Styjun

I'm new to Spring and I did a login/register applicaton following a youtube tutorial but I want to add a new functionality that allows to delete a student. I used @Transactional on my delete method and modified accordingly the xml file but I get this error:

Message Request processing failed; nested exception is org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'platformTransactionManager' is expected to be of type 'org.springframework.transaction.PlatformTransactionManager' but was actually of type 'com.infotech.service.impl.StudentServiceImpl'

my Service class

@Service("studentService")
public class StudentServiceImpl implements StudentService 

 @Autowired
 private StudentDAO studentDAO;

 public void setStudentDAO(StudentDAO studentDAO) 
 this.studentDAO = studentDAO;
 

 public StudentDAO getStudentDAO() 
 return studentDAO;
 

 //other methods

 @Override
 public void delete(String email) 
 getStudentDAO().delete(email);
 

my DAO class

@EnableTransactionManagement
@Repository("studentDAO")

public class StudentDAOImpl implements StudentDAO 

 @Autowired
 private HibernateTemplate hibernateTemplate;

 public void setHibernateTemplate(HibernateTemplate hibernateTemplate) 
 this.hibernateTemplate = hibernateTemplate;
 

 public HibernateTemplate getHibernateTemplate() 
 return hibernateTemplate;
 

 @Autowired
 private SessionFactory sessionFactory;

 protected Session getSession() 
 return (Session) sessionFactory.getCurrentSession();
 

 //other methods

 @Transactional("platformTransactionManager")

 public void delete(String email) 
 Student student = (Student) ((HibernateTemplate) getSession()).get(Student.class, email);
 ((HibernateTemplate) getSession()).delete(student);
 

In the dispatcher servlet I have defined InternalResourceViewResolver, dataSource, hibernateTemplate, sessionFactory beans and then I added another bean

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

<bean id= "platformTransactionManager"class="com.infotech.service.impl.StudentServiceImpl">
</bean>

Finally, this is the controller

@Controller
public class MyController 
 @Autowired
 private StudentService studentService;

 public void setStudentService(StudentService studentService) 
 this.studentService = studentService;
 

 public StudentService getStudentService() 
 return studentService;
 

 //...RequestMappings...

 @RequestMapping(value = "/delete/email", method = RequestMethod.GET)
 public ModelAndView delete(@PathVariable("email") String email) 
 studentService.delete(email);

 return new ModelAndView("redirect:/view/home");
 

 ...

Now, how can I make my bean of PlatformTransactionManager type?
But most of all I think there's a simpler way to delete a field from my table, maybe without using @Transaction at all so can anyone help me understand why I get the error and explain me what is @Transactional and if I really should use it in this case?
Remember that I'm NEW to Spring, I still don't have many notions so sorry if I wrote something totally stupid :-)

Spring is looking for transaction manager - it requires a concrete implementation of the PlatformTransactionManager interface. It's being given your service implementation, which isn't a PlatformTransactionManager and not what it needs. If you're using JDBC, org.springframework.jdbc.datasource.DataSourceTransactionManager should work.

Try changing:

<bean id= "platformTransactionManager" class="com.infotech.service.impl.StudentServiceImpl">

To:

<bean id= "platformTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">