BeanNotOfRequiredTypeException with PlatformTransactionManager - spring

Question

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 :-)

Answer 1

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">