Java EE 8 Design Patterns and Best Practices

Implementing the EmployeeBusiness class

The EmployeeBusiness class has the employee business logic:

import javax.ejb.Stateless;import javax.inject.Inject;import java.util.Optional;@Statelesspublic class EmployeeBusiness{   @Inject @Persistence   protected PersistenceManager persistenceManager;   public boolean save ( Employee employee ) throws Exception {               //Begin Transaction        persistenceManager.begin();       persistenceManager.persist(employee);       //End Transaction       persistenceManager.commit();              return true;   }   public Optional<Employee> findById(Employee employee ){        return Optional.ofNullable( (Employee) persistenceManager.load(employee.getId()).get());    }}

In the preceding code block, we have the EmployeeBusiness class, which has the employee business ...