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POSuggest a design pattern for application using JSF , EJB 3.0
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  1. POSuggest a design pattern for application using JSF , EJB 3.0
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    copied!<p>i have created a demo application Using JSF &amp; EJB 3.0 (Stateless session bean and JPA), my persistence provider is Hibernate 4, and database is Apache Derby.</p> <p>My class flow i.e sequential flow is as follows,</p> <p>ManagedBean calls Stateless Session bean, in this we have a JPA calls,</p> <p>please follow the code, the JSF managed bean StudentMgBean.java,</p> <pre><code>@ManagedBean(name="stMgBean") @ViewScoped public class StudentMgBean implements Serializable{ private static final long serialVersionUID = 109117543434170143L; ........... @EJB private StudentService studentService; ......... @PostConstruct public void init(){ .......... ........ this.totalStudentInDB = studentService.getMaxStudent(); } } </code></pre> <p>My EJB Interface StudentService.java,</p> <pre><code>@Local public interface StudentService { List&lt;StudentVO&gt; fetchStudentListOrderByStudentId(boolean flag); List&lt;StudentVO&gt; fetchStudentListOrderByStudentName(boolean flag); void saveStudentEntity(StudentEntity studentEntity,Integer deptId) throws Exception; List&lt;DeptEntity&gt; fetchAllDept(); List&lt;StudentVO&gt; fetchStudentByDept(Integer deptId); void saveAllStudents(List&lt;StudentVO&gt; students) throws Exception; void deleteAllStudents(List&lt;StudentVO&gt; students) throws Exception; List&lt;StudentVO&gt; fetchStudentListPerPage(Integer minRow,Integer maxRow) throws Exception; Integer getMaxStudent() throws Exception; } </code></pre> <p>My EJB Stateless Session bean StudentServiceBean.java,</p> <pre><code>@Stateless @TransactionManagement(TransactionManagementType.CONTAINER) public class StudentServiceBean implements StudentService{ @PersistenceContext(unitName="forPractise") private EntityManager entityMgr; @Resource private SessionContext sessionContext; @EJB private DeptService deptService; @Override public List&lt;StudentVO&gt; fetchStudentListOrderByStudentId(boolean flag){ ......... } @Override @TransactionAttribute(TransactionAttributeType.REQUIRED) public void saveStudentEntity(StudentEntity studentEntity,Integer deptId) throws Exception{ ........ } } </code></pre> <p>In the StudentServiceBean, i have injected EntityManager, so i directly do JPA operation in the methods written in this session bean.</p> <p>No my question is can i use any design pattern in this flow, can i go for a separate DAO layer, as i am using EJB 3.0 i don't have to use ServiceLocator pattern, but than any other pattern can i use to seperate Bussiness logic with the JPA call,</p> <p>One more thing, In JSF managed Bean i have properties and its getter setter methods which are mapped to the JSP componenets in EL like this value={stMgBean.studentList}</p> <p>but in the same managed bean i have also have method which will be invocked by action command call from JSF, should those method be written in the seperate Managed bean ?</p> <p>Please suggest a Design pattern which can be used for projects which have JSF 2.0, EJB 3.0 and JPA</p> <p>Waiting for the reply</p>
 

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