User.java

package org.krams.domain;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;

@Entity(name="user")
public class User {
	
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private Long id;
	
	private String firstName;
	private String lastName;
	
	@Column(unique=true)
	private String username;
	private String password;
	
	@OneToOne(mappedBy="user", cascade={CascadeType.ALL})
	private Role role;

	public User() {}
	
	public User(String username, String password, String firstName, String lastName, Role role) {
		this.username = username;
		this.password = password;
		this.firstName = firstName;
		this.lastName = lastName;
		this.role = role;
	}
	
	public User(String username, String firstName, String lastName, Role role) {
		this.username = username;
		this.firstName = firstName;
		this.lastName = lastName;
		this.role = role;
	}

	public User(String username) {
		this.username = username;
	}
	
	...getters/setters
}