JavaBeansの継承について

JabaBeansの継承についての質問です。
「UserBean.java」を継承した「CreateUserBean.java」を作ったのですが、後者からでは前者のフィールドにアクセスできないというエラーが出てしまいました。
どのような修正を加えれば、後者から前者のフィールドにアクセスが可能な状態に変更できるのでしょうか。
ご教授よろしくお願いいたします。

UserBean.java

package la.bean;
import java.io.Serializable;
import java.util.Date;
import la.common.StringToSqlDate;
public class UserBean implements Serializable{
	private int userId;        	 //会員ID
	private String userName;   	 //会員の名前
	private String userPost;	 	 //会員の郵便番号
	private String userAddress;     //会員の住所
	private String userTel;          //会員の電話番号
	private String userEmail;        //会員のEメールアドレス
	private String userPassword;     //会員のパスワード
	private Date userBirthday;     //会員の生年月日
	private Date joinDate;         //会員の入会年月日
	private Date leaveDate;        //会員の退会年月日


	public UserBean(int userId, String userName, String userPost, String userAddress, String userTel,
					String userEmail, String userPassword, Date userBirthday, Date joinDate, Date leaveDate) {
		this.userId = userId;
		this.userName = userName;
		this.userPost = userPost;
		this.userAddress = userAddress;
		this.userTel = userTel;
		this.userEmail = userEmail;
		this.userPassword = userPassword;
		this.userBirthday = userBirthday;
		this.joinDate = joinDate;
		this.leaveDate = leaveDate;
	}

	//デフォルトコンストラクタ
	public UserBean() {
	}

	public int getUserId() {
		return userId;
	}
	public void setUserId(int userId) {
		this.userId = userId;
	}

	public String getUserName() {
		return userName;
	}
	public void setUserName(String userName) {
		this.userName = userName;
	}

	public String getUserPost() {
		return userPost;
	}
	public void setUserPost(String userPost) {
		this.userPost = userPost;
	}

	public String getUserAddress() {
		return userAddress;
	}
	public void setUserAddress(String userAddress) {
		this.userAddress = userAddress;
	}

	public String getUserTel() {
		return userTel;
	}
	public void setUserTel(String userTel) {
		this.userTel = userTel;
	}

	public String getUserEmail() {
		return userEmail;
	}
	public void setUserEmail(String userEmail) {
		this.userEmail = userEmail;
	}

	public String getUserPassword() {
		return userPassword;
	}
	public void setUserPassword(String userPassword) {
		this.userPassword = userPassword;
	}

	public Date getUserBirthday() {
		return userBirthday;
	}
	public void setUserBirthday(Date userBirthday) {
		this.userBirthday = userBirthday;
	}

	public Date getJoinDate() {
		return joinDate;
	}
	public void setJoinDate(Date joinDate) {
		this.joinDate = joinDate;
	}

	public Date getLeaveDate() {
		return leaveDate;
	}
	public void setLeaveDate(Date leaveDate) {
		this.leaveDate = leaveDate;
	}


	public void setSqlUserBirthday(String birthYear, String birthMonth, String birthDay) {
		this.userBirthday = StringToSqlDate.convertDate(birthYear,birthMonth,birthDay);
	}

	public void setSqlJoinDate(String joinYear, String joinMonth, String joinDay) {
		this.joinDate = StringToSqlDate.convertDate(joinYear, joinMonth, joinDay);
	}
	public void setSqlLeaveDate(String leaveYear, String leaveMonth, String leaveDay) {
		this.leaveDate = StringToSqlDate.convertDate(leaveYear, leaveMonth, leaveDay);
	}
}

CreateUserBean.java

package la.bean;
import java.io.Serializable;
import java.sql.Date;

public class CreateUserBean extends UserBean implements Serializable{


	private String userPassword2;     //会員のパスワード確認用



	public CreateUserBean(int userId, String userName, String userPost, String userAddress, String userTel,
			String userEmail, String userPassword, Date userBirthday, Date joinDate, Date leaveDate,String userPassword2) {

		this.userPassword2 = userPassword2;
	}


	public String getUserPassword2() {
		return userPassword2;
	}
	public void setUserPassword2(String userPassword2) {
		this.userPassword2 = userPassword2;
	}


	//登録用コンストラクタ
	public CreateUserBean(String userName,String userPost, String userAddress, String userTel,
			String userEmai, Date userBirthday, String userPassword) {
	this.userName=userName;
	this.userPost=userPost;
	this.userAddress=userAddress;
	this.userTel=userTel;
	this.userEmail=userEmail;
	this.userBirthday=userBirthday;
	this.userPassword=userPassword;
	}



	//デフォルトコンストラクタ
	public CreateUserBean() {
	}

}
コード