Introducing Java Web Development - Learn Java for Web Development - page 7

Table 1-3. Web Profile 7 Specification
Specification

Version URL

http://jcp.org/en/jsr/detail?id=344 JSF 2.2

http://jcp.org/en/jsr/detail?id=245

JSP 2.3

http://jcp.org/en/jsr/detail?id=52 JSTL 1.2

http://jcp.org/en/jsr/detail?id=340 Servlet 3.1

http://jcp.org/en/jsr/detail?id=356

WebSocket 1.0

http://jcp.org/en/jsr/detail?id=341 Expression Language 3.0

http://jcp.org/en/jsr/detail?id=345

EJB Lite 3.2

http://jcp.org/en/jsr/detail?id=338 JPA 2.1

http://jcp.org/en/jsr/detail?id=907 JTA 1.2

http://jcp.org/en/jsr/detail?id=349

Bean Validation 1.1

http://jcp.org/en/jsr/detail?id=316 Managed Beans 1.0

http://jcp.org/en/jsr/detail?id=318

Interceptors 1.2

http://jcp.org/en/jsr/detail?id=346 Contexts and Dependency

Injection

1.1

http://jcp.org/en/jsr/detail?id=330 Dependency Injection for Java 1.0

http://jcp.org/en/jsr/detail?id=45

Debugging Support for Other
Languages

1.0

http://jcp.org/en/jsr/detail?id=339

JAX-RS 2.0

http://jcp.org/en/jsr/detail?id=353 JSON-P 1.0

Regarding the Web Profile specifications listed in Table 1-3 :

 In Java EE 7, no changes were made to JSP and JSTL because these

specifications have not been updated.

 Expression Language has been removed from JSP and now has its own

JSR (341).

 Servlets and JSF have both been updated.

 WebSocket 1.0 was introduced in Java EE 7.

This topic concentrates on the web tier of Java EE; we will dive deep into the web tier in Chapter 2.

The multitier architecture of Java EE has a tremendous impact on the development of Java
enterprise applications. A Java enterprise application can be defined as a Java application that
utilizes the enterprise services offered by Java EE. In fact, a web application can be classified as
an enterprise application if it utilizes Java EE services in the form of components packed in the
web tier. Java EE isolates these services functionally into separate tiers, as illustrated in Figure 1-3 ,
by providing an application model on which the Java enterprise applications should be built. As a
consequence, the Java enterprise application mirrors the multitier architecture of Java EE. Figure 1-4
illustrates a generalized view of the layers of a typical web application.