How to set the Transaction isolationlevel using Spring with MyBatis

Question

I like to set the Isolationlevel by my self, using the transactionmanager from the Spring Framework combined with myBatis. I was trying a lot of tutorial, but nothing worked.

My application is build as MVC Pattern, that means i have views, models, interfaces used for the dependency-injection from mybatis and a controller class.

I hope someone can give me advice i am new in mybatis and spring. The whole application is running very well but I like to take over controll over the isolationlevels.

This is the spring-configuration.xml file
        <!--<mybatis-spring:scan base-package="de.hrw.model.**"/> -->
    <mybatis-spring:scan base-package="de.hrw.*" />
    <context:component-scan base-package="de.hrw.*" />



     <bean id="dataSource" class="com.zaxxer.hikari.HikariDataSource">
        <property name="jdbcUrl" value="jdbc:mysql://127.0.0.1:3306/carrental">
        </property>
        <property name="username" value="root"></property>
        <property name="password" value="root"></property>
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="autoCommit" value="false"></property>
        <property name="registerMbeans" value="true"></property>
        <property name="transactionIsolation"
            value="TRANSACTION_SERIALIZABLE">
        </property> 
    </bean>


    <bean id="sqlSessionFactoryBean"
        class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property> 
        <property name="configLocation" value="classpath:mybatis-config.xml">
        </property>     
    </bean>

    <bean id="carController" class="de.hrw.controller.CarController">
        <property name="transactionManager" ref="transactionManager" /> 
    </bean>

    <bean id="carSearchView" class="de.hrw.view.CarSearchView">
    </bean>


    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <tx:annotation-driven transaction-manager="transactionManager"/>

I am using the dependecy-injection of mybatis to get data from and to the database

example of an iterface package de.hrw.mgmtDAO;

import java.util.List;

import de.hrw.model.CarModel;


public interface ICarMgmt {
    public CarModel selectCarById(final int carId);     
    public List<CarModel> selectAllCars(); 
}

this is the main-class where i include a view (frame)

public class Carrental_main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub

          ApplicationContext context = 
                  new ClassPathXmlApplicationContext("spring-config.xml");

          CarController carController = (CarController) context.getBean("carController");

          carController.openSearchView();
          carController.getCarSearchView().setVisible(true);
    }       

}

this is the controller. Here i try to set the isolation level to SERIALIZABLE but it is always set to default (-1)

@Transactional(propagation=Propagation.REQUIRES_NEW , isolation = Isolation.SERIALIZABLE)
public class CarController {
    @Autowired
    private ICarMgmt carMgmt;

private CarSearchView carSearchView;

private ApplicationContext applicationContext;
@Autowired
private PlatformTransactionManager transactionManager;

private TransactionStatus transactionStatus;

private TransactionDefinition defaultTransactionDefinition;

private DataSource dataSource;


public void openSearchView() {
    this.setApplicationContext();
    this.setDefaultTransactionDefinition();
    this.setTransactionStatus();

    this.carSearchView = (CarSearchView) applicationContext
            .getBean("carSearchView");


    try {

        List<CarModel> carList = carMgmt.selectAllCars();


        // this.carSearchView.setResultList(carList);
        this.carSearchView.setLabelList(carList);


        this.carSearchView.createTextFieldList();
        this.carSearchView.createLabelFieldList();


        transactionManager.commit(transactionStatus);

    } catch (DataAccessException e) {
        System.out.println("Error in creating record, rolling back");
        transactionManager.rollback(transactionStatus);
        throw e;
    }
}

 public void setDataSource(DataSource dataSource) {
          this.dataSource = dataSource;

       }

public void setDefaultTransactionDefinition() {
    this.defaultTransactionDefinition = new DefaultTransactionDefinition();
}

public void setApplicationContext() {
    applicationContext = new ClassPathXmlApplicationContext(
            "spring-config.xml");
}

public void setTransactionManager(
        PlatformTransactionManager transactionManager) {
    this.transactionManager = transactionManager;
}

public void setTransactionStatus() {
    this.transactionStatus = transactionManager.getTransaction(defaultTransactionDefinition);

}

Answer 1

I've finally found a solution. I changed the TransactionDefinition object in the controller to DefaultTransactionDefinition object

private DefaultTransactionDefinition defaultTransactionDefinition;

former it was

private TransactionDefinition defaultTransactionDefinition;

but the TransactionDefinition doesn't provide any setting methods. I was wondering, because in the documentation I found such methods to set the isolationlevel, but this methods are just provided by the DefaultTransactionDefinition. After I've found this failure i added the the following to lines of codes and it finally works

defaultTransactionDefinition.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);
defaultTransactionDefinition.setIsolationLevel(DefaultTransactionDefinition.ISOLATION_REPEATABLE_READ); 

Thx, for all your advises. If someone knows a really good tutorial for MyBatis + Spring and the transaction manager please post a link :D