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Eclipse Gemini Blueprint is the reference implementation for the OSGi Alliance Blueprint Service (chapter 121 of the OSGi 4.2 Compendium Specification). Gemini Blueprint project makes it easy to build Java applications that run in an OSGi framework. By using Gemini Blueprint, applications benefit from using a better separation of modules, the ability to dynamically add, remove, and update modules in a running system, the ability to deploy multiple versions of a module simultaneously (and have clients automatically bind to the appropriate one), and a dynamic service model. Gemini users may also be interested in Eclipse Virgo, an open source, completely modular, OSGi-based Java application server. Its documentation is considered a supplement to Gemini Blueprint as it explains in detail, how OSGi can be used in various development and production scenarios.

iPOJO is a service component runtime aiming to simplify OSGi application development. It natively supports ALL the dynamism of OSGi. Based on the concept of POJO, application logic is developed easily. Non-functional properties are just injected in the component at runtime. iPOJO strength points are : components are developed as POJO, nothing else is required ! the component model is extensible, so feel free to adapt it to your needs the standard component model manages service providing and service dependencies, and so can require any other OSGi services iPOJO manages the component instance lifecycle and the environment dynamics as it has never been possible iPOJO provides a powerful composition system to create highly dynamic applications iPOJO supports annotations, XML or Java-based API to define the component

Inter Thread Communication is one of the distinct facility in multi threading application development of java. In real world Inter Thread communication based applications of java works faster when compared to all the other applications in java. Inter-thread communication is all about making synchronized threads communicate with each other. It is a mechanism in which a thread is paused running in its critical section and another thread is allowed to enter in the same critical section to be executed. It is implemented by following methods of Object class wait() : Tells the calling thread to give up monitor and go to sleep until some other thread enters the same monitor and call notify. Causes current thread to release the lock and wait until either another thread invokes the notify() method or the notifyAll() method for this object, or a specified amount of time has elapsed. The current thread must own this object's monitor.

AspectJ is an aspect-oriented extension created at PARC for the Java programming language. It is available in Eclipse Foundation open-source projects, both stand-alone and integrated into Eclipse. AspectJ has become the widely used de-facto standard for AOP by emphasizing simplicity and usability for end users. It uses Java-like syntax and has included IDE integrations for displaying crosscutting structure since its initial public release in 2001. In this article we will describe how we can use AspectJ to do the logging job for all methods parameters and methods return values in a Java application

Writing your own logging framework is the perfect coding crime. If you can convince your manager to put it on the project plan, you are guaranteed to have success. At the end of each day, you will go home feeling happy and satisfied. It will feel like you are doing something creative. You will get the intellectual stimulation without the risk of failure. Even the Sun engineers fell into this trap. Prior to Java 4, we had a perfectly good logging framework in Log4J. However, instead of adopting this into the standard Java distribution, we ended up with java.util.logging. There are lots of Java logging frameworks available, even meta-logging frameworks like SLF4J and Jakarta Commons. These are supposed to abstract the logging frameworks so you can change the implementation without touching your code. http://www.javaspecialists.eu/archive/Issue177.html

Does it all make sense now? Do you know how to solve every problem? Probably not, but when it comes right down to it, using Java EE can be even simpler than using Spring, and take much less time. You just have to find the right guides and the right documentation (which is admittedly a severe sore-spot of Java EE; the documentation is still a work in progress, but is getting much better, save blogs like this one.) You have to turn to a vendor like JBoss, or IBM in order to get the use-case driven documentation you need, and they do have documentation, it's just a matter of finding it. Seam 3 in particular strives to give extensive user-documentation, hopefully making things much simpler to adopt, and easier to extend. The main purpose of this article was not to bash Spring, although I may have taken that tone on occasion just for contrast and a little bit of fun. Both Spring and Java EE are strongly engineered and have strong foundations in practical use, but if you want a clean programming experience right out of the box - use Java EE 6 on JBoss Application Server 6 - JBoss Tools - and Eclipse. I will say, though, that the feeling I've gotten from the Spring forums vs the Java EE forums, is that there are far many more people willing to help you work through Java EE issues, and more available developers of the frameworks themselves to actually help you than there are on the Spring side. The community for Java EE is much larger, and much more supportive (from my personal experience.) In the end, I did get my application migrated successfully, and despite these issues (from which I learned a great deal,) I am still happy with Java EE, and would not go back to Spring! But I do look forward to further enhancements from the JBoss Seam project, which continue to make developing for Java EE simpler and more fun. Don't believe me? Try it out. Find something wrong? Tell me. Want more? Let me know what you want to hear.

http://www.manageit.me ---The greatest minds in IT in 50+ presentations : top industry-leaders: Creator of MySQL Michael "Monty" Widenius, Internet Celebrity Gary Vaynerchuk, Co-Creator of PHP & Zend CTO Zeev Suraski, Richard Sheridan, CEO of Menlo Innovations & Pioneer of Agile eXtreme Programmi...

Lucene is an Open Source, mature and high-performance Java search engine. It is highly flexible, and scalable from hundreds to millions of documents. Luke is a handy development and diagnostic tool, which accesses already existing Lucene indexes and allows you to display and modify their content in several ways: * browse by document number, or by term * view documents / copy to clipboard * retrieve a ranked list of most frequent terms * execute a search, and browse the results * analyze search results * selectively delete documents from the index * reconstruct the original document fields, edit them and re-insert to the index * optimize indexes * and much more... Recent versions of Luke are also extensible through plugins and scripting. I started this project because I needed a tool like this. I decided to distribute it under Open Source license to express my gratitude to the Lucene team for creating such a high-quality product. Lucene is one of the landmark proofs that Open Source paradigm can result in high-quality and free products.

SmartSprites will let you easily introduce and maintain CSS sprites in your designs. SmartSprites parses special directives you can insert into your original CSS to mark individual images to be turned into sprites. It then builds sprite images from the collected images and automatically inserts the required CSS properties into your style sheet, so that the sprites are used instead of the individual images. SmartSprites parses special directives you can insert into your original CSS to mark individual images to be turned into sprites. It then builds sprite images from the collected images and automatically inserts the required CSS properties to your style sheet, so that the sprites are used instead of the individual images. In other words, no tedious copying & pasting to your CSS when adding, removing or changing sprited images. Just work with your CSS and original images as usual and have SmartSprites automatically transform them to the sprite-powered version when necessary.

"There are pros and cons for considering validation as business logic, and Spring offers a design for validation (and data binding) that does not exclude either one of them. Specifically validation should not be tied to the web tier, should be easy to localize and it should be possible to plug in any validator available. Considering the above, Spring has come up with a Validator interface that is both basic ands eminently usable in every layer of an application. Data binding is useful for allowing user input to be dynamically bound to the domain model of an application (or whatever objects you use to process user input). Spring provides the so-called DataBinder to do exactly that. The Validator and the DataBinder make up the validation package, which is primarily used in but not limited to the MVC framework. The BeanWrapper is a fundamental concept in the Spring Framework and is used in a lot of places. However, you probably will not have the need to use the BeanWrapper directly. Because this is reference documentation however, we felt that some explanation might be in order. We will explain the BeanWrapper in this chapter since, if you were going to use it at all, you would most likely do so when trying to bind data to objects. Spring's DataBinder and the lower-level BeanWrapper both use PropertyEditors to parse and format property values. The PropertyEditor concept is part of the JavaBeans specification, and is also explained in this chapter. Spring 3 introduces a "core.convert" package that provides a general type conversion facility, as well as a higher-level "format" package for formatting UI field values. These new packages may be used as simpler alternatives to PropertyEditors, and will also be discussed in this chapter."

"JAnnocessor is a new open-source framework for powerful, flexible, yet easy processing of annotated Java code. Its main purpose is compile-time, annotation-driven source code generation in a declarative and customizable fashion. JAnnocessor is built on top of Java APT, encapsulating the Java source code model in a rich and convenient high-level domain model that serves as a good target for expressive matching and transformation. Finally, a template engine is used for customizable template-based source code generation. Having simplicity and productivity in mind, JAnnocessor has many useful features that make it enjoyable: smart imports organization, logging delegation, graphical UI for real-time debug, hot swap of processors and templates, as well as out-of-the-box common annotations, processors and templates."

The covariant return type specifies that the return type may vary in the same direction as the subclass. Before Java5, it was not possible to override any method by changing the return type. But now, since Java5, it is possible to override method by changing the return type if subclass overrides any method whose return type is Non-Primitive but it changes its return type to subclass type.

"Stop using Tomcat and wondering why JEE "doesn't work." You're doing yourself a big disservice. Start thinking about JBoss AS 6, or GlassFish v3 - Yes, I know, it's a "Full JEE Container," - it's "Heavy," but with JEE6, that's not a bad thing: It all "Just works" and it works really well. Trust me, the reason people have thought Java EE sucks, is because they try to do this stuff on Tomcat, and say "Why doesn't (JPA, JMS, JTA, EJB, JSF, CDI) work?" Well… that's because Tomcat only gives you Servlet - the Request/Response lifecycle. So people install all these things manually, or try to, and then say, "Wow, Java EE is really hard to use, shit, I'm gonna use Spring or Grails instead.""

From a technical standpoint Ext GWT and SmartGWT are quite equal apart from the fact that Smart has more to offer on the server side. Vaadin with its complete different apprach (not from the programming style but from runtime behavior) needs to be compared in a different fashion. Things like GUI responsiveness and overall performance must be carefully checked. But on the pro side you have a very small js client with vaadin which results in fast startup in the browser. On the other hand, our product is a business product and we are planing to rewrite the AdminConsole. This is something that will be used in intranets in 95% of the time. It doesnt make much of a differnece if you load 100k or 1Mb from inside the LAN.

Database Change Management You never develop code without version control, why do you develop your database without it? Liquibase is an open source (Apache 2.0 Licensed), database-independent library for tracking, managing and applying database changes. It is built on a simple premise: All database changes are stored in a human readable yet trackable form and checked into source control. Liquibase Supports: Extensibility Merging changes from multiple developers Code branches Multiple Databases Managing production data as well as various test datasets Cluster-safe database upgrades Automated updates or generation of SQL scripts that can be approved and applied by a DBA Update rollbacks Database "diff"s Generating starting change logs from existing database

" Jump to: navigation, search Welcome to our Wiki. This is the Wiki home page for the Buckminster Component Assembly project, an Eclipse Tools sub project. Buckminster is a component resolution & materialization framework. Its purpose is to get software components for you and materialize them in a context of choice, typically a workspace or file system. This applies whether you are looking at what's available on your local machine, within your development organization or in the public open source cloud. Buckminster reuses existing investments in a wide range of build and source management tools - Maven, ANT, CVS, SVN, PDE, etc. It removes ambiguity from component descriptions, enables component sharing and increases productiveness when applied in development, build, assembly and deploy scenarios. "