Chapter 2. The contextual component model

2.1. Seam contexts

2.1.1. Stateless context
2.1.2. Event context
2.1.3. Page context
2.1.4. Conversation context
2.1.5. Session context
2.1.6. Business process context
2.1.7. Application context
2.1.8. Context variables
2.1.9. Context search priority
2.1.10. Concurrency model

2.2. Seam components

2.2.1. Stateless session beans
2.2.2. Stateful session beans
2.2.3. Entity beans
2.2.4. JavaBeans
2.2.5. Message-driven beans
2.2.6. Interception
2.2.7. Component names
2.2.8. Defining the component scope
2.2.9. Components with multiple roles
2.2.10. Built-in components

2.3. Bijection

2.4. Lifecycle methods

2.5. Conditional installation

2.6. Logging

2.7. The Mutable interface and @ReadOnly

2.8. Factory and manager components

The two core concepts in Seam are the notion of a context and the notion of a component. Components are stateful objects, usually EJBs, and an instance of a component is associated with a context, and given a name in that context. Bijection provides a mechanism for aliasing internal component names (instance variables) to contextual names, allowing component trees to be dynamically assembled, and reassembled by Seam.

Let's start by describing the contexts built in to Seam.