[hibernate] org.springframework.orm.hibernate3.HibernateQueryException: Manager is not mappe

用hibernateTemplate().find()方法时出现以下错误

org.springframework.orm.hibernate3.HibernateQueryException: Manager is not mapped [from Manager]; nested exception is org.hibernate.hql.ast.QuerySyntaxException: Manager is not mapped [from Manager]

纠结了好长时间，上网一查才知道好多人出现过相同问题，原因一般有：

1，hbm.xml 没在beans.xml中配置

<property name="packagesToScan">

<list><value>com.fzb.shop.entity</value></list> 

 </property>

2，find（）方法中的类名大小写

因为Hibernate是对类查询的
在hql="select * from user u where u.username='"+username+"' and u.password='"+password+"'中,
user是数据库中的表,而user对应的类是User.java,现在只需要将from user改为from User,同时不用在出现select *即可

3.User.java中 Entity包引用是否出错。

package com.kent.ssh.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;

@Entity
public class User {
    private int id;
    private String username;
    private String password;
   
    @Id
 @GeneratedValue
 public int getId() {
  return id;
 }
 public void setId(int id) {
  this.id = id;
 }
 public String getUsername() {
  return username;
 }
 public void setUsername(String username) {
  this.username = username;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }
    
   
}