Hibernate4.3.9Final常见问题汇总

hibernate4下一个可用的hibernate.properties：

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/hibernate?characterEncoding=UTF-8
jdbc.username=username
jdbc.password=password

hibernate.dialect=org.hibernate.dialect.MySQLDialect
<!-- Enable Hibernate's automatic session context management -->
#hibernate.current_session_context_class=thread
hibernate.current_session_context_class=org.springframework.orm.hibernate4.SpringSessionContext
 <!-- start cache query -->
hibernate.cache.use_query_cache=true
hibernate.jdbc.batch_size=50
<!-- set second level -->
hibernate.cache.use_second_level_cache=true
#hibernate.cache.region.factory_class=org.hibernate.cache.ehcache.EhCacheRegionFactory
#hibernate.cache.provider_class=org.hibernate.cache.ehcache.EhCacheRegionFactory // hibernate3
hibernate.cache.provider_class=org.hibernate.cache.spi.RegionFactory
hibernate.cache.region.factory_class=org.hibernate.cache.ehcache.EhCacheRegionFactory

<!-- Drop and re-create the database schema on startup -->
hibernate.hbm2ddl.auto=update
<!-- Echo all executed SQL to stdout -->
hibernate.show_sql=true

pom.xml中相关配置：

    <properties>
        <hibernate-version>4.3.9.Final</hibernate-version>
        <spring-version>4.1.6.RELEASE</spring-version>
        <mysql-driver-version>5.1.35</mysql-driver-version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

hibernate.properpties中关于二级缓存的配置：
hibernate.cache.use_second_level_cache=true
hibernate.cache.provider_class=org.hibernate.cache.spi.RegionFactory
hibernate.cache.region.factory_class=org.hibernate.cache.ehcache.EhCacheRegionFactory
报错信息：
Caused by: org.hibernate.HibernateException: could not instantiate RegionFactory [org.hibernate.cache.ehcache.EhCacheRegionFactory]
 at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:101)
 at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:46)
 at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:105)
 at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:251)
 ... 80 more
Caused by: org.hibernate.boot.registry.selector.spi.StrategySelectionException: Unable to resolve name [org.hibernate.cache.ehcache.EhCacheRegionFactory] as strategy [org.hibernate.cache.spi.RegionFactory]
 at org.hibernate.boot.registry.selector.internal.StrategySelectorImpl.selectStrategyImplementor(StrategySelectorImpl.java:128)
 at org.hibernate.cache.internal.RegionFactoryInitiator.initiateService(RegionFactoryInitiator.java:87)
 ... 83 more

原因及解决办法：
缺少jar:hibernate-ehcache
添加：

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-ehcache</artifactId>
            <version>${hibernate-version}</version>
        </dependency>

org.hibernate.HibernateException: save is not valid without active transaction
 at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:352)
 at com.sun.proxy.$Proxy24.save(Unknown Source)
 at com.xx.dao.BaseDao.save(BaseDao.java:31)

对于提示*** is not valid without active transaction 的错误
可以在Hibernate的配置文件中做如下修改
<prop key="hibernate.current_session_context_class">org.springframework.orm.hibernate4.SpringSessionContext</prop>（Hibernate4）
对于Hibernate3.x，可以直接把上述设置删除，就不会报错了，具体原因尚不清楚。
须知：几乎所有正常的操作都必须在transcation.isActive()条件下才能执行。get,load,save, saveOrUpdate,list都属于这类。
http://blog.csdn.net/wzk527/article/details/8543480

日志打印：

增加slf4j的jar，譬如log4j可选择添加slf4j-api.jar和slf4j-log4j12.jar