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Journey to idempotency and temporal decoupling

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Idempotency in HTTP means that the same request can be performed multiple times with the same effect as if it was executed just once. If you replace current state of some resource with new one, no matter how many times you do so, in the end state will be the same as if you did it just once. To give ...

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Working with sass scripts in Grails 2.3.X

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Sass is one of the most mature, stable, and powerful professional grade CSS extension language available. Before we can use Sass, we need to set it up on our project. In grails-2.4.X, it is very easy to use sass through asset pipeline plugin. But with grails-2.3.x version, we need to follow these steps: Step 1 Install Ruby with RVM:   ...

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In today’s post-OO world, is dependency injection still relevant?

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It’s 2015. Most of the new popular languages are more or less functional. The old ones, like Java, gain functional programming elements. In Scala, people are increasingly leaning towards the pure side, using more FP and less OO. So – Dependency Injection? Really? You could say that DI is just using (constructor) parameters. I’m saying that as well in my ...

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Joining Strings in JDK 8

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JDK 8 introduced language features such as lambda expressions, streams, and even the new Date/Time API that will change the way we write Java applications. However, there are also several new APIs and features that might be less “game changing,” but still bring greater convenience and expressiveness to the Java programming language. In this post, I look at one of ...

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Do Primitives Need To Go?

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I am currently working on an enterprise application using JSF as the view technology and JPA for the persistence layer. It may have been something in a backing bean or service method, but it struck me: Is there a good reason to use primitives anymore in enterprise applications? When I started programming with Java around J2SE 1.2 (or was it ...

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Very fast Camels and Cloud Messaging

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Apache Camel is a popular, mature, open-source integration library. It implements the Enterprise Integration Patterns which is a set of patterns that often come up when integrating distributed systems. I’ve written a lot about Camel in the past, including why I like it better than Spring Integration, how the routing engine works, how to use JMS selectors with AWS SQS, ...

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Hibernate Locking Patterns – How does PESSIMISTIC_READ and PESSIMISTIC_WRITE work

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Introduction Java Persistence API comes with a thorough concurrency control mechanism, supporting both implicit and explicit locking. The implicit locking mechanism is straightforward and it relies on: Optimistic locking: Entity state changes can trigger a version incrementation Row-level locking: Based on the current running transaction isolation level, the INSERT/UPDATE/DELETE statements may acquire exclusive row locks While implicit locking is suitable ...

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Fetching List of message codes from message.properties

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Normally messages from message properties are fetched via, key i.e. message code, What if we want to select more than one message property, like a list. To get a list of select message codes from message.properties, we need to customize messageSource bean. To do that, lets create a class ‘CustomisedPluginAwareResourceBundleMessageSource’ which should extend class ‘PluginAwareResourceBundleMessageSource’. To fetch all properties we ...

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Thoughts about TDD and how to use it for untested legacy code

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Prologue My personal experiences with TDD mostly match with the others on the internet, in short, TDD is good. It helps you to write better code, create a clean and nicely tested architecture, make refactoring and design changes easier. It leads your design decisions, helps to think through every possible cases which you need to handle and many more. I ...

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