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OSGI – Modularizing your application

Since I am a big proponent of modularity, low coupling, high cohesion, etc … I believe that this technology is a breakthrough in how we create applications using the Java platform. With OSGi, it is very simple to create highly extensible applications, see for example the Eclipse IDE. My goal here is not to show in depth how the technology ...

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Key Success Factors for Open Source Strategies

Last week at EclipseCon Europe, John Swainson gave a keynote address that reflected on IBM’s decision to start Eclipse as an open source project and consortium. During his speech, John identified 5 key things IBM thought they needed to be successful. These success factors are still relevant today for any company interested in an open source strategy, so I think ...

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JMeter: Load Testing Relational Databases

Apache JMeter is a performance testing tool which is entirely written in Java. Any application that works on request/response model can be load tested with JMeter. A relational database is not an exception: receives sql queries, executes them and returns the results of the execution. I’am going to show you how easy it is to set up test scenarios with ...

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Hibernate Tip: Sort and Order

Let’s introduce another hibernate performance tip. Do you remember the model of previous hibernate post? We had a starship and officer related with a one to many association.                 @Entity public class Starship { @Id @GeneratedValue(strategy=GenerationType.SEQUENCE) private Long id; public Long getId() {return id;} protected void setId(Long id) {this.id = id;} @OneToMany(mappedBy="starship", cascade={CascadeType.ALL}) ...

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Java Swing to Android

Here is a quick, brief 10,000ft overview/observations on Android from a Swing developers point of view. Firstly if your coming to Android from Swing you are approaching it with a big advantage to J2EE developers. Now I realise Android doesn’t actually have the AWT/Swing API’s but that doesn’t matter as the general front end/event driven mechanism in it is so ...

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Integrating Spring & JavaServer Faces : Improved Templating

With the release of version 2.0 Facelet templating became a core part of the JSF specification. Using <ui:composition> and <ui:decorate> tags it becomes pretty easy to build up complicated pages whilst still keeping your mark-up clean. Templates are particularly useful when creating HTML forms but, unfortunately, do tend to cause repetition in your xhtml files, breaking the DRY (Don’t Repeat ...

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Java Concurrency with ReadWriteLock

Writing multithreaded java applications is not a piece of cake. Extra care must be taken because bad synchronization can bring your application to its knees. The JVM heap is shared by all the threads. If multiple threads need to use the same objects or static class variables concurrently, thread access to shared data must be carefuly managed. Since version 1.5, ...

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JSON with GSON and abstract classes

I have switched to Google Gson after many years of using org.json library for supporting JSON data interchange format in Java. org.json is a lower-level library, so that you have to create JSONObject, JSONArray, JSONString, … and do other low-level work. Gson simplifies this work. It provides simple toJson() and fromJson() methods to convert arbitrary Java objects to JSON and ...

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Why Developers Keep Making Bad Technology Choices

Today, software developers are faced with a great abundance of options when choosing how to design and implement systems. We are constantly bombarded with choice and are used to dealing with buzzwords like NoSQL, the cloud, REST, Map-Reduce and so on. However, developers in charge of designing systems can be easily seduced into incorporating technologies that don’t provide a clear ...

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