为什么我无法捕获 EJB 异常?
我似乎无法在我的 java ee 6 项目中捕获 NoResultException 或 EJBException 等异常。我做错了什么吗?我在 EJB 容器之外捕获了异常,但这是我第一次使用 EJB。谢谢。
@Stateless
public class UserEJB {
@PersistenceContext
EntityManager em;
public String getUserName(User user) {
return user.getName();
}
public User fetchUserByEmail(String email) {
User user = em.createNamedQuery("User.findByEmail", User.class).setParameter("email", email).getSingleResult();
return user;
}
public User fetchUserById(int id) {
return em.createNamedQuery("User.findByUserId", User.class).setParameter("userId", id).getSingleResult();
}
public List<User> fetchAllUsers() {
return em.createNamedQuery("User.findAll", User.class).getResultList();
}
}
@Named(value = "userController")
@RequestScoped
public class UserController {
private User user = new User();
@EJB
UserEJB userEJB;
@Inject
SecurityController securityController;
public UserController() {
}
public void login(ActionEvent event) {
try {
User userLogin = userEJB.fetchUserByEmail(user.getEmail());
} catch (Exception e) {
}
if (userLogin.getPassword().equals(user.getPassword())) {
securityController.setIsLoggedIn(true);
securityController.setIsAdmin(true);
securityController.setUser(user);
}
}
/**
* @return the user
*/
public User getUser() {
return user;
}
/**
* @param user the user to set
*/
public void setUser(User user) {
this.user = user;
}
I can't seem to catch exceptions such as NoResultException or EJBException in my java ee 6 project. Is there something I am doing wrong? I have caught exceptions outside the EJB container but this is my first time using EJB. Thanks.
@Stateless
public class UserEJB {
@PersistenceContext
EntityManager em;
public String getUserName(User user) {
return user.getName();
}
public User fetchUserByEmail(String email) {
User user = em.createNamedQuery("User.findByEmail", User.class).setParameter("email", email).getSingleResult();
return user;
}
public User fetchUserById(int id) {
return em.createNamedQuery("User.findByUserId", User.class).setParameter("userId", id).getSingleResult();
}
public List<User> fetchAllUsers() {
return em.createNamedQuery("User.findAll", User.class).getResultList();
}
}
@Named(value = "userController")
@RequestScoped
public class UserController {
private User user = new User();
@EJB
UserEJB userEJB;
@Inject
SecurityController securityController;
public UserController() {
}
public void login(ActionEvent event) {
try {
User userLogin = userEJB.fetchUserByEmail(user.getEmail());
} catch (Exception e) {
}
if (userLogin.getPassword().equals(user.getPassword())) {
securityController.setIsLoggedIn(true);
securityController.setIsAdmin(true);
securityController.setUser(user);
}
}
/**
* @return the user
*/
public User getUser() {
return user;
}
/**
* @param user the user to set
*/
public void setUser(User user) {
this.user = user;
}
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如果在代码中放入两个 System.out.println 会怎样?一个位于异常处理程序中,另一个位于 if 语句之前。你得到什么?
查看代码,我会说您将能够捕获该异常,该异常应该是包装在 EJB 异常中的 JPA 异常。
What if you put two System.out.printlns in the code? One in the exception handler and one right before the if statement. What do you get?
Looking at the code I would say you would be able to catch the exception, which should be a JPA exception wrapped in an EJB one.