Geronimo plug -in, connector 1.6: Java class library uses the common question manager (JTA11) in the Java class library (JTA11)
Geronimo plug -in, connector 1.6: Java class library uses the common question manager (JTA11) in the Java class library (JTA11)
introduction:
In Java development, the use of transaction manager is very important to ensure the consistency and integrity of the database operation.The Geronimo plug -in is a powerful Java class library that can provide support from connectors 1.6 and JTA11.This article will answer some common questions that use the Geronimo plug -in and connectors 1.6, and provide the corresponding Java code examples.
Question 1: How to use Geronimo plug -in and connectors 1.6 in the Java application?
Answer: To use the Geronimo plug -in and connectors 1.6 in the Java application, first need to add the dependencies of the Geronimo plugin to the project construction file.The following is a fragment of a sample pom.xml file.
<dependencies>
...
<dependency>
<groupId>org.apache.geronimo.components</groupId>
<artifactId>geronimo-connector</artifactId>
<version>1.6</version>
</dependency>
...
</dependencies>
After adding dependencies, you can use Geronimo plug -in and connectors 1.6 in Java applications.Below is an example code that uses the Geronimo connector to obtain a database connection:
import javax.naming.InitialContext;
import javax.sql.DataSource;
import java.sql.Connection;
public class MyApp {
public static void main(String[] args) {
try {
// Get jndi context
InitialContext initialContext = new InitialContext();
// Find the data source
DataSource dataSource = (DataSource) initialContext.lookup("java:comp/env/jdbc/myDataSource");
// Get the database connection
Connection connection = dataSource.getConnection();
// Use the connection to execute the database operation
// ...
// Turn off the connection
connection.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
Question 2: How to enable JTA11 transaction manager in Java applications?
Answer: To enable the JTA11 transaction manager in the Java application, you need to perform related configuration in the configuration file of the Geronimo plugin.The following is an example of the Geronimo-Web.xml file, which shows how to configure the JTA11 transaction manager:
<web:web-app xmlns:web="http://geronimo.apache.org/xml/ns/j2ee/web-1.2" xmlns:tran="http://geronimo.apache.org/xml/ns/transaction-1.1">
...
<web:transaction-config>
<tran:transaction-manager id="tm" tran:transaction-manager-type="JTA" />
</web:transaction-config>
...
</web:web-app>
In the above configuration, the JTA transaction manager is specified and a transaction manager with an ID "TM" is assigned.You can perform corresponding configurations according to actual needs.
Question 3: How to open, submit and roll back transactions in the Java application?
Answer: Use the JTA11 transaction manager in the Java application. You can use javax.transaction.usertransaction interface to open, submit and roll back transactions.The following is an example code that shows how to use the JTA11 transaction manager in Java applications:
import javax.naming.InitialContext;
import javax.transaction.UserTransaction;
public class MyApp {
public static void main(String[] args) {
try {
// Get jndi context
InitialContext initialContext = new InitialContext();
// Find transaction objects
UserTransaction transaction = (UserTransaction) initialContext.lookup("java:comp/UserTransaction");
// Open transaction
transaction.begin();
// Execute the database operation
// ...
// Submit a transaction
transaction.commit();
} catch (Exception e) {
e.printStackTrace();
// Roll back transactions
transaction.rollback();
}
}
}
In the above examples, the JNDI context was first obtained and the userTransaction object was found.Then, turn on the transaction and perform the database operation, and finally submit or roll back according to the results of the operation.
in conclusion:
This article introduces how to use Geronimo plug -in and connectors 1.6 in Java applications to manage affairs.We answered some common questions and provided the necessary Java code examples.With the Geronimo plug -in and connectors 1.6, you can easily implement transaction management to ensure the consistency and integrity of data.
