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Simulating CDI’s Session and Request Scope in a J2SE app

java-interview-questions-answers

We’re currently considering refactoring the Naked Objects framework to use JSR-330 (dependency injection) and EE-oriented big brother, JSR-299 (CDI). Using vanilla JSR-330 is a no-brainer, but there are also some nice features in JSR-299 that we’d like to exploit (such as events and decorators). The snag? The Naked Objects must also run transparently in J2SE environments. Now JSR-299 (at least, ...

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Enabling JMX in Hibernate, EhCache, Quartz, DBCP and Spring

Continuing our journey with JMX (see: JMX for human beings) we will learn how to enable JMX support (typically statistics and monitoring capabilities) in some popular frameworks. Most of this information can be found on project’s home pages, but I decided to collect it with few the addition of some useful tips. Hibernate (with Spring support) Exposing Hibernate statistics with ...

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OSGi: An Introduction

OSGi, created for Java-based systems, provides a framework for modular systems. OSGi makes it possible to define the dependencies of each individual module with the others and enables users to control the lifecycle and dynamically change each component of the system. OSGi is a specification and the most common implementations can be counted as Equinox, Apache Felix and Knoplerfish. In ...

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DB unit testing with dbUnit, JSON, HSQLDB and JUnit Rules

In this week’s run of my TDD course, I thought it would be interesting to write a little fixture to make it easier to use dbUnit. My original thought was just to teach dbUnit about JSON, but it turns out that Lieven Doclo has done that already. So I decided to go a step further and also combine dbUnit with ...

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Debugging the JVM

In some (rare) cases you might find yourself in the situation that you managed to crash the JVM itself. I most recently managed this by setting the name of a ThreadGroup to null. In these cases it is useful to debug the JVM itself so that the crash can be located more precisely. Here are the steps to do it ...

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Introducing Deliberate Caching

java-interview-questions-answers

A few weeks ago I attended a ThoughtWorks Technology Radar seminar. I worked at ThoughtWorks for years and think if anyone knows what is trending up and down in software development these guys do. At number 17 in Techniques with a rising arrow is what they called Thoughtful Caching. At drinks with Scott Shaw, I asked him what it meant. ...

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Java 7: Project Coin in code examples

This blog introduces – by code examples – some new Java 7 features summarized under the term Project Coin. The goal of Project Coin is to add a set of small language changes to JDK 7. These changes do simplify the Java language syntax. Less typing, cleaner code, happy developer ;-) Let’s look into that. Prerequisites Install Java 7 SDK ...

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Why I Like The Verbosity of Java

Java is too verbose, they say. You can find comparisons of Hello World programs that take 2 lines in ruby and 10 lines in Java, and in order to read a file you need 20 lines in Java and just 1 in php. Even though the examples are often exaggerated (for example counting imports), it is true Java programs requires ...

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Play framework modules: Divide and conquer

It’s usually the case that you start developing an application and go on fulfilling requirements. When your application grows bigger you start to realize the convenience of separating it into different components. Moreover, when you develop your second or third application, your begin to recognize certain features that could be reused across different applications. These are two good reasons to ...

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