为什么设置connection.setAutoCommit（false），插入，然后回滚，仍然将数据插入数据库？

我的环境：Windows 11 x64、Oracle数据库21c Express edtion、Java/JDK 19、IntelliJ IDEA 2023.x。我有

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.time.LocalDate;
import java.time.ZoneId;

public class VyInsert {

    public static void main(String[] args) {
        try (Connection connection = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE", "system", "12345678")) {

            if (connection != null) {
                connection.setAutoCommit(false);
                System.out.println("Connected to the database.");
                String query = "insert into SYSTEM.CUSTOMER (ID, NAME, EMAIL, CREATED_DATE) values (?, ?, ?, ?)";
                PreparedStatement preparedStatement = connection.prepareStatement(query);
                preparedStatement.setInt(1, 17);
                preparedStatement.setString(2, "Nguyen Thu Hang23");
                preparedStatement.setString(3, "anhtrangmuathu32@gmail.com");
                preparedStatement.setObject(4, LocalDate.now(ZoneId.of("America/Montreal")));
                // preparedStatement.setObject(4, LocalDate.now(ZoneId.of("Asia/Ho_Chi_Minh")));
                preparedStatement.executeUpdate();
                // connection.commit();
                //connection.setAutoCommit(true);
            } else {
                System.out.println("Failed to make connection.");
            }

        } catch (SQLException sqlException) {
            System.err.format("SQL State: %s\n%s", sqlException.getSQLState(), sqlException.getMessage());
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

}

为什么设置connection.setAutoCommit（false），插入，然后回滚，仍然将数据插入数据库？