Tôi gặp vấn đề nghiêm trọng khi ngủ đông. Tôi đi theo sách khác nhau und hướng dẫn trực tuyến, nhưng tôi không bao giờ có được ngoại lệ tương tự "ExceptionInInitializerError" rõ ràng là ném bởi Line HibernateUtil.javaHibernate buildSessionFactory() Ngoại lệ
SessionFactory sf = cfg.configure().buildSessionFactory();
My Tomcat log nói như sau:
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>
tôi đã cố gắng cả Hibernate 3.6.9 cũng như 4.0.1 (trong dự án Eclipse khác nhau). Một ảnh chụp màn hình của lọ Tôi thêm vào dự án có sẵn trên Skitch: https://skitch.com/marcelstuht/g7h8h/properties-for-nerven2
Cảm ơn rất nhiều. Bây giờ nó hoạt động. –
Vấn đề của tôi không phải là một hàm tạo được tải, nhưng thực ra nó phụ thuộc vào vòng tròn. Tôi đã có một initializer tĩnh cho SesssionFactory, tuy nhiên, một trong các thực thể của tôi có một giá trị tĩnh yêu cầu một Query được thiết lập. Vì vậy, Hibernate không thể khởi tạo, bởi vì thực thể đó yêu cầu nó phải được khởi tạo ... (It's late .... Hy vọng rằng có ý nghĩa). –