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我試圖實現自定義註釋,因爲它寫在這個post,但出了點問題。當我試圖在dataBase中堅持我的實體時,它會用我的自定義註釋來無限檢查字段。我使用wildfly 9.0.2無限檢查自定義JSR303註釋
代碼:
實體:
@Entity
@Table(name = "users")
@NamedQueries({
@NamedQuery(name = User.FIND_BY_LOGIN_AND_USERNAME,query = "SELECT u FROM User u WHERE u.userName = :username and u.password = :password"),
@NamedQuery(name = User.FIND_USER_BY_USERNAME,query = "SELECT u FROM User u WHERE u.userName = :username")
})
public class User implements Serializable{
public static final String FIND_BY_LOGIN_AND_USERNAME = "findByLoginAndPassword";
public static final String FIND_USER_BY_USERNAME = "findUserByUsername";
@Id
@GeneratedValue
private Long id;
@NotNull
@Size(min = 3,max = 64,message = "{model.User.login.message}")
@Username
@Column(name = "user_name",nullable = false,unique = true)
private String userName;
//...other fields...
//...constructors, getters and setters...
}
譯註:
@Constraint(validatedBy = UsernameValidator.class)
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD,ElementType.METHOD,ElementType.ANNOTATION_TYPE})
public @interface Username {
String message() default "Username already exists";
Class<?>[] groups() default {};
Class<? extends Payload>[] payload() default {};
}
驗證:
public class UsernameValidator implements ConstraintValidator<Username, String> {
@Inject
UserManager userManager;
@Override
public void initialize(Username constraintAnnotation) {
}
@Override
public boolean isValid(String username, ConstraintValidatorContext context) {
boolean isValid = !userManager.userExist(username);
return isValid;
}
}
的UserManager:
@Stateless
public class UserManager {
@PersistenceContext(unitName = "MySqlPU")
EntityManager em;
public void persist(User user){
em.persist(user);
}
public User findUserByLoginAndPassword(String username, String password) {
try {
return em.createNamedQuery(User.FIND_BY_LOGIN_AND_USERNAME, User.class)
.setParameter("username",username)
.setParameter("password",password)
.getSingleResult();
} catch (NoResultException e){
return null;
}
}
public boolean userExist(String username) {
try {
em.createNamedQuery(User.FIND_USER_BY_USERNAME, User.class)
.setParameter("username", username)
.getSingleResult();
} catch (NoResultException e) {
return false;
}
return true;
}
}
鏈接server.log(snip2code)
預先感謝您!
你說你正在進入一個無限循環。這是否意味着你必須殺死這個過程?或者,此錯誤是否出現在持久存儲的日誌中,並且服務器繼續運行? – Hardy
服務器停止響應,我所能做的就是終止服務器進程。 –
@MaxMax JPA規範指出,不要在entitylistener中調用另一個db調用,否則會導致無限循環。我想這也適用於約束驗證,因爲它們也在jpa事務中執行,另一個db調用將導致再次調用相同的約束驗證程序。 – maress