Java Reference
In-Depth Information
• A
message-driven bean
combines features of a session bean and a message listener,
allowing a business component to receive messages asynchronously. Commonly,
these are Java Message Service (JMS) messages.
In the Java EE 6 platform, new enterprise bean features include the following:
• The ability to package local enterprise beans in a WAR file
• Singleton session beans, which provide easy access to shared state
• A lightweight subset of Enterprise JavaBeans functionality (EJB Lite) that can be
provided within Java EE Profiles, such as the Java EE Web Profile.
The Java EE 6 platform requires Enterprise JavaBeans 3.1 and Interceptors 1.1. The In-
terceptors specification, which is part of the EJB 3.1 specification, makes more generally
available the interceptor facility originally defined as part of the EJB 3.0 specification.
Java Servlet Technology
Java Servlet technology lets you define HTTP-specific servlet classes. A servlet class ex-
tends the capabilities of servers that host applications accessed by way of a request-re-
sponse programming model. Although servlets can respond to any type of request, they
are commonly used to extend the applications hosted by web servers.
In the Java EE 6 platform, new Java Servlet technology features include the following:
• Annotation support
• Asynchronous support
• Ease of configuration
• Enhancements to existing APIs
• Pluggability
The Java EE 6 platform requires Servlet 3.0.
JavaServer Faces Technology
JavaServer Faces technology is a user interface framework for building web applications.
The main components of JavaServer Faces technology are as follows:
• A GUI component framework.
• A flexible model for rendering components in different kinds of HTML or different
markup languages and technologies. A
Renderer
object generates the markup to
render the component and converts the data stored in a model object to types that
can be represented in a view.
• A standard
RenderKit
for generating HTML/4.01 markup.
