12 BENEFITS of Spring MVC over Struts

Spring is a powerful Java application framework, used in a wide range of Java applications. It provides enterprise services to Plain Old Java Objects (POJOs). Spring uses dependency injection to achieve simplification and increase testability.

1. Spring provides a very clean division between controllers, JavaBean models, and views.

2. Spring’s MVC is very flexible. Unlike Struts, which forces your Action and Form objects into concrete inheritance (thus taking away your single shot at concrete inheritance in Java), Spring MVC is entirely based on interfaces. Furthermore, just about every part of the Spring MVC framework is configurable via plugging in your own interface. Of course we also provide convenience classes as an implementation option.

3. Spring, like WebWork, provides interceptors as well as controllers, making it easy to factor out behavior common to the handling of many requests.

4. Spring MVC is truly view-agnostic. You don’t get pushed to use JSP if you don’t want to; you can use Velocity, XLST or other view technologies. If you want to use a custom view mechanism – for example, your own templating language – you can easily implement the Spring View interface to integrate it.

5. Spring Controllers are configured via IoC like any other objects. This makes them easy to test, and beautifully integrated with other objects managed by Spring.

6. Spring MVC web tiers are typically easier to test than Struts web tiers, due to the avoidance of forced concrete inheritance and explicit dependence of controllers on the dispatcher servlet.

7. The web tier becomes a thin layer on top of a business object layer. This encourages good practice. Struts and other dedicated web frameworks leave you on your own in implementing your business objects; Spring provides an integrated framework for all tiers of your application.

8. No ActionForms. Bind directly to domain objects

9. More testable code (validation has no dependency on Servlet API)

10. Struts imposes dependencies on your Controllers (they must extend a Struts class), Spring doesn’t force you to do this although there are convenience Controller implementations that you can choose to extend.

11. Spring has a well defined interface to business layer

12. Spring offers better integration with view technologies other than JSP (Velocity / XSLT / FreeMarker / XL etc.)

Reference: Here

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Quartz – an opensource Job scheduler

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Quartz is a full-featured, open source job scheduling system that can be integrated with, or used along side virtually any J2EE or J2SE application – from the smallest stand-alone application to the largest e-commerce system. Quartz can be used to create simple or complex schedules for executing tens, hundreds, or even tens-of-thousands of jobs; jobs whose tasks are defined as standard Java components or EJBs. The Quartz Scheduler includes many enterprise-class features, such as JTA transactions and clustering.

Jobs are scheduled to run when a given Trigger occurs. Triggers can be created with nearly any combination of the following directives:

  • at a certain time of day (to the millisecond)
  • on certain days of the week
  • on certain days of the month
  • on certain days of the year
  • not on certain days listed within a registered Calendar (such as business holidays)
  • repeated a specific number of times
  • repeated until a specific time/date
  • repeated indefinitely
  • repeated with a delay interval

We are using this simple but fully loaded job scheduler for the scheduling purpose.

References : here and here

Technorati tags: Quartz, Scheduler

Spring Web Flow 1.0: The next generation web application controller framework

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Spring Web Flow 1.0 has been released. This is a next generation web application controller framework that runs on Java SE 1.3 or greater, and Java EE 1.3 (Servlet 2.3, Portlet 1.0) or greater. The framework allows developers to define user interaction and application behavior as reusable, high-level modules called flows. The product is particularly suited for implementing wizards and other guided processes.

You can download the release here and view the on-line documentation. Existing users running on previous versions should checkout the 1.0 upgrade guide.

Reference : http://www.theserverside.com/news/thread.tss?thread_id=42799

Technorati tags: Spring framework, Spring web flow

The seven modules of the Spring framework

Spring is an open source framework created to address the complexity of enterprise application development. One of the chief advantages of the Spring framework is its layered architecture, which allows you to be selective about which of its components you use while also providing a cohesive framework for J2EE application development.

The Spring framework is a layered architecture consisting of seven well-defined modules. The Spring modules are built on top of the core container, which defines how beans are created, configured, and managed, as shown in the following figure.

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Each of the modules (or components) that comprise the Spring framework can stand on its own or be implemented jointly with one or more of the others. The functionality of each component is as follows:

* The core container: The core container provides the essential functionality of the Spring framework. A primary component of the core container is the BeanFactory, an implementation of the Factory pattern. The BeanFactory applies the Inversion of Control (IOC) pattern to separate an application’s configuration and dependency specification from the actual application code.

* Spring context: The Spring context is a configuration file that provides context information to the Spring framework. The Spring context includes enterprise services such as JNDI, EJB, e-mail, internalization, validation, and scheduling functionality.

* Spring AOP: The Spring AOP module integrates aspect-oriented programming functionality directly into the Spring framework, through its configuration management feature. As a result you can easily AOP-enable any object managed by the Spring framework. The Spring AOP module provides transaction management services for objects in any Spring-based application. With Spring AOP you can incorporate declarative transaction management into your applications without relying on EJB components.

* Spring DAO: The Spring JDBC DAO abstraction layer offers a meaningful exception hierarchy for managing the exception handling and error messages thrown by different database vendors. The exception hierarchy simplifies error handling and greatly reduces the amount of exception code you need to write, such as opening and closing connections. Spring DAO’s JDBC-oriented exceptions comply to its generic DAO exception hierarchy.

* Spring ORM: The Spring framework plugs into several ORM frameworks to provide its Object Relational tool, including JDO, Hibernate, and iBatis SQL Maps. All of these comply to Spring’s generic transaction and DAO exception hierarchies.

* Spring Web module: The Web context module builds on top of the application context module, providing contexts for Web-based applications. As a result, the Spring framework supports integration with Jakarta Struts. The Web module also eases the tasks of handling multi-part requests and binding request parameters to domain objects.

* Spring MVC framework: The Model-View-Controller (MVC) framework is a full-featured MVC implementation for building Web applications. The MVC framework is highly configurable via strategy interfaces and accommodates numerous view technologies including JSP, Velocity, Tiles, iText, and POI.

Spring framework functionality can be used in any J2EE server and most of it also is adaptable to non-managed environments. A central focus of Spring is to allow for reusable business and data-access objects that are not tied to specific J2EE services. Such objects can be reused across J2EE environments (Web or EJB), standalone applications, test environments, and so on, without any hassle.

Reference: http://www-128.ibm.com/developerworks/library/wa-spring1/

Technorati tags: Spring Framework