This image shows the sequence of events that occurs when you query for information about an employee.

• The application sends the request to the Controller servlet.
• The Controller invokes the getInstance and createActionHandler methods on the ActionHandlerFactory, and the performAction method on the QueryEmployee.
• If the employee ID is invalid, QueryEmployee forwards the request to a JSP error page, which returns an error response to the client.
• If the employee ID is valid, QueryEmployee forwards the request to the queryEmployee JSP.
• The queryEmployee JSP calls getEmployeeManager on the SessionHelper bean and getEmployeeDetails on the EmployeeManager bean.
• The EmployeeManager then calls getEmployee, which in turn calls findByPrimaryKey on the Employee entity bean.
• The Employee entity bean calls new, findByPrimaryKey, and load on EmployeeDAOImpl.
• EmployeeDAOImpl calls new and setBenefits on MutableEmployeeModel, and calls new on BenefitItem.
• EmployeeManager now calls getDetails on Employee, which returns an EmployeeModel.
• When all of the information is gathered, the application passes it back to the queryEmployee JSP, which returns the information to the client.