Sunday, April 15, 2007

Introduction to Java Persistence API(JPA)

Java Persistence API (JPA) provides POJO (Plain Old Java Object) standard and object relational mapping (OR mapping) for data persistence among applications. Persistence, which deals with storing and retrieving of application data, can now be programmed with Java Persistence API starting from EJB 3.0 as a result of JSR 220. This API has borrowed many of the concepts and standards from leading persistence frameworks like Toplink (from Oracle) and Hibernate (from JBoss). One of the great benefits of JPA is that it is an independent API and can nicely integrate with J2EE as well as J2SE applications.More>>

Report Reveals AJAX on the Rise

There are now 3.5 million AJAX developers worldwide, a 50 percent increase over the past year, based on results of a survey that will be released next week.

The survey, conducted by Santa Cruz, Calif.-based Evans Data Corp., will also reveal that nearly four out of five, or 78 percent, of AJAX applications are developed for the Web and nearly 40 percent are for server-centric applications such as databases, ERP, CRM, as well as rich Internet applications.More>>

Tuesday, April 03, 2007

What is new in Java 6.0 Collections API?

In this article Vidua Sagar will write about the new Collections APIs introduced in Java 6.0. Mustang has few interesting changes in the Collections APIs, one amoung them is the Deque. Deque is used for the Bi-Directional traversal. It has different implementations including BlockingDeque,ArrayDeque,etc. He will talk about the Deque and its various implementation, also few more changes in the Collectiona API in Java 6.0.More>>

The Java 6.0 Compiler API

One of the cool features available in Java 6.0 (Mustang) is the ‘Java Compiler API’. This API is a result of the JSR (Java Specification Request) 199 which proposes that there must be a standard way to compile java source files. The result of the JSR is the new ‘Java Compiler API’ and one can use this new feature to compile java source files from within java files. Previously developers were depending on the low-level issues like starting a process representing the javac.exe. Though this feature is not intended to every one, Editors or IDE (Integrated Development Environment) can make much use of this new feature for compiling Java source files in a better manner.More>>

EJB 3.0 Timer Services - Timer Services API

Starting from EJB 2.1, Timer Services are available for building J2EE Applications that depends on time based services. Time based services are mostly used in scheduling applications. Technically, these scheduling applications are called workflows. A workflow defines a configurable sequence of activities or tasks that will take place at a particular point of time. Before EJB 2.1, one has to manually code for building and deploying time-based workflow systems. But, with the invent of EJB 3.0, thanks to Annotations and Dependency injections, life has become still more easier for creating such applications.More>>