Validations are a huge part of any software development. We need to validate that the data being entered from the UI is correct i.e of correct type or we are not leaving a notNull/notEmpty fields to be blank. There are so many ways to fulfill these requirements and we can have UI level validations or persistence level validations.

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Tags: Ajax, Hibernate Validation, JSF, Seam
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I was introduced to OSGi quite by coincidence. I had to give a presentation and a colleague suggested to look into OSGi. And once I started looking into it, I was quite surprised to find the ease with which it provided the solutions to some of the problems that we face in the web application development. There are so many good articles and blogs which provide a great amount of material regarding OSGi. They are mentioned in the reference.

One of the concepts of OSGi that really intrigued me was how it allows bundles to export services that can be consumed by other bundles without knowing anything about the exporting bundle. OSGi takes care of this by introducing Service Registry where the exporting bundle registers the interfaces that it want to expose and any other bundle which wants to use those interface can just look up in the registry to use the implementation. The other concept of OSGi which I also found interesting was how OSGi uses version management to allow different versions of the same java class to be used within the project. So I created this blog to explore these concepts in greater detail. At this point, it would be important to mention that the intended audience for this blog are people who are new to OSGi. Also the example used are very basic and intend to show just the flow of control from one package to another.

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