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Write in Ceylon, Deploy as OSGI, use in JEE

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… or how to use Ceylon inside Java EE application servers. The Ceylon language is inherently modular, and is shipped with a complete infrastructure that allows leveraging this modularity out-of-the box. However Ceylon is not captive of its own infrastructure. After the Java and JS interoperability efforts, the 1.1.0 version has brought out-of-the-box compatibility with OSGI, which enables running Ceylon ...

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New Custom Control: TaskProgressView

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I have written a new custom control and commited it to the ControlsFX project. It is a highly specialized control for showing a list of background tasks, their current status and progress. This is actually the first control I have written for ControlsFX just for the fun of it, meaning I do not have a use case for it myself ...

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JPA Tutorial: Mapping Entities – Part 3

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In my last article I showed two different ways to read/write persistent entity state – field and property. When field access mode is used, JPA directly reads the state values from the fields of an entity using reflection. It directly translates the field names into database column names if we do not specify the column names explicitly.  In case of property access mode, ...

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Java And The Sweet Science

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When you have been developing in Java for 15 years and a coworker asks you to help them debug a null pointer exception, you don’t expect to be surprised. Usually it is quite obvious what is null and the only thing you need to do is find out why. Sometimes it is a little more difficult because someone has created ...

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Legacy Code To Testable Code #2: Extract Method

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This post is part of the “Legacy Code to Testable Code” series. In the series we’ll talk about making refactoring steps before writing tests for legacy code, and how they make our life easier. As with renaming, extracting a method helps us understand the code better. If you find it easy to name the method, it makes sense. Otherwise, you ...

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Integration testing done right with Embedded MongoDB

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Introduction Unit testing requires isolating individual components from their dependencies. Dependencies are replaced with mocks, which simulate certain use cases. This way, we can validate the in-test component behavior across various external context scenarios. Web components can be unit tested using mock business logic services. Services can be tested against mock data access repositories. But the data access layer is ...

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Injecting domain objects instead of infrastructure components

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Dependency Injection is a widely used software design pattern in Java (and many other programming languages) that is used to achieve Inversion of Control. It promotes reusability, testability, maintainability and helps building loosely coupled components. Dependency Injection is the de facto standard to wire Java objects together, these days. Various Java Frameworks like Spring or Guice can help implementing Dependency ...

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