Hibernate buildSessionFactory() Excepción

Question

Tengo un problema grave con la hibernación. He seguido varios libros und tutoriales en línea, pero alguna vez tengo la misma excepción "ExceptionInInitializerError" obviamente saltar de la línea HibernateUtil.java

SessionFactory sf = cfg.configure().buildSessionFactory(); 

Mi Tomcat registro dice lo siguiente:

Caused by: java.lang.ExceptionInInitializerError 
at de.marcelstuht.nerven2.server.HibernateUtil.buildSessionFactory(HibernateUtil.java:23) 
at de.marcelstuht.nerven2.server.HibernateUtil.<clinit>(HibernateUtil.java:8) 
at de.marcelstuht.nerven2.shared.model.Account.<init>(Account.java:52) 
at de.marcelstuht.nerven2.server.GreetingServiceImpl.loginServer(GreetingServiceImpl.java:39) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
at java.lang.reflect.Method.invoke(Method.java:597) 
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569) 
... 21 more 

Caused by: org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister 
at org.hibernate.persister.internal.PersisterFactoryImpl.create(PersisterFactoryImpl.java:180) 
at org.hibernate.persister.internal.PersisterFactoryImpl.createEntityPersister(PersisterFactoryImpl.java:131) 
at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:345) 
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1737) 
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1775) 
at de.marcelstuht.nerven2.server.HibernateUtil.buildSessionFactory(HibernateUtil.java:18) 
... 29 more 

Caused by: org.hibernate.InstantiationException: could not instantiate test objectde.marcelstuht.nerven2.shared.model.Account 
at org.hibernate.engine.internal.UnsavedValueFactory.instantiate(UnsavedValueFactory.java:49) 
at org.hibernate.engine.internal.UnsavedValueFactory.getUnsavedIdentifierValue(UnsavedValueFactory.java:68) 
at org.hibernate.tuple.PropertyFactory.buildIdentifierProperty(PropertyFactory.java:75) 
at org.hibernate.tuple.entity.EntityMetamodel.<init>(EntityMetamodel.java:143) 
at org.hibernate.persister.entity.AbstractEntityPersister.<init>(AbstractEntityPersister.java:498) 
at org.hibernate.persister.entity.SingleTableEntityPersister.<init>(SingleTableEntityPersister.java:142) 
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
at org.hibernate.persister.internal.PersisterFactoryImpl.create(PersisterFactoryImpl.java:158) 
... 34 more 

Caused by: java.lang.reflect.InvocationTargetException 
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
at org.hibernate.engine.internal.UnsavedValueFactory.instantiate(UnsavedValueFactory.java:46) 
... 44 more 

Caused by: java.lang.NullPointerException 
at de.marcelstuht.nerven2.shared.model.Account.<init>(Account.java:52) 
... 49 more 

Account.java

package de.marcelstuht.nerven2.shared.model; 

import java.io.Serializable; 
import java.util.List; 

import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
import javax.persistence.Table; 
import javax.validation.constraints.NotNull; 

import org.apache.commons.codec.digest.DigestUtils; 
import org.hibernate.Session; 
import org.hibernate.criterion.*; 

import de.marcelstuht.nerven2.server.HibernateUtil; 

@Entity 
@Table(name = "account") 
public class Account implements Serializable { 

private static final long serialVersionUID = 2675108132819989138L; 

@Id 
@GeneratedValue(strategy = GenerationType.AUTO) 
@Column(name = "id") 
Long id; 

@NotNull 
    @Column(name = "username", unique = true) 
String username; 

@Column(name = "password") 
String password; 

@Column(name = "email") 
String email; 

protected Session session; 


public Account() { 
    session = HibernateUtil.getSessionFactory().openSession(); 
} 

public Account(Long id) { 
    this.id = id; 
    session = HibernateUtil.getSessionFactory().openSession(); 
} 

public Account(Long id, String username, String password, String email) { 
    this.id = id; 
    this.username = username; 
    this.password = password; 
    this.email = email; 
    session = HibernateUtil.getSessionFactory().openSession(); 

} 

public void setId(Long newid) { 
    id = newid; 
} 

public Long getId() { 
    return id; 
} 

public void setUsername(String user) { 
    username = user; 
} 

public String getUsername() { 
    return username; 
} 

public void setEmail(String mail) { 
    email = mail; 
} 

public String getEmail() { 
    return email; 
} 

public void setPassword(String newPass) { 
    password = newPass; 
} 

public void setNewPassword(String newPass) { 
    password = hashPassword(newPass); 
} 

public boolean checkPassword(String pass) { 
    pass = hashPassword(pass); 
    if (password.equals(pass)) return true; 
    else return false; 
} 

private String hashPassword(String password) { 
    return DigestUtils.shaHex("wudu390909dfh"+password); 
} 

public Account get(Long id) { 
    session.beginTransaction(); 
    Account result = (Account) session.get("account", id); 
    session.getTransaction().commit(); 
    return result; 
} 

public Long saveOrUpdate(Account account) { 
    if (account == null) { 
     return null; 
    } 

    session.beginTransaction(); 

    session.saveOrUpdate(account); 
    Long id = (Long) session.getIdentifier(account); 

    session.getTransaction().commit(); 
    return id; 
} 

public void delete(Account account) { 
    if (account == null) { 
     return; 
    } 
    session.beginTransaction(); 
    session.delete(account); 
    session.getTransaction().commit(); 
} 

public List<Account> getAccountByUsername(String user) { 
    session.beginTransaction(); 

    @SuppressWarnings("unchecked") 
    List<Account> result = session 
      .createCriteria(Account.class) 
      .add(Restrictions.eq("username", user)) 
      .list(); 
    session.getTransaction().commit(); 

    return result; 
} 

} 

HibernateUtil.java

package de.marcelstuht.nerven2.server; 

import org.hibernate.SessionFactory; 
import org.hibernate.cfg.Configuration; 
import org.jboss.logging.Logger; 

public class HibernateUtil { 
private static final SessionFactory sessionFactory = buildSessionFactory(); 

protected HibernateUtil() { 

} 

private static SessionFactory buildSessionFactory() { 
    try { 
     // Create the SessionFactory from hibernate.cfg.xml 
     Configuration cfg = new Configuration(); 
     SessionFactory sf = cfg.configure().buildSessionFactory(); 
     return sf; 
    } catch (Exception ex) { 
     // Make sure you log the exception, as it might be swallowed 
     Logger.getLogger(HibernateUtil.class).error("Initial SessionFactory creation failed.", ex); 
     throw new ExceptionInInitializerError(ex); 
    } 
} 

public static SessionFactory getSessionFactory() { 
    return sessionFactory; 
} 
} 

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> 

    <!-- Database connection settings --> 
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property> 
    <property name="connection.url">jdbc:mysql://127.0.0.1:3306/ba</property> 
    <property name="connection.username">*myuser*</property> 
    <property name="connection.password">*mypassword*</property> 

    <!-- JDBC connection pool (use the built-in) --> 
    <property name="connection.pool_size">1</property> 

    <!-- SQL dialect --> 
    <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property> 

    <!-- Disable the second-level cache --> 
    <!-- <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>--> 

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

    <!-- Drop and re-create the database schema on startup -->   
    <property name="hibernate.bytecode.provider">javassist</property> 

    <!-- Names the annotated entity class --> 
    <mapping class="de.marcelstuht.nerven2.shared.model.Account"/> 

</session-factory> 

He intentado tanto Hibernate 3.6.9, así como 4.0.1 (en diferentes proyectos de Eclipse). Una captura de pantalla de los JAR he ido añadiendo al proyecto está disponible en Skitch: https://skitch.com/marcelstuht/g7h8h/properties-for-nerven2

Answer 1

aused por:. Java.lang.NullPointerException en de.marcelstuht.nerven2.shared.model.Account (Account.java:52) ... 49 más

Elimina cualquier cosa de tu constructor en Cuenta. Tienes una dependencia circular. E Hibernate utiliza el público no hay argumentos consructor por sus granos

1. cargas HibernateUtil
2. que las fuerzas de la estática para funcionar buildSessionFactory
3. Hibernate instancia cuenta a través de argumentos no
4. que a su vez llama HibernateUtil ....

Confíe en mí: public no arg constructor with NO code, except POJO setters. Nada más.

Answer 2

Me encontré con este problema una vez antes. Eventualmente descubrí que agregar un método no anotado a la entidad donde las anotaciones decoran los métodos getter, lo pone en esta situación. Si realiza las anotaciones alrededor de los campos en lugar de los métodos captadores, puede tener métodos extra sin asignar.

Answer 3

Compruebe el javassist.X.jar está en su classpath.

Answer 4

También experimenté el "No se pudo obtener el constructor para org.hibernate.persister.entity.SingleTableEntityPersister" y al agregar javassist.X.X.jar al classpath me encargué de ello.