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问MappingException (Hibernate)
EN

Stack Overflow用户
提问于 2021-02-25 17:42:25
回答 2查看 314关注 0票数 0

“无法获取org.hibernate.persister.entity.SingleTableEntityPersister的构造函数”

我没有使用任何maven或类似的工具，也没有手动添加和引用库。我已经浏览了之前发布的所有类似问题，并包含了可能需要包含的所有相关库。我正在使用Java 1.8，Hibernate 5，具有相同的遵从性级别。所有的getter和setter也都存在并得到了验证。无法确定导致this.PLEASE的原因请不要标记此副本，如果您认为我遗漏了任何可能的解决方案，请在评论中让我知道

Student.java

代码语言：javascript
复制
package com.vv.hibernate.demo.entity;

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

@Entity
@Table(name="student")
public class Student {
    public Student() {
    }
    
    @Id
    @Column(name="id")
    private int id;
    
    @Column(name="first_name")
    private String firstName;
    
    @Column(name="last_name")
    private String lastName;
    
    @Column(name="email")
    private String email;

    public Student(String firstName, String lastName, String email) {
        super();
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }

    public int getId() {
        return id;
    }

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

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Student [id=" + id + ", firstName=" + firstName + ", lastName=" + lastName + ", email=" + email + "]";
    }
        
}

CreateStudentDemo.java(主文件)

代码语言：javascript
复制
package com.vv.hibernate.demo;

import org.hibernate.MappingException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import com.vv.hibernate.demo.entity.Student;

public class CreateStudentDemo {

    public static void main(String[] args) throws org.hibernate.MappingException {
        SessionFactory sessionFactory;
        try {
            StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder()
                    .configure("hibernate.cfg.xml").build();
            Metadata metaData = new MetadataSources(standardRegistry)
            .addAnnotatedClass(Student.class)
//          .addAnnotatedClassName( "com.vv.hibernate.demo.entity" )
                    .getMetadataBuilder().build();
            sessionFactory = metaData.getSessionFactoryBuilder()
                    .build();
        } catch (Exception e) {
            System.out.println("Initial SessionFactory creation failed");
            e.printStackTrace();
            return;
        }

        try(Session session = sessionFactory.openSession()) {
            Student student = new Student("a", "b", "a@b.com");
            session.beginTransaction();
            session.save(student);
            session.getTransaction().commit();
            System.out.println("Transaction completed");
            session.close();
        } 
        catch (MappingException exception) {
            System.out.println("Problem creating session factory");
            exception.printStackTrace();
        } 

    }

}

hibernate.cfg.xml

代码语言：javascript
复制
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

    <session-factory>

        <!-- JDBC Database connection settings -->
        <property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/hb_student_tracker?useSSL=false&amp;serverTimezone=UTC</property>
        <property name="connection.username">hbstudent</property>
        <property name="connection.password">hbstudent</property>

        <!-- JDBC connection pool settings ... using built-in test pool -->
        <property name="connection.pool_size">1</property>

        <!-- Select our SQL dialect -->
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <!-- Echo the SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Set the current session context -->
        <property name="current_session_context_class">thread</property>
 
    </session-factory>

</hibernate-configuration>

控制台错误：

代码语言：javascript
复制
    Feb 25, 2021 7:57:30 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.2.17.Final}
Feb 25, 2021 7:57:30 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/C:/eclipseWKSP/hibernate-tutorial/lib/jaxb-impl-2.2.6.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int)
WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Feb 25, 2021 7:57:31 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
Feb 25, 2021 7:57:31 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
Feb 25, 2021 7:57:31 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [com.mysql.cj.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/hb_student_tracker?useSSL=false&serverTimezone=UTC]
Feb 25, 2021 7:57:31 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {password=****, user=hbstudent}
Feb 25, 2021 7:57:31 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
Feb 25, 2021 7:57:31 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl$PooledConnections <init>
INFO: HHH000115: Hibernate connection pool size: 1 (min=1)
Feb 25, 2021 7:57:31 PM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
Feb 25, 2021 7:57:32 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
INFO: HHH10001008: Cleaning up connection pool [jdbc:mysql://localhost:3306/hb_student_tracker?useSSL=false&serverTimezone=UTC]
Initial SessionFactory creation failed
org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister
    at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:123)
    at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:77)
    at org.hibernate.metamodel.internal.MetamodelImpl.initialize(MetamodelImpl.java:129)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:300)
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:462)
    at com.vv.hibernate.demo.CreateStudentDemo.main(CreateStudentDemo.java:27)
Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.entity.PojoEntityTuplizer]
    at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:91)
    at org.hibernate.tuple.entity.EntityTuplizerFactory.constructDefaultTuplizer(EntityTuplizerFactory.java:116)
    at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:382)
    at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:519)
    at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:124)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:64)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
    at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:96)
    ... 5 more
Caused by: java.lang.reflect.InvocationTargetException
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:64)
    at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
    at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:500)
    at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:481)
    at org.hibernate.tuple.entity.EntityTuplizerFactory.constructTuplizer(EntityTuplizerFactory.java:88)
    ... 15 more
Caused by: java.lang.NullPointerException: Cannot invoke "java.lang.reflect.AccessibleObject.setAccessible(boolean)" because "ao" is null
    at javassist.util.proxy.SecurityActions.setAccessible(SecurityActions.java:103)
    at javassist.util.proxy.DefineClassHelper.toClass3(DefineClassHelper.java:151)
    at javassist.util.proxy.DefineClassHelper.toClass2(DefineClassHelper.java:134)
    at javassist.util.proxy.DefineClassHelper.toClass(DefineClassHelper.java:95)
    at javassist.util.proxy.FactoryHelper.toClass(FactoryHelper.java:131)
    at javassist.util.proxy.ProxyFactory.createClass3(ProxyFactory.java:530)
    at javassist.util.proxy.ProxyFactory.createClass2(ProxyFactory.java:515)
    at javassist.util.proxy.ProxyFactory.createClass1(ProxyFactory.java:451)
    at javassist.util.proxy.ProxyFactory.createClass(ProxyFactory.java:422)
    at org.hibernate.proxy.pojo.javassist.JavassistProxyFactory.postInstantiate(JavassistProxyFactory.java:75)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.buildProxyFactory(PojoEntityTuplizer.java:162)
    at org.hibernate.tuple.entity.AbstractEntityTuplizer.<init>(AbstractEntityTuplizer.java:156)
    at org.hibernate.tuple.entity.PojoEntityTuplizer.<init>(PojoEntityTuplizer.java:58)
    ... 21 more

​

​

Java构建路径配置还附加了：

​

java
mysql
spring
hibernate
EN

回答 2

Stack Overflow用户

发布于 2021-02-26 14:02:42

hibernate的第一个原因-一些jars missing.

  • Second原因-在所有依赖项jars

中放置相同的hibernate版本

票数 0
EN

Stack Overflow用户

发布于 2021-02-26 15:26:35

我仍然找不到上面代码的确切答案，但是在回顾我正在学习的教程之后，幸运的是，错误已经消失了。将会重新分享起作用的东西。另外，我遵循了udemy chad的教程，所以任何面临同样问题的人都可以参考这篇文章。对jars版本要非常精确(chad在他的版本中并没有包含很多)。

Student.java与问题相同

CreateStudentDemo.java (我必须使用旧的ORM代码才能使其工作)

代码语言：javascript
复制
package com.vv.hibernate.demo;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

import com.vv.hibernate.demo.entity.Student;

public class CreateStudentDemo {

    public static void main(String[] args) {

        // create session factory
        SessionFactory factory = new Configuration().configure("hibernate.cfg.xml").addAnnotatedClass(Student.class)
                .buildSessionFactory();

        // create session
        Session session = factory.getCurrentSession();

        try {
            // create a student object
            System.out.println("Creating new student object...");
            Student tempStudent = new Student("Paul", "Doe", "paul@luv2code.com");

            // start a transaction
            session.beginTransaction();

            // save the student object
            System.out.println("Saving the student...");
            session.save(tempStudent);

            // commit transaction
            session.getTransaction().commit();

            System.out.println("Done!");
        } finally {
            factory.close();
        }
    }
}

hibernate.cf.xml也与question相同

控制台日志

代码语言：javascript
复制
Feb 26, 2021 12:52:06 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.2.0.Final}
Feb 26, 2021 12:52:06 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
Feb 26, 2021 12:52:06 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/C:/eclipseWKSP/hibernate-tut/lib/jaxb-impl-2.2.6.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int)
WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release
Feb 26, 2021 12:52:07 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
Feb 26, 2021 12:52:07 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
Feb 26, 2021 12:52:07 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [com.mysql.cj.jdbc.Driver] at URL [jdbc:mysql://localhost:3306/hb_student_tracker?useSSL=false&serverTimezone=UTC]
Feb 26, 2021 12:52:07 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {password=****, user=hbstudent}
Feb 26, 2021 12:52:07 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
Feb 26, 2021 12:52:07 PM org.hibernate.engine.jdbc.connections.internal.PooledConnections <init>
INFO: HHH000115: Hibernate connection pool size: 1 (min=1)
Feb 26, 2021 12:52:07 PM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
Creating new student object...
Saving the student...
Hibernate: insert into student (email, first_name, last_name) values (?, ?, ?)
Done!
Feb 26, 2021 12:52:09 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl stop
INFO: HHH10001008: Cleaning up connection pool [jdbc:mysql://localhost:3306/hb_student_tracker?useSSL=false&serverTimezone=UTC]

引用库：

​

​

票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/66366020

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