring MVC, the objective being to intercept any application exception and present a friendly and informative view back to the user. 1. Using error-page tag in web.xml file: This is a servlet specs driven approach, where the exceptions that bubble up from the application are intercepted based on either ...

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The Biggest Flaw of Spring Web Applications

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The developers who are using Spring Framework in their applications are good to talk about the benefits of dependency injection. Unfortunately, they are not so good to leverage its benefits such as the single responsible principle and separation of concerns in their applications. If we take a look at any Spring powered web application, the odds are that the application ...

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