错误：抽象模式类型未知

我不明白为什么我得到这个错误：错误：抽象模式类型未知

//EX[2,1,["java.lang.IllegalArgumentException/1755012560", 
"An exception occurred while creating a query in EntityManager: 
\r\nException Description: Problem compiling [SELECT u FROM Users u]. \n[14, 19] 
The abstract schema type \x27Users\x27 is unknown."],0,7]

它看起来像所有的configs是正确的，但尽管如此，我得到这个错误。请帮忙。我CONFIGS低于：

MySQL表：

CREATE TABLE `users` (
    `USER_ID` int(10) unsigned NOT NULL AUTO_INCREMENT, 
    `USERNAME` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, 
    `PASSWORD` varchar(45) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL, 
    `ENABLED` tinyint(1) NOT NULL, 
    `firstname` varchar(50) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL, 
    `lastname` varchar(50) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL, 
    `email` varchar(50) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL, 
    PRIMARY KEY (`USER_ID`) 
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8

实体：

package com.val.dogovora.entity; 
import javax.persistence.*; 
import java.io.Serializable; 
@Entity 
public class Users implements Serializable { 
    @Id 
    @GeneratedValue(strategy= GenerationType.IDENTITY) 
    private int USER_ID; 
    private String USERNAME; 
    private String PASSWORD; 
    private int ENABLED; 
    private String firstname; 
    private String lastname; 
    private String email; 

    public Users() { 
    } 
    public Users(String USERNAME, String PASSWORD, int ENABLED, String firstname, String lastname, String email) { 
     this.USERNAME = USERNAME; 
     this.PASSWORD = PASSWORD; 
     this.ENABLED = ENABLED; 
     this.firstname = firstname; 
     this.lastname = lastname; 
     this.email = email; 
    } 
Getters and Setters... 
}

的persistence.xml

<class>com.val.dogovora.entity.Users</class>

代码：

EntityManagerFactory emf = Persistence.createEntityManagerFactory("DogovoraPool"); 
EntityManager em = emf.createEntityManager(); 
TypedQuery<Users> query = em.createQuery("SELECT u FROM Users u", Users.class);

来源

2013-09-26 zigfridus

我想我找到了我的错误的原因。在将我的项目从Eclipse转换为Intellij Idea之前。文件夹my_project_name/war/web-if/classes保留旧文件。我删除了这个文件夹，现在我的项目没有任何错误。但我不明白，为什么Intellij Idea会使用这些旧类，如果它有自己的文件夹my_project_name/out？

来源

2013-09-27 07:15:59 zigfridus

错误：抽象模式类型未知

回答

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