"Konstruktor für org.hibernate.persister.entity.SingleTableEntityPersister konnte nicht abgerufen werden "
Ich verwende kein Maven oder solche Tools und füge Bibliotheken manuell hinzu und referenziere sie. Ich habe alle ähnlichen Fragen durchgegangen, die zuvor gepostet wurden, und alle relevanten Bibliotheken eingeschlossen, die möglicherweise eingeschlossen werden müssen. Ich verwende Java 1.8, Hibernate 5 mit der gleichen Konformitätsstufe. Alle Getter und Setter sind ebenfalls vorhanden und verifiziert. Die Ursache kann nicht festgestellt werden. [BITTE DIESES DUPLIKAT NICHT MARKIEREN UND IN DEN KOMMENTAREN TEILEN, WENN SIE DER Meinung sind, dass ich eine mögliche Lösung verpasst habe]
Student.java
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 (die Hauptdatei)
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
<!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&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>
Konsolenfehler:
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 Build Path-Konfiguration ebenfalls angehängt:
Lösung des Problems
Ich konnte immer noch nicht die genaue Antwort auf den obigen Code finden, aber nachdem ich das Tutorial, dem ich folge, nachvollzogen habe, sind die Fehler zum Glück verschwunden. Werde die genauen Dinge, die funktioniert haben, erneut teilen. Außerdem habe ich das Tutorial von udemy chad befolgt, damit jeder, der mit demselben konfrontiert ist, darauf verweisen kann. Seien Sie sehr genau mit Jars-Versionen (Chad hat nicht viele in seine aufgenommen).
Student.java war dasselbe wie die Frage
CreateStudentDemo.java (ich musste alten ORM-Code verwenden, damit dies funktioniert)
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 war auch dasselbe wie die Frage
Konsolenprotokoll
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]
referenzierte Bibliotheken:
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