官方文档提供的HibernateUtil是这样的
package org.hibernate.tutorial.util;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate.cfg.xml
//明显有语法错误，我在下面加了一句return
new Configuration().configure().buildSessionFactory(
new StandardServiceRegistryBuilder().build() );
}
catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
用这个报Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not这个错误，然后在网上找到的解决方案改成下面这样，就没问题了
package com.example.util;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
// Create the SessionFactory from hibernate.cfg.xml
Configuration cfg = new Configuration().configure();
ServiceRegistry serviceRegistry= new ServiceRegistryBuilder().applySettings(cfg.getProperties()).buildServiceRegistry();
return cfg.buildSessionFactory(serviceRegistry);
// return new Configuration().configure().buildSessionFactory(
// new StandardServiceRegistryBuilder().build() );
}
catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
到底是信官方的还是.....还有后面那个方法报了好几个deprecated的警告
初学真是越学越奇怪啊。。
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我也是刚学完hibernate 这是我用的hibernateUtil 没有报什么错
不过确实看不太懂。。会用就像
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class HibernateUtil {
private static final SessionFactory sessionFactory;
static {
try {
// Create the SessionFactory from hibernate.cfg.xml
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
}
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你用的是哪个版本呀，如果是4的话用后者，用前者会报错好像是一个bug,如果是3的话那么用前者即可
------解决思路----------------------
hibernate 3和4版本是不同的，前一个是3的，后一个是4的写法吧
------解决思路----------------------
楼主改的并没有错，buildSessionFactory需要返回一个值但官方的没给，改成你那样是对的，kang2618在静态代码块里给sessionFactory赋值也是可以的
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使用后一种写法吧，这个问题当初stackoverflow中有人提出过
------解决思路----------------------
估计你得hibernate版本比较老了