Why AuditReader can't be Autowired in the Repository

Question

IN my springbootapp I have the following repository:-

@Repository
public class RevisionRepository {

private AuditReader auditReader;

public RevisionRepository(AuditReader auditReader) {
    this.auditReader = auditReader;
  }
}

When I run this app. I got this error:-

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2020-12-24 21:09:15 -

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APPLICATION FAILED TO START

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Description:

Parameter 0 of constructor in com.howtodoinjava.demo.repository.RevisionRepository required a bean of type 'org.hibernate.envers.AuditReader' that could not be found.

Action:

Consider defining a bean of type 'org.hibernate.envers.AuditReader' in your configuration.

How can I make this work?

Answer 1

Accepted answer didn't work for me because, after some time the application is running, it starts throwing java.net.SocketException due to connection closed.

I solved the issue by:

1. Wiring EntityManager using @PersistenceContext

2. Getting a new instance of AuditReader each time

   public class AuditRepository {
   
   @PersistenceContext
   private EntityManager entityManager;
   
   private AuditReader getAuditReader() {
       return AuditReaderFactory.get(entityManager);
   }
   
   public Optional<T> getRevision() {
       final AuditReader auditReader = getAuditReader();
       ...
   }
   

Answer 2

This fixed my issue. Hopefully, it will be helpful for others:-

@Configuration
public class RevisionConfiguration {

@Autowired
private AuditReader auditReader;

private final EntityManagerFactory entityManagerFactory;

public RevisionConfiguration(EntityManagerFactory entityManagerFactory) {
    this.entityManagerFactory = entityManagerFactory;
}

@Bean
AuditReader auditReader() {
    return AuditReaderFactory.get(entityManagerFactory.createEntityManager());
  }
}