How to use JTA 1.1 framework to implement distributed transactions
How to use JTA 1.1 framework to implement distributed transactions
Overview:
Java Affairs API (JTA) is part of the Java EE platform. It provides a standard method to handle distributed transactions across multiple resources.JTA 1.1 is the latest version of the Java EE 7 specification.In this article, we will introduce how to use the JTA 1.1 framework to achieve distributed transactions and provide the corresponding Java code example.
Step 1: Configure JTA 1.1 dependencies
First, you need to configure the JTA 1.1 dependencies in the project.In the Maven project, you can add the following dependencies to the pom.xml file:
<dependency>
<groupId>javax.transaction</groupId>
<artifactId>jta</artifactId>
<version>1.1</version>
</dependency>
Step 2: Configure transaction manager
JTA needs a transaction manager to coordinate distributed transactions.You can use open source transaction managers, such as Atomikos or Bitronix, or the transaction manager that comes with the Java EE server.In this article, we will show how to use the Atomikos transaction manager.
First, you need to add the relevant dependencies of Atomikos to the project.In the Maven project, you can add the following dependencies to the pom.xml file:
<dependency>
<groupId>com.atomikos</groupId>
<artifactId>transactions-jta</artifactId>
<version>4.0.6</version>
</dependency>
Then, you need to configure the Atomikos transaction manager.You can use the `JTATRANACTIONAGER` class to configure the transaction manager in Spring.For example:
import com.atomikos.icatch.jta.UserTransactionManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.jta.JtaTransactionManager;
@Configuration
public class TransactionConfig {
@Bean
public UserTransactionManager userTransactionManager() {
UserTransactionManager userTransactionManager = new UserTransactionManager();
userTransactionManager.setForceShutdown(true);
return userTransactionManager;
}
@Bean
public JtaTransactionManager jtaTransactionManager() {
JtaTransactionManager jtaTransactionManager = new JtaTransactionManager();
jtaTransactionManager.setTransactionManager(userTransactionManager());
return jtaTransactionManager;
}
}
Step 3: Use distributed transactions in the code to process
Now you have configured the JTA 1.1 dependency item and transaction manager, and then you can use distributed transactions in the code.
First, you need to define the code segment that requires transaction processing.You can encapsulate the code segment in the annotation of `javax.transaction.transactional`, and use the communication behavior of specified transactions specified by the attributes of the` propagation`
import javax.transaction.Transactional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class UserService {
@Autowired
private UserRepository userRepository;
@Transactional(rollbackOn = Exception.class, propagation = Propagation.REQUIRED)
public void createUser(User user) {
userRepository.save(user);
}
}
In the above examples, the `CreateUser` method will be executed in a new transaction, and if any exception is thrown, the transaction will be rolled back.
Next, you can call the method with `javax.transactions.transactions' annotations in other code to achieve distributed transaction processing.For example:
import javax.transaction.Transactional;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
@Service
public class AnotherService {
@Autowired
private UserService userService;
@Autowired
private ProductService productService;
@Transactional(rollbackOn = Exception.class, propagation = Propagation.REQUIRED)
public void process() {
User user = new User();
userService.createUser(user);
Product product = new Product();
productService.createProduct(product);
}
}
In the above examples, the `Process` method will be executed in a new transaction, and will call the` userService.createUser` and `ProductService.createProduct`.If any exception is thrown, the transaction will roll back.
in conclusion:
The use of the JTA 1.1 framework can easily achieve distributed transactions.By configured JTA dependencies and transaction managers, you can use the `javax.transaction.transactional" annotation to define and manage transactions.The above provides a basic example, you can further customize and expand according to your needs.
Reference link:
-[jta 1.1 official document] (https://javaee.github.io/javaee-spec/javadocs/javax/transage-summary.html)
- [Atomikos transaction manager] (https://www.atomikos.com)
-[Spring JTA transaction management document]
