"@Service" classes should not have communication-related members

A cleanly coded web application will have a clear separation of concerns, with business logic in the @Service layer, and communication with other systems in the data access layer.

To help enforce such a separation of concerns, this rule raises an issue when a @Service class has RestTemplate, JmsTemplate, WebServiceTemplate, JdbcTemplate, or DataSource member.

Noncompliant Code Example

@Service ("greetingmanager")
public class GreetingManagerImpl implements GreetingManager
{
    @Autowired
    DataSource ds;  // Noncompliant

Compliant Solution

@Service ("greetingmanager")
public class GreetingManagerImpl implements GreetingManager
{
    @Autowired
    GreetingDao gdao;  // DataSource and its use have been moved here