Hibernate4.3.11遇到的问题

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由于之前用的是hibernate3,在换成hibernate4.3.11的时候遇到了不少问题:

配置log4j日志

按照hibernate3那样导入所需jar包,可是抛出异常了:

java.lang.NoSuchFieldError:TRACE

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上网查了一下,是因为log4j的版本不匹配的原因,我使用的log4j是1.2.9,换成1.2.17就行了
http://coders-kitchen.com/2013/01/18/hibernate-and-java-lang-nosuchfielderror-trace/

所需jar包:
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创建SessionFactory出错

换版本的时候第一个想到的就是查文档,替换HibernateUtil类,官方文档提供的HibernateUtil是这样的:

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            return new Configuration().configure().buildSessionFactory(                new StandardServiceRegistryBuilder().build() ); //这里有错误        }        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;    }}

可是创建SessionFactory对象时还是抛出异常了

Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set

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一开始还以为是配置文件写错了,没有设置数据库方言,可以经过检查和上网查资料,Hibernate4的数据库方言设置方法和hibernate3一样,最后在一个帖子中找到解决方法:http://bbs.csdn.net/topics/390746425
但是官方文档提供的HibernateUtil是有错误的,需要改成这样:

import org.hibernate.SessionFactory;import org.hibernate.boot.registry.StandardServiceRegistry;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            Configuration cfg = new Configuration().configure();            StandardServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()                                .applySettings(cfg.getProperties()).build();            return cfg.buildSessionFactory(serviceRegistry);        }        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;    }    public static void close() {        HibernateUtil.sessionFactory.close();    }}

Hibernate各版本创建SessionFactory:
转:http://blog.csdn.net/for_shell/article/details/52829828
暂时就这两个问题,后续应该会有更多…

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