Chapter 2. JavaEE Architecture

Enterprise Java Development@TOPIC@

Chapter 2. JavaEE Architecture

2.1. Profiles

2.1.1. Web Profile

2.2. Application Components

2.2.1. Application Clients
2.2.2. Applets
2.2.3. Servlets/JSPs/JSF
2.2.4. Enterprise JavaBeans(tm) (EJB)

2.3. Containers

2.3.1. Servers

2.4. Resource Adapters

2.5. Databases

Figure 2.1. JavaEE Architecture

JavaEE Architecture

2.1. Profiles

Subset of JavaEE APIs targeted at key use cases
Share common underlying APIs for consistency
Provide smaller gates of entry for providers
Provide means to eliminate deprecated specs from concern
Risk fragmenting community and introducing confusion -- not taken lightly

2.3. Containers

Provide runtime support for JavaEE application components
Provide an interpose layer arround/between each component
Inject required components
Application developers may think of the Application Server==Container
Containers address specifics of the standards (e.g., deployment artifact structure)

2.3.1. Servers

Host the containers and their application clients
No physical requirements (single server or multiple servers per container/conatiner type)
May be a general-purpose transaction platform adapted to JavaEE by the containers

2.4. Resource Adapters

System-level software component
Extends standard APIs into specific resources (e.g., JDBC)
Framework provided for:

2.5. Databases

Pervasive player in most JavaEE application clients
Not applicable for Applets