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JavaEE with Vaadin - Workshop
The document outlines an application architecture utilizing Vaadin with Java EE 7, highlighting various Java specifications, including the Java Persistence API (JPA) and Enterprise JavaBeans (EJB). It describes the structure of customer and invoice entities, as well as the use of Context and Dependency Injection (CDI) for managing dependencies within the application. Additionally, it includes interfaces and classes related to customer services and presentation logic for a web-based UI framework.
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JavaEE with Vaadin - Workshop
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- 5. Collection of JavaSpecification Requests (JSRs)
- 6. Collection of JavaSpecification Requests (JSRs) Implemented by app servers
- 9. Do you knowsome Java EE specs?
- 10. Java Persistence API 2.1(JPA) (JSR-338)
- 11. Java Persistence API 2.1(JPA) (JSR-338) Enterprise Java Beans 3.2 (EJB) (JSR-345)
- 12. Java Persistence API 2.1(JPA) (JSR-338) Enterprise Java Beans 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340)
- 13. Java Persistence API 2.1(JPA) (JSR-338) Enterprise Java Beans 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Context and Dependency Injection 1.2(CDI) (JSR-340)
- 14. Java Persistence API 2.1(JPA) (JSR-338) Enterprise Java Beans 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Context and Dependency Injection 1.2(CDI) (JSR-340) Interceptors 1.2 (JSR-318)
- 15. Java Persistence API 2.1(JPA) (JSR-338) Enterprise Java Beans 3.2 (EJB) (JSR-345) Java Servlet 3.1 (JSR-340) Context and Dependency Injection 1.2(CDI) (JSR-340) Interceptors 1.2 (JSR-318) Java Transaction API 1.2 (JTA) (JSR-907)
- 16. Java Persistence API2.1 (JPA)
- 17. Customer @Entity ______________________________ @Id @AutoGenerated Long id; @Column(nullable =false) String name; Date birthdate;
- 18. Customer @Entity ______________________________ Customer Id name birthdate 1Alex 07.02.1984 2 John 18.2.1992 @Id @AutoGenerated Long id; @Column(nullable = false) String name; Date birthdate;
- 19. Customer @Id @AutoGenerated Long id; @Column(nullable =false) String name; Date birthdate; @OneToMany(mappedBy=“customer”) List<Invoice> invoices; @Entity ______________________________ Customer Id name birthdate 1 Alex 07.02.1984 2 John 18.2.1992 Invoice Id customer number 1 1 123 2 1 124
- 20. Enterprise Java Beans3.2 (EJB)
- 21. Business layer services EnterpriseJava Beans
- 22. Business layer services @localand @remote Enterprise Java Beans
- 23. Business layer services @localand @remote Enterprise Java Beans Transaction boundaries
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- 28. @Local public interface CustomerService{ void storeCustomers(Collection<Customer> customers); void removeCustomers(Collection<Customer> customers); Collection<Customer> getAllCustomers() Optional<Customer> getCustomerByName(String name); }
- 29. @Stateless public class CustomerServiceBeanimplements CustomerService { @PersistenceContext private EntityManager em; public void storeCustomers(Collection<Customer> cu) { cu.forEach(c -> storeCustomer(c)); } public void storeCustomer(Customer c) { em.persist(c); } }
- 30. Context and Dependency Injection1.2 (CDI)
- 31. Instead of sayingnew say @Inject Context and Dependency Injection
- 32. Instead of sayingnew say @Inject Decouples code and lets container manage dependencies Context and Dependency Injection
- 33. Object references byscopes Context and Dependency Injection
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- 38. @Stateless CustomerService _________________ @EJB InvoiceService invoices; @UIScoped AppUI _________________ @EJB CustomerService service; @Inject MainMenumainMenu; @Inject User currentUser; @UIScoped MainMenu _________________ @Inject Event<MenuEvent> menuEventSource; @Stateless InvoiceService
- 39. @UIScoped AppUI _____________________________ @Inject private MainMenu menu; @Inject privateViewManager viewMgr; @Inject private User loggedInUser; <<UIScope>> MainMenu ViewManager <<SessionScope>> User
- 40. <<UIScope>> MenuBar Footer ViewManager <<SessionScope>> User @UIScoped AppUI _____________________________ @Inject private MenuBar menu; @Inject privateViewManager viewMgr; @Inject private User loggedInUser; <<UIScope>> MenuBar Footer ViewManager <<UIScope>> MenuBar Footer ViewManager <<UIScope>> MenuBar ViewManager
- 41. Integration to EEthrough Vaadin CDI
- 42. Managed UI with@CDIUI
- 43. Managed UI with@CDIUI Allows injection with @Inject and @EJB
- 44. Easily reference EEobjects Allows injection with @Inject and @EJB Managed UI with @CDIUI
- 45. @CDIUI(“”) public class AppUIextends UI { }
- 46. @CDIUI(“”) public class AppUIextends UI { @Inject private MainMenu mainMenu; @Inject private User currentUser; @Inject private ViewManager viewManager; public void init(VaadinRequest request) { VerticalLayout layout = new VerticalLayout(); layout.addComponent(mainMenu); setContent(layout); } }
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- 48. @UIScoped UI specific beanreferences
- 49. @UIScoped UI specific beanreferences CDI context for mapping beans per UI
- 50. @UIScoped UI specific beanreferences CDI context for mapping beans per UI @UIScoped
- 51. @UIScoped public class MainMenuextends CustomComponent { }
- 52. @UIScoped public class MainMenuextends CustomComponent { @Inject private Event<NavigationEvent> eventSource; protected void onMenuItemClicked(MenuItem item) { eventSource.fireEvent(new NavigationEvent(item)); } }
- 53. @CDIUI(“”) public class AppUIextends UI { … protected void onNavigationEvent(@Observes NavigationEvent event) { viewMgr.navigateTo(event.getView()); } }
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- 57. public interface CustomerViewextends ApplicationView<CustomerViewPresenter> { }
- 58. public interface CustomerViewextends ApplicationView<CustomerViewPresenter> { void populateCustomers(Collection<Customer> customers); void openEditorFor(Customer customer); void closeEditor(); void removeTableSelection(); }
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- 60. @ViewScoped public class CustomerViewPresenterextends AbstractPresenter<CustomerView> { }
- 61. @ViewScoped public class CustomerViewPresenterextends AbstractPresenter<CustomerView> { @EJB private CustomerService customerService; @Override protected void onViewEnter() { getView().populateCustomers(customerService.getAllCustomers()); } }
- 62. @ViewScoped public class CustomerViewPresenterextends AbstractPresenter<CustomerView> { @EJB private CustomerService customerService; @Override protected void onViewEnter() { getView().populateCustomers(customerService.getAllCustomers()); } public void onCustomerSaved(@Observes CustomerSavedEvent event) { … } public void onCustomerRemoved(@Observes CustomerRemovedEvent event) { … } public void onCustomerSelected(@Observes CustomerSelectedEvent event) { … } }
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- 64. @Local public interface CustomerService{ void storeCustomers(Collection<Customer> customers); void removeCustomers(Collection<Customer> customers); Collection<Customer> getAllCustomers(); Optional<Customer> getCustomerByUsername(String username); }
- 65. Application Architecture @Stateless @TransactionAttribute(TransactionAttributeType.REQUIRED) public class CustomerServiceBeanimplements CustomerService { @PersistenceContext(unitName = "appUnit") private EntityManager entityManager; @Override public void storeCustomers(Collection<Customer> customers) { customers.forEach(cu -> entityManager.merge(cu)); } @Override public Collection<Customer> getAllCustomers() { return entityManager.createQuery(query).getResultList(); } … }
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- 67. Application Architecture @Entity public class Customer{ @Id @AutoGenerated private Long id; private String name; @Temporal(DATE) private Date birthDate; public boolean isPersisted() { return id != null; } … }
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