第一个Hibernate程序――错误整理

编程环境：MyEclipse10 ，其中自带的 Hibernate 选用 Hibernate4.1

参考Java web王者归来一书中的Hibernate例子，实现用Hibernate插入数据库与查询数据库

编译运行错误归纳：

1、AnnotationConfiguration()对象的使用

由于例子使用注解配置数据库映射，所以必须用AnnotationConfiguration()对象，如果使用XML配置数据库映射，则使用Configuration()对象；

但是在Hibernate3.6以后直接用Configuration()了，所以此处我们不需要修改

直接用：private static Configuration configuration = new Configuration();

2、Hibernate4.1版本中没有buildSessionFactory()的下面用法

sessionFactory = new Configuration().configure("hibernate.cfg.xml").buildSessionFactory();

所以上条指令错误

我们可以修改为：

Configuration config = new Configuration().addResource("hibernate.cfg.xml");

ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().buildServiceRegistry();

sessionFactory = config.buildSessionFactory(serviceRegistry);

出现错误如下：

Initial SessinFactory creation failed.org.hibernate.HibernateException: Connection cannot be null when 'hibernate.dialect' not set

Exception in thread "main" java.lang.ExceptionInInitializerError

at carrie.hibernate.util.HibernateUtil.<clinit>(HibernateUtil.java:29)

at com.carrie.hiberanate.test.CatTest.main(CatTest.java:31)

Caused by: org.hibernate.HibernateException: Connection cannot be null when 'hibernate.dialect' not set

at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:97)

at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:67)

at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:174)

at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)

at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)

at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)

at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71)

at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2277)

at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2273)

at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1742)

at carrie.hibernate.util.HibernateUtil.<clinit>(HibernateUtil.java:18)

错误原因：无法连接，然而我们配置文件hibernate.cfg.xml中已经配置好了dialect

修改：

Configuration config = new Configuration();

config.configure(); //必须要有此句话，且位置在configure和serviceRegistry之间

ServiceRegistry serviceRegistry = new ServiceRegistryBuilder()

.applySettings(config.getProperties()).buildServiceRegistry();

sessionFactory = config.buildSessionFactory(serviceRegistry);

这样才能找到配置文件hibernate.cfg.xml

3、Error applying BeanValidation relational constraints

错误：

信息: Hibernate Validator bean-validator-3.0-JBoss-4.0.2

Initial SessinFactory creation failed.org.hibernate.HibernateException: Error applying BeanValidation relational constraints

Exception in thread "main" java.lang.ExceptionInInitializerError

at carrie.hibernate.util.HibernateUtil.<clinit>(HibernateUtil.java:29)

at com.carrie.hiberanate.test.CatTest.main(CatTest.java:31)

Caused by: org.hibernate.HibernateException: Error applying BeanValidation relational constraints

at org.hibernate.cfg.beanvalidation.BeanValidationIntegrator.applyRelationalConstraints(BeanValidationIntegrator.java:219)

at org.hibernate.cfg.beanvalidation.BeanValidationIntegrator.integrate(BeanValidationIntegrator.java:126)

at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:306)

at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1744)

at carrie.hibernate.util.HibernateUtil.<clinit>(HibernateUtil.java:24)

错误原因：

javax.persistence.validation.mode默认情况下是auto的，就是说如果不设置的话它是会自动去你的classpath下面找一个bean-validation**包，但是找不到，所以beanvalitionFactory错误

修改：

在hibernate.hbm.xml中加上

<property name="javax.persistence.validation.mode">none</property>

4、JDBC Driver class not found: com.mysql.jdbc.Driver

错误原因：驱动没有加载

添加mysql-connector-java-5.1.25-bin.jar到工程

找到MYSQL安装目录，Connector J 5.1.25下的mysql-connector-java-5.1.25-bin.jar，将其添加到工程