The Java Transaction API (JTA) provides a standard interface for managing transactions across multiple resources in Java applications. It specifies interfaces for a transaction manager and XA resource to enable distributed transactions between an application server, JDBC driver, and database. JTA transactions have ACID properties and allow the application developer to work with transactions without managing the underlying transaction coordination.

1. JAVA TRANSACTION API

2. Transaction
■ is a complete unit of work that completes succesfully or
results with unaltered state.
■ has two types;
□ Local transactions
□ Distributed transactions

3. ■ consists of
• Java classes
• Packages
• Interfaces
■ Each version of Java has its own API

4. Transaction Environment Schema
JTA
----------------------X Java Application
—
Application Server
— JDBC Driver
Manager I
JDBC Driver
Interfaces:
■ 1. UserTransaction
■ 2. Transaction
Manager
3. XA Resource
Database Database

5. Java Transaction API
■ high level, implementation independent, protocol
independent API.
■ offered by J2EE technology.
■ provides reliable environment for the J2EE
container.

6. Any Questions???

7. Extensions to the JTA can be provided. For
example;
Clients can suspend and resume the
transaction
■ Users can get and set transaction properties.
■ Users can obtain the current transaction
manager.

8. Java Transaction API
■ enables applications to perform distributed
transactions.
■ specifies standard Java interfaces between a
transaction manager and other components
involved in a distributed transaction system.
■ transaction manager, application, application
server, and resource manager take roles in.

9. JTA vs JDBC
Application server, JDBC driver and transaction
manager care about the distributed transaction
management.
Application developer should not enter the scope of
the transaction.

10. Outline
Transaction
■ Java Transaction
■ Java API
Java Transaction API
■ Transaction and Resource Managers
> JTAvs JDBC
JTA vs EJB
■ Extensions to JTA
■ Advantages and Disadvantages of JTA

11. Java Transaction
■ Java Transaction Service(JTS)
- specifies the implementation of a Java
transaction manager.
■ Java Transaction API(JTA)
- calls the lower-level JTS methods.

12. Java Transaction Initiative
Java Transaction Service

13. Advantages vs Disadvantages
+ provides modularity.
+ guarantees ACID properties.
+ application developer does not need to care about
the transaction management
- does not support nested transactions.

14. ■ EJB container is responsible for transaction
processing.
■ A stateless session bean can obtain a
UserTransaction object via the EJBContext using the
getllserTransaction() method.
■ Session bean usage could be bundled together with a
JTA UserTransaction object where each session bean
is deployed on a different EJB server.

15. JTA vs JDBC
■ JDBC driver has to support both normal JDBC
interactions and XAResource part of JTA.
XA protocol enables resource manager to take
place in the transaction.
■ JDBC is responsible for "translating" between
resource manager and transaction manager.

16. Transaction and Resource Managers
■ Transaction manager decides whether to commit or
rollback at the end of the transaction in a distributed
system and coordinates various resource managers.
■ Resource manager is responsible from the controlling
of accessing the common resources in the distributed
system.