I have written a sample spring boot application and it is failing to run with message
`
Description:
Field customerRepository in com.hibernatetutorial.service.CustomerServiceImpl required a bean of type 'com.hibernatetutorial.repository.CustomerRepository' that could not be found.
Action:
Consider defining a bean of type 'com.hibernatetutorial.repository.CustomerRepository' in your configuration.`
I have a #Repository annotation on CustomerRepository class and it's package is the there in base package scanning.
Below is configuration
#SpringBootApplication
#ComponentScan(basePackages="com.hibernatetutorial")
public class HibernateTutorialApplication {
public static void main(String[] args) {
SpringApplication.run(HibernateTutorialApplication.class, args);
}
}
#Repository
#Transactional
public interface CustomerRepository extends JpaRepository<Customer, UUID>{
}
#Service
#Transactional
public class CustomerServiceImpl implements CustomerService {
#Autowired
private CustomerRepository customerRepository;
public Customer createCustomer(Customer customer) {
return customerRepository.save(customer);
}
}
Customer entity is annotated with #Entity. Any suggestion if I miss anything
To make use of JpaRepository you need to add one of the following to your Application:
#EnableAutoConfiguration for Spring Boot to figure it out itself or
#EnableJpaRespositories(basePackageScan="com.example") to specify it yourself
For more information
Please verify your CustomerRepository and CustomerServiceImpl Java files are under the same packege com.hibernatetutorial.
Related
I am trying to implement as of enterprise level, there they have folders like Repository,Service,ServiceImpl
In Services they have interface with method declaration
In ServiceImpl they have class implementing the interface of services
In Repository they have all Repository interfaces
BeanInjection is a class where we have all repositories and service classes and interfaces with
#Autowired annotation.
When I tried to implement "#Autowired" to service class getting this Error.
Tried this no help link
Tried this no help but getting loop error link
Controller.java
public class SessionController extends BeanInjectionService {
#GetMapping
public ResponseEntity<List<Session>> list(){
LOGGER.info("Request received to view the sessions");
List<Session> sessions = sessionService.findAll();
LOGGER.info("Successfully fetched all the sessions");
return new ResponseEntity<>(sessions, HttpStatus.OK);
}
SessionService.java(Interface)
public interface SessionService {
List<Session> findAll();
}
SessionServiceImpl.java(Class)
public class SessionServiceImpl extends BeanInjectionService implements SessionService {
#Override
public List<Session> findAll(){
return sessionRepository.findAll();
}
BeanInjectionService.java(Class)
public class BeanInjectionService {
#Autowired
public SessionRepository sessionRepository;
**// Error Showing here while starting application
// Consider defining a bean of type 'com.example.conferencedemo.services.SessionService' in your configuration.**
#Autowired
public SessionService sessionService;
#Autowired
public SpeakerRepository speakerRepository;
#Autowired
public SpeakerService speakerService;
}
SessionRepository.java(Interface)
public interface SessionRepository extends JpaRepository<Session,Long> {
}
Thanks in advance
I find using BeanInjectionService a little weird, but I'll answer around it.
Unless you add #Service on SessionServiceImpl, you can't autowire it.
Circular dependency - If you do step 1, it will create a circular dependency because SessionServiceImpl needs its superclass object(BeanInjectionService) to be created first. But BeanInjectionService cannot be created unless it finds an object of SessionServiceImpl.
To break the circular dependency, you have only one option. Don't extend BeanInjectionService. Rather, autowire SessionRepository directly into SessionServiceImpl.
#Service
public class SessionServiceImpl implements SessionService {
#Autowired
private SessionRepository sessionRepository;
#Override
public List<Session> findAll(){
return sessionRepository.findAll();
}
}
How come application.properties will work in a RestController, but not in a service class?
//application.properties
test=test
Works Perfect!
#RestController
public class invitecontroller {
#Autowired inviteconfig inviteconfig;
#PostMapping("/v1/invite")
public void invite(#RequestBody XXX XXX) {
System.out.println(inviteconfig);
}
}
Returns "Null"
#Service
public class inviteservice {
#Autowired inviteconfig inviteconfig;
public void invite() {
System.out.println(inviteconfig);
}
}
#Configuration
#Data
public class inviteconfig {
private String test;
}
The inviteservice class is not configured for Spring IoC (Inversion of Control) as a bean, so Spring will not handle the inviteservice class lifecycle. In this case, #Autowired is useless.
To fix this try to add #Component annotation to invitesevice, to declare it as a component:
#Component
public class inviteservice {
#Autowired inviteconfig inviteconfig;
public void invite() {
System.out.println(inviteconfig);
}
}
In the case of the controller, with #RestController, Spring will recognize your class as a Spring component.
Finally, don't forget to inject inviteservice using Spring IoC (using #Autowired annotation, or other means)
inviteservice class should be annotated with #Component or #Service
#Component
public class inviteservice {
...
Let's say I want to create a REST API which performs basic CRUD operations on several entities. For that I've created generic interface:
public interface CrudService<T>{
//generic CRUD methods
}
And its implementation for Foo entity:
#Entity
public class Foo {
}
#Repository
public interface FooRepository extends JpaRepository<Foo, Long>{
}
#Service
#Transactional
public class FooCrudServiceImpl implements CrudService{
#Autowired
private FooRepository repository;
//CRUD methods implementation
}
#RestController
class FooController{
#Autowired
private CrudService<Foo> crudService;
//Controller methods
}
What I want to avoid now is creating service implementation for each entity with basically the same logic. So I tried to create a generic service class which can be called from multiple controllers(FooController, BarController etc.):
#Service
#Transactional
class GenericCrudServiceImpl<T> implements CrudService{
#Autowired
private JpaRepository<T, Long> repository;
//generic CRUD methods implementation
}
and pass that service class to each controller where the entity type would be specified. The problem is that there will be multiple repository beans that could be injected into GenericCrudServiceImpl (FooRepository, BarRepository etc.) and just by specifying the type of JpaRepository Spring still doesn't know which bean to inject. I don't want to call repository beans directly from controller classes to maintain seperation of responsibilities.
Additionally, for some reason this problem doesn't occur on controller level where I inject CrudService interface and Spring understands which bean should it choose, which messes with my whole understanding of dependency injection.
Is there a way to create such a generic service class? Other posts on stackoverflow didn't provide me with an answer.
Bonus question: what's the difference between using a #Qualifier annotation and injecting a specific implementation (in this example FooCrudServiceImpl instead of CrudService in controller class)? In both cases pointing to different use implementation requires changing one line of code.
What about that:
#Transactional
public class GenericCrudServiceImpl<T> implements CrudService{
private JpaRepository<T, Long> repository;
public GenericCrudServiceImpl(JpaRepository<T, Long> repository) {
this.repository = repository;
}
}
And Spring configuration:
#Configuration
public PersistanceConfiguration {
#Bean
public JpaRepository<Foo, Long> fooJpaRepository() {
...
}
#Bean
public JpaRepository<Foo, Long> booJpaRepository() {
...
}
#Bean
public CrudService<Foo> fooService(JpaRepository<Foo, Long> fooJpaRepository) {
return new GenericCrudServiceImpl(fooJpaRepository);
}
#Bean
public CrudService<Foo> booService(JpaRepository<Foo, Long> booJpaRepository) {
return new GenericCrudServiceImpl(booJpaRepository);
}
}
And Controller
#RestController
class FooController{
// Injection by bean name 'fooService'
#Autowired
private CrudService<Foo> fooService;
//Controller methods
}
I have a generic repository interface called UserRepository.
I then have an interface which extends from that called MyUserRepository.
It deals with an MyUser class which extends User.
I also have a Service Interface called UserService and a class called MyUserServiceImpl.
The service wants an instance of the UserRepository and I though I could use some sort of annotation like #Qualifier but it doesn't work.
#NoRepositoryBean
public interface UserRepository <T extends User> extends JpaRepository<T, Long>{
<S extends T> S findByLoginName(String loginName);
<S extends T> S saveAndFlush(User user);
}
#Repository
#Qualifier("myUserRepository")
public interface MyUserRepository extends UserRepository<MyUser> {
}
public interface UserService {
public List<User> getUsers();
}
#Service
public class MyUserServiceImpl implements UserService {
#Autowired
#Qualifier("myUserRepository")
private UserRepository<User> userRepository;
#Override
public List<User> getUsers() {
....
}
}
APPLICATION FAILED TO START
Description:
Parameter 0 of constructor in com....services.MyUserServiceImpl
required a bean of type 'com....repositories.UserRepository' that
could not be found.
The injection point has the following annotations:
- #org.springframework.beans.factory.annotation.Autowired(required=true)
Action:
Consider defining a bean of type 'com....repositories.UserRepository'
in your configuration.
#Qualifier annotation is used only when calling a bean already created. So you shouldn't call on class head, you might name it #Repository("myUserRepository") and call it on after #Autowired #Qualifier("myUserRepository")
No need to have a qualifier in your case.
#Repository
public interface MyUserRepository extends UserRepository<MyUser> {
}
Auto-wire the repository as :
#Service
public class MyUserServiceImpl implements UserService {
#Autowired
private UserRepository<User> userRepository;
...
#Qualifier is used with #Autowired annotation. By default #Autowired will inject beans based on types.When you have multiple beans of same types then #Qualifier helps to resolve the conflict. In your case using annotation #Repository will do you job. Also in your UserRepository interface , you have to supply the Id class along with JPA entity class.
Service Component object is not loaded in Spring Batch processor.But which is working fine with Spring Testing.Please help me to find the solution for this.
public class PersonJobProcessor implements ItemProcessor<Person,Person> {
#Autowired
PersonService service;
#Override
public Person process(final Person person) throws Exception {
//user service variable here
}
}
Error Message:-
Action:Consider defining a bean of type 'PersonService' in your configuration.
Below configuration is working fine
#SpringBootTest
#RunWith(SpringRunner.class)
public class PersonServiceTest {
#Autowired
PersonService service;
public void testmethod(){
service.method();// works without issues
}
}
Looks like missing SpringContext inside PersonJobProcessor. Did you add #Component on this class?