Hibernate的顯示錯誤，類沒有映射

我創建了一個DAO類，實體和所有的Hibernate配置，但是Hibernate的不斷出現同樣的錯誤：Hibernate的顯示錯誤，類沒有映射

QuerySyntaxException: StudentEntity is not mapped [SELECT s FROM StudentEntity s]

哪裏是我的錯？

表腳本

CREATE TABLE student(
    id int(3) NOT NULL, 
    firstName varchar(20) NOT NULL, 
    age int(2) NOT NULL, 
    CONSTRAINT id_pk PRIMARY KEY (id) 
); 

INSERT INTO student VALUES ('101','yashik','23'); 

SELECT * FROM student;

實體類

package com.demo.entity; 
import javax.persistence.Entity; 
import javax.persistence.Id; 
import javax.persistence.Table; 

@Entity 
@Table(name="student") 
public class StudentEntity { 
    @Id 
    private int id; 
    private String firstName; 
    private int age; 
    //getter and setter

DAO類

package com.demo.dao; 
import java.util.List; 
import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.query.Query; 
import com.demo.entity.StudentEntity; 
import com.demo.resources.HibernateUtility; 
public class StudentDAOImpl implements StudentDAO { 
    @Override 
    public StudentEntity getStudent(Integer studentID) { 
    SessionFactory sessionFactory=HibernateUtility.createSessionFactory(); 
    Session s1=null; 
    StudentEntity stu=null; 
    s1=sessionFactory.openSession(); 
    s1.beginTransaction(); 
    String st1="SELECT s FROM StudentEntity s"; 
    Query q1=s1.createQuery(st1); 
    List<StudentEntity> l1=q1.list(); 
    stu.setAge(l1.get(0).getAge()); 
    stu.setId(l1.get(0).getId()); 
    stu.setFirstName(l1.get(0).getFirstName()); 
    if (s1 != null) { 
     s1.close(); 
    } 
    return stu; 
    } 
}

Hibernate工具

package com.demo.resources; 

import org.hibernate.SessionFactory; 
import org.hibernate.boot.registry.StandardServiceRegistryBuilder; 
import org.hibernate.cfg.Configuration; 
import org.hibernate.service.ServiceRegistry; 

public class HibernateUtility { 

    private static final String CONFIGURATION_LOCATION="com/demo/resources/hibernate.cfg.xml"; 
    private static SessionFactory sessionFactory=getSessionFactory(); 

    public static SessionFactory getSessionFactory() { 
     if (sessionFactory == null) { 
      // loads configuration and mappings 
      Configuration configuration = new Configuration().configure(CONFIGURATION_LOCATION); 
      ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder() 
        .applySettings(configuration.getProperties()).build(); 

      // builds a session factory from the service registry 
      sessionFactory = configuration.buildSessionFactory(serviceRegistry); 
     } 

     return sessionFactory; 
    } 
    public static SessionFactory createSessionFactory(){ 
     return getSessionFactory(); 
    } 
    public static void closeSessionFactory(){ 
     if(!sessionFactory.isClosed()){ 
      sessionFactory.close(); 
     } 
    } 
}

的hibernate.cfg.xml

<?xml version="1.0" encoding="utf-8"?> 
<!DOCTYPE hibernate-configuration SYSTEM "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> 

<hibernate-configuration> 
    <session-factory> 
     <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> 
     <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> 
     <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/rmc</property> 
     <property name="hibernate.connection.username">root</property> 
     <property name="hibernate.connection.password">******</property> 
     <property name="show_sql">true</property> 
     <property name="connection.pool_size">1</property> 

     <mapping class="com.demo.entity.StudentEntity"></mapping> 
    </session-factory> 
</hibernate-configuration>

錯誤信息

Jul 06, 2016 10:06:18 PM org.hibernate.Version logVersion 
INFO: HHH000412: Hibernate Core {5.2.0.Final} 
Jul 06, 2016 10:06:18 PM org.hibernate.cfg.Environment <clinit> 
INFO: HHH000206: hibernate.properties not found 
Jul 06, 2016 10:06:18 PM org.hibernate.cfg.Environment buildBytecodeProvider 
INFO: HHH000021: Bytecode provider name : javassist 
Jul 06, 2016 10:06:19 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit> 
INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final} 
Jul 06, 2016 10:06:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure 
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!) 
Jul 06, 2016 10:06:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator 
INFO: HHH10001005: using driver [com.mysql.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/rmc] 
Jul 06, 2016 10:06:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator 
INFO: HHH10001001: Connection properties: {user=root, password=****} 
Jul 06, 2016 10:06:19 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator 
INFO: HHH10001003: Autocommit mode: false 
Jul 06, 2016 10:06:19 PM org.hibernate.engine.jdbc.connections.internal.PooledConnections <init> 
INFO: HHH000115: Hibernate connection pool size: 1 (min=1) 
Wed Jul 06 22:06:19 IST 2016 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification. 
Jul 06, 2016 10:06:19 PM org.hibernate.dialect.Dialect <init> 
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect 
Jul 06, 2016 10:06:19 PM org.hibernate.hql.internal.QueryTranslatorFactoryInitiator initiateService 
INFO: HHH000397: Using ASTQueryTranslatorFactory 
Exception in thread "main" java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: StudentEntity is not mapped [SELECT s FROM StudentEntity s] 
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:131) 
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:155) 
    at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:162) 
    at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:633) 
    at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:101) 
    at com.demo.dao.StudentDAOImpl.getStudent(StudentDAOImpl.java:22) 
    at com.demo.userInterface.UserInterface.main(UserInterface.java:9) 
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: StudentEntity is not mapped [SELECT s FROM StudentEntity s] 
    at org.hibernate.hql.internal.ast.QuerySyntaxException.generateQueryException(QuerySyntaxException.java:79) 
    at org.hibernate.QueryException.wrapWithQueryString(QueryException.java:103) 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:218) 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:142) 
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:115) 
    at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:77) 
    at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:152) 
    at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:523) 
    at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:625) 
    ... 3 more 
Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: StudentEntity is not mapped 
    at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:171) 
    at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:91) 
    at org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:79) 
    at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:321) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3704) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3593) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:718) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:574) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:311) 
    at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:259) 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:262) 
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:190) 
    ... 9 more

來源

2016-07-06 Yashik

你可以更改String st1 =「SELECT s FROM StudentEntity s」; to String st1 =「FROM StudentEntity」;並嘗試 –

不是這不工作，它會產生相同的錯誤。謝謝 – Yashik

歡迎來到Stack Overflow！我編輯了一下你的問題，把焦點放在完整的錯誤信息上，就在開始。所以我刪除了一些介紹性文字，這些文字並沒有真正幫助讀者快速理解您的問題。 – trincot

String st1="SELECT s FROM StudentEntity s";

在此你想獲得的所有數據在實體，如果我是正確的。

我通常使用

字符串ST1 = 「從StudentEntity」;

就是這樣，告訴它是否有效。

來源

2017-09-19 17:43:27

Hibernate的顯示錯誤，類沒有映射

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