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There is the list of 170 core java interview questions. If there is any core java interview question that have been asked to you, kindly post it in the ask question section. We assure that you will get here the 90% frequently asked interview questions and answers.

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Google provides a scalable application hosting environment called Google App Engine (GAE). One of the many benefits of GAE is that hosting small scale applications is 100% free. Google starts charging for hosting when your application resource requirements start to grow.

"I've had an opportunity recently to work on a product that needed an RIA web interface, and I chose my recent favorite tool for this, Vaadin. The services for this project needed to be highly scalable, and lent themselves well to functional techniques, so I selected Scala as my language of choice. I build my projects with Maven, for reasons I won't go into right now, and I do much of my JVM-language work in Intellij's excellent IDEA IDE. Given these tools, I found a way to facilitate very rapid development of web UI's, and I thought I'd pass it along. Another technique I use, which I'll expound on later, is creating "dummy" implementations of all of my backing services for my application. The "real" implementations are written as OSGi services, in separate modules from my UI. The UI is packaged as a war, but is also OSGi aware, with a bundle activator. This activator only gets called if the war is deployed into an OSGi container, and not otherwise. This allows the app to select which implementation of the services it uses - the "dummy" ones when it's deployed outside of OSGi, and the "real" ones when they're available. This means I can use the handy Maven jetty plugin to quickly spin up my application and test it on my local workstation, without needing all of the dependencies (like a data store and such) of my real services. That's good, in that I can get my "cycle time" down to a few seconds, where "cycle time" is the time between making a change and actually being able to test it in my browser. We can do better, though. I'm using Scala as my language of choice for building the UI as well, as it works just fine with Vaadin (and with everything else in the JVM ecosystem, for that matter, which is why I didn't choose a non-JVM language - but that's yet another rant). I compile my Scala with the Maven scala plugin - here's where the next handy bit comes into play. Turns out the Scala plugin has a goal cal

The aim of this paper is a brief introduction to MDA technology and a summary / comparison to the approachments to MDA of AndroMDA and Acceleo, intending to be a practical and understandable summary Introduction Model-driven architecture (MDA) is a software design approach for the development of software systems. It provides a set of guidelines for the structuring of specifications, which are expressed as models. It was launched by the Object Management Group (OMG) in 2001 The Model-Driven Architecture approach defines system functionality using a platform-independent model (PIM) using an appropriate domain-specific language (DSL). One of the main aims of the MDA is to separate design from architecture. As the concepts and technologies used to realize designs and the concepts and technologies used to realize architectures have changed at their own pace, decoupling them allows system developers to choose from the best and most fitting in both domains. The design addresses the functional (use case) requirements while architecture provides the infrastructure through which non-functional requirements like scalability, reliability and performance are realized. MDA envisages that the platform independent model (PIM), which represents a conceptual design realizing the functional requirements, will survive changes in realization technologies and software architectures.

The Fornax-Platform is a development platform for tools related to the Model-Driven-Software-Development - MDSD. In this context tools are cartridges, transforms, ready-to-use generators or simple enhancements to make it easier to work in a MDSD environment. Another approach is to provide Howto's and tutorials that simplify the undestanding of MDSD. The Fornax-Platform provides infrastructure and tools to simplify the management and the development of such components and tools. It is independent from companies in this area of software development.

Remus Information Management. It is a free OpenSource client application for the management of information with a connection to multitude of data repositories and a desktop-integration for an optimal usage for the offline management, visualization and easy accessibility of information to the user. The biggest efforts are the linking of information throughout different repositories, the offline storage, the clean representation and the fast search through the information.

This tutorial covers adding validations to forms during submission using Validator interface from Spring. This is part of the Spring MVC tutorial series.

A tutorial on how to create a web application using basic Spring MVC from spring-framework 3.0.5. We will design our web-based application based on the standard Spring MVC where request to the web-app will be routed to a Controller module, then to it's jsp View with data from our business Model

COPE, a tool based on EMF that eases the migration of models in response to an evolving metamodel. COPE explicitly records the history of the metamodel as a sequence of changes and allows to attach information of how to migrate models (which is referred to as coupled evolution). The attached information can be used to automatically migrate models to the new version of the metamodel. COPE even goes one step further and allows to reuse combinations of metamodel adaptation and model migration steps across metamodels.

The CDO (Connected Data Objects) Model Repository is a distributed shared model framework for EMF models and meta models. CDO is also a model runtime environment with a focus on orthogonal aspects like model scalability, transactionality, persistence, distribution, queries and more. CDO has a 3-tier architecture supporting EMF-based client applications, featuring a central model repository server and leveraging different types of pluggable data storage back-ends like relational databases, object databases and file systems. The default client/server communication protocol is implemented with the Net4j Signalling Platform.

WindowBuilder Pro (also known as just WindowBuilder) is a powerful and easy to use bi-directional Java GUI designer. It is composed of SWT Designer, Swing Designer and GWT Designer and makes it very easy to create Java GUI applications without spending a lot of time writing code to display simple forms. With WindowBuilder Pro you can create complicated windows in minutes. Use the visual designer and Java code will be generated for you. You can easily add controls using drag-and-drop, add event handlers to your controls, change various properties of controls using a property editor, internationalize your app and much more.

"Essential is a project to create a workbench for applying Model Driven Development (MDD). The workbench allows to experiment with models, metamodels, templates and transformations in an integrated environment. The main focus is to provide a declarative environment oriented to prototyping and evolving custom DSL and MDD tools in a quick and clean way. Motivation for a new tool Essential.Meta. DSL for Metamodelling Modelling with Essential StringTemplate, the template engine"

"EMF URI handler implementation that can persist EMF object instances to MongoDB. "

redview.org: Riena EMF Dynamic Views for Business Applications and more

Great website for begginers in java (and not only). It goes from the very beginning to intermediate topics and simple game development.

"Short screencasts that outlines features of applause, a domain-specific language (DSL) and code generator to produce native apps for iPhone, Android and BlackBerry. You can find this open-source project at code.google.com/​p/​applause"

"Let's imagine we want to create an application for orders. People can sign in to the system, place orders for various items, check out and have them sent to their address. Very simple, but we can show a lot of things here. As we expect to be writing more than one application of this type and as we also would like to be able to express the structure of the application on a business level (one of the major drivers for DSLs and MDSD for that matter), we come up with the idea of using a DSL to describe what the application does. Defining the DSL is what we did last week. This week, we need to map the concepts of the DSL to some code and some APIs we're going to program against. So, we're going to create a set of code templates for a code generator that can then read our DSL models and create persistence code for us."

" Over the past few years, and actually the past year, a lot of new initiatives have surfaced in the area of creating so called language workbenches - aiming at facilitating the definition and use of DSLs and code generation. We believe each of these has its own strengths and weaknesses, and none is 'the best' for every purpose. Still, a lot of people keep asking for the best workbench. Based on that, we are now planning to have a Language Workbench Competition, in which we will be able to compare the strengths and weaknesses of these workbenches based on solutions for a predefined set of cases. Keep an eye on this page for more details in the coming, as the cases are being defined and the possibilities of co-hosting this initative at Code Generation 2011 in Cambridge are being investigated."

The NumberFormatException is thrown when we try to convert a string into a numeric value such as float or integer, but the format of the input string is not appropriate or illegal.