在编写SSH框架的数据库连接代码运行时报错，配置好数据库方言后，它说让我重新配置，求大神帮忙，蟹蟹

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is org.hibernate.HibernateException: 'hibernate.dialect'
must be set when no Connection available

 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1514)

 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:521)

 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)

 at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:293)

 at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)

 at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:290)

 at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:191)

 at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:618)

 at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:934)

 at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)

 at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:410)

 at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306)

 at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:112)

 at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5110)

 at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5633)

 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

 at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1015)

 at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:991)

 at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)

 at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1296)

 at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:2038)

 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)

 at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)

 at java.util.concurrent.FutureTask.run(FutureTask.java:166)

 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

 at java.lang.Thread.run(Thread.java:722)

Caused by: org.hibernate.HibernateException: 'hibernate.dialect' must be set when no Connection available

 at org.hibernate.dialect.resolver.DialectFactory.buildDialect(DialectFactory.java:106)

 at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:148)

 at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2863)

 at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2859)

 at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1870)

 at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:863)

 at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:782)

 at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:188)

 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1573)

 at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1511)

 ... 26 more