tomcat的啟動報錯：org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/sengMail]]

報錯內容如下：

org.apache.catalina.LifecycleException: Failed to start component [StandardEngine


[Catalina].StandardHost[localhost].StandardContext[/sengMail]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase.addChildInternal


(ContainerBase.java:725)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:917)
at org.apache.catalina.startup.HostConfig$DeployWar.run


(HostConfig.java:1701)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker


(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run


(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating 


bean with name 'entityManagerFactory' defined in class path resource 


[org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.clas


s]: Invocation of init method failed; nested exception is 


org.hibernate.service.spi.ServiceException: Unable to create requested service 


[org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
at 


org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initi


alizeBean(AbstractAutowireCapableBeanFactory.java:1628)
at 


org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCre


ateBean(AbstractAutowireCapableBeanFactory.java:555)
at 


org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.creat


eBean(AbstractAutowireCapableBeanFactory.java:483)
at org.springframework.beans.factory.support.AbstractBeanFactory


$1.getObject(AbstractBeanFactory.java:306)
at 


org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleto


n(DefaultSingletonBeanRegistry.java:230)
at 


org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean


(AbstractBeanFactory.java:302)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean


(AbstractBeanFactory.java:197)
at org.springframework.context.support.AbstractApplicationContext.getBean


(AbstractApplicationContext.java:1081)
at 


org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryIn


itialization(AbstractApplicationContext.java:856)
at org.springframework.context.support.AbstractApplicationContext.refresh


(AbstractApplicationContext.java:542)
at 


org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh


(EmbeddedWebApplicationContext.java:122)
at org.springframework.boot.SpringApplication.refresh


(SpringApplication.java:737)
at org.springframework.boot.SpringApplication.refreshContext


(SpringApplication.java:370)
at org.springframework.boot.SpringApplication.run


(SpringApplication.java:314)
at org.springframework.boot.web.support.SpringBootServletInitializer.run


(SpringBootServletInitializer.java:151)
at 


org.springframework.boot.web.support.SpringBootServletInitializer.createRootApplic


ationContext(SpringBootServletInitializer.java:131)
at 


org.springframework.boot.web.support.SpringBootServletInitializer.onStartup


(SpringBootServletInitializer.java:86)
at org.springframework.web.SpringServletContainerInitializer.onStartup


(SpringServletContainerInitializer.java:169)
at org.apache.catalina.core.StandardContext.startInternal


(StandardContext.java:5151)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 10 more
Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested 


service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
at 


org.hibernate.service.internal.AbstractServiceRegistryImpl.createService


(AbstractServiceRegistryImpl.java:264)
at 


org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService


(AbstractServiceRegistryImpl.java:228)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService


(AbstractServiceRegistryImpl.java:207)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure


(JdbcServicesImpl.java:51)
at 


org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService


(StandardServiceRegistryImpl.java:94)
at 


org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService


(AbstractServiceRegistryImpl.java:237)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService


(AbstractServiceRegistryImpl.java:207)
at 


org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTypes


(MetadataBuildingProcess.java:352)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete


(MetadataBuildingProcess.java:111)
at 


org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata


(EntityManagerFactoryBuilderImpl.java:847)
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build


(EntityManagerFactoryBuilderImpl.java:874)
at 


org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createCon


tainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60)
at 


org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEnt


ityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353)
at 


org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityMana


gerFactory(AbstractEntityManagerFactoryBean.java:370)
at 


org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet


(AbstractEntityManagerFactoryBean.java:359)
at 


org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invok


eInitMethods(AbstractAutowireCapableBeanFactory.java:1687)
at 


org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initi


alizeBean(AbstractAutowireCapableBeanFactory.java:1624)
... 29 more
Caused by: org.hibernate.HibernateException: Access to DialectResolutionInfo 


cannot be null when 'hibernate.dialect' not set
at 


org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect


(DialectFactoryImpl.java:100)
at 


org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect


(DialectFactoryImpl.java:54)
at 


org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService


(JdbcEnvironmentInitiator.java:137)
at 


org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService


(JdbcEnvironmentInitiator.java:35)
at 


org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService


(StandardServiceRegistryImpl.java:88)
at 


org.hibernate.service.internal.AbstractServiceRegistryImpl.createService


(AbstractServiceRegistryImpl.java:254)
... 45 more


01-Aug-2017 11:40:59.505 SEVERE [localhost-startStop-1] 


org.apache.catalina.startup.HostConfig.deployWAR Error deploying web application 


archive E:\Program Files\Apache Software Foundation\Tomcat 8.0\webapps


\sengMail.war
 java.lang.IllegalStateException: ContainerBase.addChild: start: 


org.apache.catalina.LifecycleException: Failed to start component [StandardEngine


[Catalina].StandardHost[localhost].StandardContext[/sengMail]]
at org.apache.catalina.core.ContainerBase.addChildInternal


(ContainerBase.java:728)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:917)
at org.apache.catalina.startup.HostConfig$DeployWar.run


(HostConfig.java:1701)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker


(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run


(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

然後在網上查了一下，但是大部分寫的都是資料庫驅動jar包沒裝，web.xml的配置錯誤等，但是我都一一試過都沒用，而且專案之前能用，今天只是重啟了一下tomcat而已就報錯了。經過我的不懈努力最後勉強解決了，我換了資料庫然後就可以了，應該是資料庫崩潰的緣故。但是更換資料庫始終很麻煩。