Using Predefined Beans in CDI Applications (original) (raw)
2. Using the Tutorial Examples
3. Getting Started with Web Applications
4. JavaServer Faces Technology
7. Using JavaServer Faces Technology in Web Pages
8. Using Converters, Listeners, and Validators
9. Developing with JavaServer Faces Technology
10. JavaServer Faces Technology: Advanced Concepts
11. Using Ajax with JavaServer Faces Technology
12. Composite Components: Advanced Topics and Example
13. Creating Custom UI Components and Other Custom Objects
14. Configuring JavaServer Faces Applications
16. Uploading Files with Java Servlet Technology
17. Internationalizing and Localizing Web Applications
18. Introduction to Web Services
19. Building Web Services with JAX-WS
20. Building RESTful Web Services with JAX-RS
21. JAX-RS: Advanced Topics and Example
23. Getting Started with Enterprise Beans
24. Running the Enterprise Bean Examples
25. A Message-Driven Bean Example
26. Using the Embedded Enterprise Bean Container
27. Using Asynchronous Method Invocation in Session Beans
Part V Contexts and Dependency Injection for the Java EE Platform
28. Introduction to Contexts and Dependency Injection for the Java EE Platform
29. Running the Basic Contexts and Dependency Injection Examples
30. Contexts and Dependency Injection for the Java EE Platform: Advanced Topics
Using Alternatives in CDI Applications
Using Producer Methods, Producer Fields, and Disposer Methods in CDI Applications
Using Producer Fields to Generate Resources
Using Events in CDI Applications
Using Observer Methods to Handle Events
Using Interceptors in CDI Applications
Using Decorators in CDI Applications
Using Stereotypes in CDI Applications
31. Running the Advanced Contexts and Dependency Injection Examples
32. Introduction to the Java Persistence API
33. Running the Persistence Examples
34. The Java Persistence Query Language
35. Using the Criteria API to Create Queries
36. Creating and Using String-Based Criteria Queries
37. Controlling Concurrent Access to Entity Data with Locking
38. Using a Second-Level Cache with Java Persistence API Applications
39. Introduction to Security in the Java EE Platform
40. Getting Started Securing Web Applications
41. Getting Started Securing Enterprise Applications
42. Java EE Security: Advanced Topics
Part VIII Java EE Supporting Technologies
43. Introduction to Java EE Supporting Technologies
45. Resources and Resource Adapters
46. The Resource Adapter Example
47. Java Message Service Concepts
48. Java Message Service Examples
49. Bean Validation: Advanced Topics
50. Using Java EE Interceptors
51. Duke's Bookstore Case Study Example
52. Duke's Tutoring Case Study Example
53. Duke's Forest Case Study Example
CDI provides predefined beans that implement the following interfaces:
javax.transaction.UserTransaction
A Java Transaction API (JTA) user transaction.
java.security.Principal
The abstract notion of a principal, which represents any entity, such as an individual, a corporation, or a login ID. Whenever the injected principal is accessed, it always represents the identity of the current caller. For example, a principal is injected into a field at initialization. Later, a method that uses the injected principal is called on the object into which the principal was injected. In this situation, the injected principal represents the identity of the current caller when the method is run.
javax.validation.Validator
A validator for bean instances. The bean that implements this interface enables a Validator object for the default bean validation ValidatorFactory object to be injected.
javax.validation.ValidatorFactory
A factory class for returning initialized Validator instances. The bean that implements this interface enables the default bean validation object ValidatorFactory to be injected.
To inject a predefined bean, create an injection point by using thejavax.annotation.Resource annotation to obtain an instance of the bean. For the bean type, specify the class name of the interface the bean implements.
Predefined beans are injected with dependent scope and the predefined default qualifier @Default.
For more information about injecting resources, see Resource Injection.
The following code snippet shows how to use the @Resource annotation to inject a predefined bean. This code snippet injects a user transaction into the servlet class TransactionServlet. The user transaction is an instance of the predefined bean that implements the javax.transaction.UserTransaction interface.
import javax.annotation.Resource; import javax.servlet.http.HttpServlet; import javax.transaction.UserTransaction; ... public class TransactionServlet extends HttpServlet { @Resource UserTransaction transaction; ... }
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