Using transactional in spring boot with hibernate - spring-boot

Question

I am getting the error while using hibernate in spring boot application No qualifying bean of type TransactionManager' available
I am using the following config class:
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.springframework.context.annotation.Bean;
import org.springframework.transaction.annotation.EnableTransactionManagement;
#org.springframework.context.annotation.Configuration
#EnableTransactionManagement
public class Config {
#Bean
public SessionFactory sessionFactory() {
Configuration configuration = new Configuration();
configuration.configure();
configuration.addAnnotatedClass(Ct.class);
configuration.addAnnotatedClass(St.class);
SessionFactory sessionFactory = configuration.buildSessionFactory();
return sessionFactory;
}
}
#RestController
public class RestAPIController {
#Autowired
private SessionFactory sessionFactory;
#PutMapping("/addS")
#Transactional
public void addSt(#RequestParam("cc") String cc,#RequestParam("st") String st) {
CC cc1= new CC();
CC.setCode(cc);
State state = new State(cc,st);
sessionFactory.getCurrentSession().save(state);
}
}
}
The main reason I added the #Transactional in the addSt method is due to error: The transaction was still an active when an exception occurred during Database.
So I turned to use spring boot for managing transactions. I am not sure what to do here.
--------------------UPDATED CODE--------------------
#Repository
public interface StateRepository extends CrudRepository<State, String> {}
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import java.util.ArrayList;
import java.util.List;
#Service
#Transactional
public class StateService {
#Autowired
private StateRepository stateRepository;
public void save(State state) {
stateRepository.save(state);
}
public List<State> findAll() {
List<State> states = new ArrayList<>();
stateRepository.findAll().forEach(states::add);
return states;
}
}

Answer 1

For starters use proper layers and write a service and use JPA instead of plain Hibernate. If you want a Session you can always use EntityManager.unwrap to obtain the underlying Session.
#Service
#Transactional
public StateService {
#PersistenceContext
private EntityManager em;
public void save(State state) {
em.persist(state);
}
Use this service in your controller instead of the SessionFactory.
#RestController
public class RestAPIController {
private final StateService stateService;
RestAPIController(StateService stateService) {
this.stateService=stateService;
}
#PutMapping("/addS")
public void addSt(#RequestParam("cc") String cc, #RequestParam("st") String st) {
CC cc1= new CC();
CC.setCode(cc);
State state = new State(cc,st);
stateService.save(state);
}
}
Now ditch your Config class and restart the application.
NOTE
When using Spring Data JPA it is even easier, define a repository extending CrudRepository and inject that into the service instead of an EntityManager. (I'm assuming that Long is the type of primary key you defined).
public interface StateRepository extends CrudRepository<State, Long> {}
#Service
#Transactional
public StateService {
private final StateRepository states;
public StateService(StateRepository states) {
this.states=states;
}
public void save(State state) {
states.save(state);
}
}