Cannot resolve reference to bean ‘jpasharedem_entitymanagerfactory’ while setting bean property ‘entitymanager’

Explanation:

The error message “cannot resolve reference to bean ‘jpasharedem_entitymanagerfactory’ while setting bean property ‘entitymanager'” typically occurs when Spring is unable to find the specified bean in the application context.

To resolve this error, you need to ensure that the bean ‘jpasharedem_entitymanagerfactory’ is properly defined and available in the Spring application context.

Example:

Let’s consider an example where we have a Spring Boot application that uses JPA for database persistence. We define the EntityManagerFactory bean in a configuration class as follows:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;

import javax.persistence.EntityManagerFactory;
import javax.sql.DataSource;

@Configuration
public class JpaConfig {

    @Autowired
    private DataSource dataSource;

    @Bean
    public EntityManagerFactory entityManagerFactory() {
        LocalContainerEntityManagerFactoryBean emf = new LocalContainerEntityManagerFactoryBean();
        emf.setDataSource(dataSource);
        emf.setPackagesToScan("com.example.model");
        emf.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
        emf.afterPropertiesSet();
        return emf.getObject();
    }

}
    

In this example, we define the ‘entityManagerFactory’ bean that creates and configures the LocalContainerEntityManagerFactoryBean from Spring’s ORM package. The ‘entityManagerFactory’ bean is responsible for creating the EntityManagerFactory which provides access to the JPA functionality.

Now, let’s assume that in our application code we are trying to inject the ‘entityManager’ bean using the @Autowired annotation:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.persistence.EntityManager;

@Service
public class MyService {

    @Autowired
    private EntityManager entityManager;

    // Other methods...

}
    

In this example, the ‘entityManager’ bean is trying to be injected into the ‘MyService’ class. However, if the ‘entityManagerFactory’ bean is not available in the application context or it is defined with a different name, you will encounter the error “cannot resolve reference to bean ‘jpasharedem_entitymanagerfactory’ while setting bean property ‘entitymanager'”.

To fix this error, ensure that you have correctly defined the ‘entityManagerFactory’ bean in your application context and that it is available for autowiring. Also, make sure that the name of the ‘entityManagerFactory’ bean matches the name expected by the ‘entityManager’ property in the consuming class.