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Singleton pattern is one of the most common patterns available and it's also used heavily in Java. This is also one of my favorite interview question and has lots of interesting follow-up to digg into details , this not only check the knowledge of design pattern but also check coding , multithreading aspect which is very important while working for a real life application.

"Contributed and administered by ICEsoft Technologies Inc., ICEpdf.org is a place where enterprise Java developers can learn, share, and contribute information and ideas to a growing community of ICEpdf developers. ICEpdf is an open source Java PDF engine that can render, convert, or extract PDF content within any Java application or on a Web server. ICEpdf.org provides a range of development and support resources to benefit all ICEpdf developers. Source code and application reference implementations are available for download here. Numerous reference implementations and examples are available to enable rapid learning and successful use of the product. The reference implementations are commercial quality implementations that can be deployed as-is, customized to meet specific requirements, or used as learning aids on how to use various features. Visit the ICEpdf demos page to see ICEpdf in action and to evaluate the capabilities of ICEpdf as a Java PDF viewer or deployed as servlet a headless server engine. Remember that ICEpdf is completely customizable and and can be completely embedded in your Java application. We invite you to join the ICEpdf community and to participate in the user forums. The resources available here and on the ICEpdf forums will get you up and developing that much quicker. "

"Quercus is Caucho Technology's 100% Java implementation of PHP 5 released under the Open Source GPL license. Quercus comes with many PHP modules and extensions like PDF, PDO, MySQL, and JSON. Quercus allows for tight integration of Java services with PHP scripts, so using PHP with JMS or Grails is a quick and painless endeavor. With Quercus, PHP applications automatically take advantage of Java application server features just as connection pooling and clustered sessions. Quercus implements PHP 5 and a growing list of PHP extensions including APC, iconv, GD, gettext, JSON, MySQL, Oracle, PDF, and Postgres. Many popular PHP application will run as well as, if not better, than the standard PHP interpreter straight out of the box. The growing list of PHP software certified running on Quercus includes DokuWiki, Drupal, Gallery2, Joomla, Mambo, Mantis, MediaWiki, Phorum, phpBB, phpMyAdmin, PHP-Nuke, Wordpress and XOOPS. Quercus presents a new mixed Java/PHP approach to web applications and services where Java and PHP tightly integrate with each other. PHP applications can choose to use Java libraries and technologies like JMS, EJB, SOA frameworks, Hibernate, and Spring. This revolutionary capability is made possible because 1) PHP code is interpreted/compiled into Java and 2) Quercus and its libraries are written entirely in Java. This architecture allows PHP applications and Java libraries to talk directly with one another at the program level. To facilitate this new Java/PHP architecture, Quercus provides and API and interface to expose Java libraries to PHP. The Quercus .war file can be run on Java application servers such as Glassfish, i.e. it can be run outside of Resin. This .war file includes the Quercus interpreter and the PHP libraries."

Java Topic / Java tutorial Encapsulation is the mechanism that binds together code and the data it manipulates and keeps both safe from outside interference and misuse. Encapsulation is one of the three object oriented concepts.

"Clojure is a dynamic programming language that targets the Java Virtual Machine (and the CLR ). It is designed to be a general-purpose language, combining the approachability and interactive development of a scripting language with an efficient and robust infrastructure for multithreaded programming. Clojure is a compiled language - it compiles directly to JVM bytecode, yet remains completely dynamic. Every feature supported by Clojure is supported at runtime. Clojure provides easy access to the Java frameworks, with optional type hints and type inference, to ensure that calls to Java can avoid reflection. Clojure is a dialect of Lisp, and shares with Lisp the code-as-data philosophy and a powerful macro system. Clojure is predominantly a functional programming language, and features a rich set of immutable, persistent data structures. When mutable state is needed, Clojure offers a software transactional memory system and reactive Agent system that ensure clean, correct, multithreaded designs. I hope you find Clojure's combination of facilities elegant, powerful, practical and fun to use."

Front End Development or Client-Side Development is the practice of coding in technologies like HTML, CSS, and Javascript in a website. The practice involves converting Data into a Graphical Interface for a user to view and interact. Growth in Front-end development is excellent and there are plenteous opportunities available, especially because companies now want their customers to have a good experience while using their Web applications. Want to get hired as a Front End Developer in 2019? Acquire skills in Front End Development, Build live Projects and Get Guaranteed Interviews with edWisor.

It is an open-source testing framework for java programmers. The java programmer can create test cases and test his/her own code. It is one of the unit testing framework. Current version is junit4. To perform unit testing, we need to create test cases.

The default EMF UML2 repository implementation was changed from UML2 1.x to UML2 2.x, in order to support the most current versions of the MagicDraw and Rational tools. Due to conflicting dependencies in the uml libraries, both implementations could not be supported at the same time.

t just works - Migrate from any version (incl. an empty database) to the latest version of the schema Automatic migration on startup - Ship migrations together with the application and run them automatically on startup Convention Over Configuration - Classpath Scanning to automatically discover Sql and Java migrations Plain Old Sql - SQL scripts for regular migrations (incl. placeholder replacement). No proprietary XML formats, no lock-in. No limits - Java classes for advanced migrations Highly reliable - Safe for cluster environments (Multiple machines can migrate in parallel) Maven support - Maven plugin for migrating manually Fail fast - Inconsistent database or failed migration prevents app from starting. Schema Clean - Drop all tables, views, triggers, ... from a schema without dropping the schema itself

"At this point, the only source of useful overview documentation for the Common Navigator are the excellent tutorials at Michael Elder's (the author of the CN) blog. Soon I hope to get some of this transferred into the Eclipse Plugin Developer's Guide. RCP applications can quickly and easily use the CN to show the resources in the workspace. This assumes that your RCP application uses resources (which is another discussion). The CN can also be used for non-resource RCP applications, in that case, these instructions don't apply, as the objects treated by the CN have to be created directly by the RCP application. If you are planning to use the CN in an RCP application that uses resources, there are 3 (2 of which are completely undocumented) things you must do:"

"Learn how to use EMF.Edit and Common Navigator Framework (CNF) to create a model navigation plug-in based on a tree viewer. Build an Eclipse plug-in that allows users to manipulate and navigate the content of an Eclipse Modeling Framework (EMF)-based model. This will involve step-by-step guidance of developing the plug-in, implementing the proper structures to extract the model content through the EMF edit framework, and displaying the content in a CNF-based view part."

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

"Morphia is a lightweight type-safe library for mapping Java objects to/from MongoDB: Easy to use, and very lightweight; reflection is used once per type and cached for good performance. Datastore and DAO access abstractions, or roll your own... Type-safe, and Fluent Query support with (runtime) validation Annotations based mapping behavior; there are no XML files. Extensions: Validation (jsr303), and SLF4J Logging"

"Scalaz is a library written in the Scala Programming Language. The intention of Scalaz is to include general functions that are not currently available in the core Scala API. The scalaz-core module depends only on the core Scala API and the core Java 2 Standard Edition API. Scalaz is released under a BSD open source licence making it compatible with the licence of the Scala project. Scalaz 6.0.1 was released in June 2011, targeting Scala 2.8.1 and 2.9.0.1. "

"The Open Data Protocol (OData) is a Web protocol for querying and updating data that provides a way to unlock this data and free it from silos that exist in applications today. OData does this by applying and building upon Web technologies such as HTTP, Atom Publishing Protocol (AtomPub) and JSON to provide access to information from a variety of applications, services, and stores. Project Info odata4j is a new open-source toolkit for building first-class OData producers and first-class OData consumers in Java. "

"Eclipse Plug-in for tailing log files and eclipse consoles (e.g. SVN, Java Stack Trace, CDT), including syntax coloring with either a regular expression or a word match. It allows you to have multiple logs open concurrently. "

" Xtext has been released as a part of the Eclipse Galileo release train on June 24th, 2009. Xtext is a framework for building DLSs (domain specific languages). In fact, it can be seen as a DSL for defining DSLs. In this article, we will develop a small DSL for defining entities."

"This release brings some brand new features in GWT Application development Java API for Adobe Flex (AIR and Browser) More then 500 rich UI Compoments for your application ( http://www.gwt4air.appspot.com/) Client side file processing. Specially PDF and Excel Easy integration with your existing GWT application. Because the project is based on GWT, no need of a middleware to connect the Flex UI to the backend "

Scala is a general purpose programming language designed to express common programming patterns in a concise, elegant, and type-safe way. It smoothly integrates features of object-oriented and functional languages. It is also fully interoperable with Java