Transactions - The Java EE 6 Tutorial, Volume I

Document Information

Part I Introduction

2. Using the Tutorial Examples

Part II The Web Tier

3. Getting Started with Web Applications

4. JavaServer^TM Faces Technology

5. Introduction to Facelets

6. Unified Expression Language

7. Using JavaServer^TM Faces Technology in Web Pages

8. Using Converters, Listeners and Validators

9. Developing With JavaServer^TM Faces Technology

10. Java Servlet Technology

Part III Web Services

11. Introduction to Web Services

12. Building Web Services with JAX-WS

13. Building RESTful Web Services with JAX-RS and Jersey

Part IV Enterprise Beans

14. Enterprise Beans

15. Getting Started with Enterprise Beans

16. Running the Enterprise Bean Examples

Part V Contexts and Dependency Injection for the Java^TM EE Platform

17. Introduction to Contexts and Dependency Injection for the Java^TM EE Platform

18. Running the Basic Contexts and Dependency Injection Examples

Part VI Persistence

19. Introduction to the Java Persistence API

20. Running the Persistence Examples

21. The Java Persistence Query Language

22. Creating Queries Using the Criteria API

Part VII Security

23. Introduction to Security in the Java EE Platform

24. Getting Started Securing Enterprise Applications

25. Getting Started Securing Web Applications

Part VIII Java^TM EE Supporting Technologies

26. Introduction to Java^TM EE Supporting Technologies

27. Transactions

What Is a Transaction?

Container-Managed Transactions

Transaction Attributes

Required Attribute

RequiresNew Attribute

Mandatory Attribute

NotSupported Attribute

Supports Attribute

Never Attribute

Summary of Transaction Attributes

Setting Transaction Attributes

Rolling Back a Container-Managed Transaction

Synchronizing a Session Bean's Instance Variables

Methods Not Allowed in Container-Managed Transactions

Bean-Managed Transactions

JTA Transactions

Returning without Committing

Methods Not Allowed in Bean-Managed Transactions

Transaction Timeouts

Updating Multiple Databases

Transactions in Web Components

28. Resource Connections

Chapter 27

Transactions

A typical enterprise application accesses and stores information in one or more databases. Because this information is critical for business operations, it must be accurate, current, and reliable. Data integrity would be lost if multiple programs were allowed to update the same information simultaneously. It would also be lost if a system that failed while processing a business transaction were to leave the affected data only partially updated. By preventing both of these scenarios, software transactions ensure data integrity. Transactions control the concurrent access of data by multiple programs. In the event of a system failure, transactions make sure that after recovery the data will be in a consistent state.

The following topics are addressed here:

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