There is no applicationContext.xml file. 

• Too much XML
• Namespaces helped
• Enter Java Configuration

Create main/java/com.pluralsight/AppConfig.java:

 

1. Setter Injection: 

package com.pluralsight;import com.pluralsight.repository.CustomerRepository;import com.pluralsight.repository.HibernateCustomerRepositoryImpl;import com.pluralsight.service.CustomerService;import com.pluralsight.service.CustomerServiceImpl;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class AppConfig {    @Bean(name = "customerService")    public CustomerService getCustomerService() {        CustomerServiceImpl service = new CustomerServiceImpl();        // Setter Injection        service.setCustomerRepository(getCustomerRepository());        return service;    }    @Bean(name = "customerRepository")    public CustomerRepository getCustomerRepository () {        return new HibernateCustomerRepositoryImpl();    }}

 

Setter Injection for Service:

package com.pluralsight.service;import com.pluralsight.model.Customer;import com.pluralsight.repository.CustomerRepository;import org.springframework.stereotype.Service;import java.util.List;@Service("customerService")public class CustomerServiceImpl implements CustomerService {    private CustomerRepository customerRepository;    // Setter Injection    public void setCustomerRepository(CustomerRepository customerRepository) {        this.customerRepository = customerRepository;    }    @Override    public List
     
       findAll() {        return customerRepository.findAll();    }}
     

 

 

2. Constructor Injection: 

package com.pluralsight;import com.pluralsight.repository.CustomerRepository;import com.pluralsight.repository.HibernateCustomerRepositoryImpl;import com.pluralsight.service.CustomerService;import com.pluralsight.service.CustomerServiceImpl;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;@Configurationpublic class AppConfig {    @Bean(name = "customerService")    public CustomerService getCustomerService() {        CustomerServiceImpl service = new CustomerServiceImpl(getCustomerRepository());        return service;    }    @Bean(name = "customerRepository")    public CustomerRepository getCustomerRepository () {        return new HibernateCustomerRepositoryImpl();    }}

 

package com.pluralsight.service;import com.pluralsight.model.Customer;import com.pluralsight.repository.CustomerRepository;import org.springframework.stereotype.Service;import java.util.List;@Service("customerService")public class CustomerServiceImpl implements CustomerService {    private CustomerRepository customerRepository;    // Constructor Injection    public CustomerServiceImpl(CustomerRepository customerRepository) {        this.customerRepository = customerRepository;    }    @Override    public List
     
       findAll() {        return customerRepository.findAll();    }}
     

 

 

3. Autowired:

It would be good to add @Service and @Repository to each java files:

@Service("customerService")public class CustomerServiceImpl implements CustomerService {

@Repository("customerRepository")public class HibernateCustomerRepositoryImpl implements CustomerRepository {

Add @ComponentScan({"com.pluralsight"}) to the AppConfig.java:

package com.pluralsight;import com.pluralsight.repository.CustomerRepository;import com.pluralsight.repository.HibernateCustomerRepositoryImpl;import com.pluralsight.service.CustomerService;import com.pluralsight.service.CustomerServiceImpl;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.ComponentScan;import org.springframework.context.annotation.Configuration;@Configuration@ComponentScan({
    "com.pluralsight"})public class AppConfig {/*    @Bean(name = "customerService")    public CustomerService getCustomerService() {        CustomerServiceImpl service = new         return service;    }    @Bean(name = "customerRepository")    public CustomerRepository getCustomerRepository () {        return new HibernateCustomerRepositoryImpl();    }*/}

The prower of Autowired is that, we don't need to define any @Bean in AppConfig.