1. Prepared by Mehmet Küçüksayan Mustafa Ecmel Özdemir
Java Transaction API
Prepared by
Mehmet Küçüksayan
Mustafa Ecmel Özdemir

2. Outline Transaction Java Transaction Java API Java Transaction API
Transaction and Resource Managers
JTA vs JDBC
JTA vs EJB
Extensions to JTA
Advantages and Disadvantages of JTA

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

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

5. Java Transaction Initiative

6. Java API consists of Java classes Packages Interfaces
Each version of Java has its own API

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

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. 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.

10. Transaction Environment Schema
Interfaces:
1. UserTransaction
2. Transaction
Manager
3. XA Resource

11. 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.

12. 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.

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

14. Extensions to JTA 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.

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

16. Any Questions???