Spring data jpa配置出错

2016-04-28 12:10:21.362:WARN::Failed startup of context org.mortbay.jetty.plugin.Jetty6PluginWebAppContext@5fa15c{/,C:\Users\lutai\fdworkspace\login\src\main\webapp}
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
2016-04-28 12:10:21.367:WARN::Nested in org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [applicationContext.xml]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory:
org.hibernate.tool.schema.spi.SchemaManagementException: Schema-validation: missing sequence [hibernate_sequence]

然后validate改成了update，之后启动自带给我添加了hibernate_sequence这张表，数据库使用的是postgres，问题是我没有创建这张表，所以validate就会报错，改成update之后体会自动帮我创这张表。

<!-- 定义实体管理器工厂 Jpa配置   LocalContainerEntityManagerFactoryBean这个选项Spring扮演了容器的角色。完全掌管JPA -->
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<!-- 指定数据源 -->
<property name="dataSource" ref="BasicDataSource"/>
<property name = "jpaVendorAdapter">
<bean class = "org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
</property>
<property name="packagesToScan" value="com.lutai.login.app.entity" />
<property name="jpaProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQL94Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
</bean>

<!-- 重要配置：启用扫描并自动创建代理的功能  -->
<jpa:repositories base-package="com.lutai" entity-manager-factory-ref="entityManagerFactory" transaction-manager-ref="transactionManager"/>

<!-- Jpa 事务管理器  -->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>

<!-- 开启注解事务 -->
<tx:annotation-driven transaction-manager="transactionManager"/>