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In-Depth Information
The methods of UserManager EJB are as follows:
getMegaUser : Retrieves the user information. It throws UserNotFound exception if the target
user is not found.
registerMegaUser : Registers the Mega App user in the Mega App database as an application
user (i.e., it makes the user a member in the "User" group). It throws UserAlreadyExists
exception if the user ID already exists in the database.
removeMegaUser : Removes the Mega App user from the database. It throws UserNotFound
exception if the target user is not found.
retrieveMegaUsers : Retrieves all the users of the Mega App (whether they are normal users or
administrator users).
Let's check the details of MegaUser JPA entity, which holds the User attributes and its associated validation
constraints. Listing 13-9 shows MegaUser JPA entity class.
Listing 13-9. MegaUser JPA Entity Class
package com.jsfprohtml5.megaapp.model;
import java.util.List;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.Transient;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
@Table(name = "MEGA_USER")
public class MegaUser implements Serializable {
private static final long serialVersionUID = 109890766546456L;
@Basic(optional = false)
@Size(min = 3, max = 64, message = "ID must be between 3 and 64 characters")
@Column(name = "ID")
private String id;
@Basic(optional = false)
@Size(min = 3, max = 32, message = "First name must be between 3 and 32 characters")
@Column(name = "FIRST_NAME")
private String firstName;
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