springMVC 实体映射问题

/**
*这里是表的结构
*/

CREATE TABLE "PS"."U_BILL" (
"ID" NUMBER(11) NOT NULL ,
"BILL_NUM" VARCHAR2(16 CHAR) NULL ,
"BILL_STATUS" VARCHAR2(8 CHAR) NULL ,
"PAY_BACK_DATE" DATE NULL ,
"PAY_BACK_TIME" VARCHAR2(16 CHAR) NULL ,
"PAY_MONEY" NUMBER(25,10) NULL ,
"PAYGROUP_ID" NUMBER(25,10) NULL ,
"UUID" VARCHAR2(64 CHAR) NULL ,
"WHOCREATED" VARCHAR2(100 CHAR) NULL ,
"WHENCREATED" TIMESTAMP(6) DEFAULT SYSDATE NULL ,
"WHOMODIFIED" VARCHAR2(100 CHAR) NULL ,
"WHENMODIFIED" TIMESTAMP(6) NULL
)
LOGGING
NOCOMPRESS
NOCACHE

;

/**
*这是我的实体类代码
*/
package com.entity;

import java.math.BigDecimal;
import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

/**

• U_BILL Entity @author sjy
  */
  @Entity
  @Table(name = "U_BILL", schema = "PS")
  public class TUBill {

  private BigDecimal id;
  private String billNum;
  private String billStatus;
  private Date payBackDate;
  private double payMoney;
  private BigDecimal paygroupId;
  private String uuid;

  // Constructors

  /** default constructor */

  public TUBill() {
  super();
  }

  /** full constructor */

  public TUBill(BigDecimal id, String billNum, String billStatus,
  Date payBackDate, double payMoney, BigDecimal paygroupId,
  String uuid) {
  super();
  this.id = id;
  this.billNum = billNum;
  this.billStatus = billStatus;
  this.payBackDate = payBackDate;
  this.payMoney = payMoney;
  this.paygroupId = paygroupId;
  this.uuid = uuid;
  }

  // Property accessors

  @Id
  @Column(name = "ID", unique = true, nullable = false, precision = 11, scale = 0)
  public BigDecimal getId() {
  return id;
  }

  public void setId(BigDecimal id) {
  this.id = id;
  }

  @Column(name = "BILL_NUM", length = 16)
  public String getBillNum() {
  return billNum;
  }

  public void setBillNum(String billNum) {
  this.billNum = billNum;
  }

  @Column(name = "BILL_STATUS", length = 8)
  public String getBillStatus() {
  return billStatus;
  }

  public void setBillStatus(String billStatus) {
  this.billStatus = billStatus;
  }

  @Temporal(TemporalType.TIMESTAMP)
  @Column(name = "PAY_BACK_DATE", length = 7)
  public Date getPayBackDate() {
  return payBackDate;
  }

  public void setPayBackDate(Date payBackDate) {
  this.payBackDate = payBackDate;
  }

  @Column(name = "PAY_MONEY", precision = 25, scale = 10)
  public double getPayMoney() {
  return payMoney;
  }

  public void setPayMoney(double payMoney) {
  this.payMoney = payMoney;
  }

  @Column(name = "PAYGROUP_ID", precision = 25, scale = 10)
  public BigDecimal getPayGroupid() {
  return paygroupId;
  }

  public void setPayGroupid(BigDecimal paygroupId) {
  this.paygroupId = paygroupId;
  }

  @Column(name = "UUID", length = 64)
  public String getUuid() {
  return uuid;
  }

  public void setUuid(String uuid) {
  this.uuid = uuid;
  }

}

请教各位大神，，我运行时候报错
org.springframework.orm.hibernate4.HibernateQueryException: could not resolve property: paygroupId of: com.entity.TUBill; nested exception is org.hibernate.QueryException: could not resolve property: paygroupId of: com.entity.TUBill

这个是因为我实体映射写错了吗？还是因为数据库中的类型和实体里面的类型没匹配上？这个怎么解决啊，求指教啊~~~~~~

BigDecimal 改成double试试

http://blog.csdn.net/u013516966/article/details/42049831

啊啊啊啊，我问题解决了，折磨我一天一夜的问题啊，
解决方法：：：
大家注意了，我自己粗心，感觉payGroupId这个写法不好，改成了paygroupId，那么问题来了，这样写可以，但是他的getter和setter方法是第一次自动生成的，当该了属性名的时候，报错的几个地方改好了，！！！（关键是方法名那个地方没报错，所以没改，然后出现异常了，）

切记切记，getter和setter的方法名也要改好。
我这个错误犯的太低级了 ~~~
最后谢谢各位的耐心解答！！