JBoss Seam: Web 2.0 Applications

JBoss Seam is a powerful new application framework developed by JBoss, a division of Red Hat for building next generation Web 2.0 applications. It unifies and integrates technologies such as Asynchronous JavaScript and XML (AJAX), Java Server Faces (JSF), Enterprise Java Beans (EJB3), Java Portlets and Business Process Management (BPM) into a single unit i.e. SeamSeam is designed from the ground, up to eliminate the complexities at the architecture and the API level. It enables developers to assemble complex web applications with simple annotated Plain Old Java Objects (POJOs), componentized UI widgets and very little XML. The simplicity of Seam 1.0 will enable easy integration with the JBoss Enterprise Service Bus (ESB) and Java Business Integration (JBI) in the future.

Previously, creating J2EE 1.4 applications, especially those involving web-based user interface and back-end EJBs, required a lot of tedious coding. Now JEE 5 and EJB 3, with their focus on lightweight Java support, have planned to reduce the code bloat for the developers. However the specifications for JEE 5 along with EJB3 are still not yet finalized, there is already a framework available i.e. JBoss Seam, this framework is built on top of JEE 5 and EJB3. It aims to further reduce the code required for building a functional application. Seam being, a component framework promises to deliver fullfeatured JEE 5 applications in a lightweight code base i.e. requiring only a fraction of the code of regular JEE applications.

JBoss Seam is a flexible web application framework introduced for Java EE 5. It eliminates the traditional tedious coding using clever architecture. Seam provides a consistent
  and easy to understand streamlined programming model for developing web based applications. Seam enables to access any backend EJB 3.0 component from the front-end simply by addressing it with the Seam component name.

JBoss Seam is compatible with most of the available application servers which support EJB 3.0 public draft and JSF 1.1 implementation. Seam is also usable with JBoss Micro- container and Hibernate due to its unique approach to maintain state management while not plugging into Java EE 5 and EJB 3.

Seam framework provides a command line tool seam-gen that can automatically generate a CRUD (create-read-update-delete) web application from the existing database. Seam provides the concept of declarative application state management for POJO component that means Seam extends annotations defined in EJB 3.0 having a new set of annotations for declarative state management, declarative context demarcation, state validation and eliminating XML required by plain JSF.

Every Seam component exists within a context as seam components are stateful and contextual having a well defined container-managed lifecycle. This approach helps to fix the bugs and performance problems results in plague web applications having non-linear or multi-window navigation. Seam integrates with the JBoss jBPM deeply to make the business process management, a first class construct. Seam also simplifies testing Java EE 5 applications in unit test framework by enforcing the JBoss Embedded EJB3 container. In other words, we can say that Seam is completely for enhancing developer’s productivity and application scalability.
Oct 2007 | Java Jazz Up |26
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