I am using spring boot vaadin project.I have a repository like this:public interface PersonneRepository extends JpaRepository<Person, Integer>, JpaSpecificationExecutor {}
I want to instantiate this repository in my class .In Ui and in Views I do this: @Autowired PersonneRepository repo; this work easily but in simple class(public class x{}) repo return null .And I don't like to passe it in parameter or session .Have you any idea please?
To inject dependencies the dependent classes have to be managed by Spring. This can be achieved with the class annotation @Component:
Indicates that an annotated class is a "component". Such classes are considered as candidates for auto-detection when using annotation-based configuration and classpath scanning.
For use in Vaadin classes @SpringComponent it's recommended:
Alias for {@link org.springframework.stereotype.Component} to prevent conflicts with {@link com.vaadin.ui.Component}.
Example:
@Repository // Indicates that an annotated class is a "Repository", it's a specialized form of @Component
public interface PersonRepository extends JpaRepository<Person, Long> {
// Spring generates a singleton proxy instance with some common CRUD methods
}
@UIScope // Implementation of Spring's {@link org.springframework.beans.factory.config.Scope} that binds the UIs and dependent beans to the current {@link com.vaadin.server.VaadinSession}
@SpringComponent
public class SomeVaadinClassWichUsesTheRepository {
private PersonRepository personRepository;
@Autowired // setter injection to allow simple mocking in tests
public void setPersonRepository(PersonRepository personRepository) {
this.personRepository = personRepository;
}
/**
* The PostConstruct annotation is used on a method that needs to be executed after dependency injection is done to perform any initialization.
*/
@PostConsruct
public init() {
// do something with personRepository, e.g. init Vaadin table...
}
}
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