爲什麼Hibernate無法完成架構更新？

Question

我有一個JPA/Hibernate的Spring應用程序。如果我第一次運行它，我不會收到異常。第二個，我得到：

ERROR 1775 --- [ost-startStop-1] o.h.engine.jdbc.spi.SqlExceptionHelper : ERROR: column am.amcanorder does not exist 
org.hibernate.tool.hbm2ddl.SchemaUpdate : HHH000299: Could not complete schema update 

例外：

ava.lang.NullPointerException: null 
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final] 
    at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final] 
    at org.hibernate.tool.hbm2ddl.DatabaseMetadata.getTableMetadata(DatabaseMetadata.java:158) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final] 
    at org.hibernate.cfg.Configuration.generateSchemaUpdateScriptList(Configuration.java:1204) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final] 
    at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:237) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final] 
    at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:203) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final] 
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:522) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final] 
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1859) ~[hibernate-core-4.3.11.Final.jar:4.3.11.Final] 
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:857) [hibernate-entitymanager-4.3.11.Final.jar:4.3.11.Final] 
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl$4.perform(EntityManagerFactoryBuilderImpl.java:850) [hibernate-entitymanager-4.3.11.Final.jar:4.3.11.Final] 
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.withTccl(ClassLoaderServiceImpl.java:425) [hibernate-core-4.3.11.Final.jar:4.3.11.Final] 
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:849) [hibernate-entitymanager-4.3.11.Final.jar:4.3.11.Final] 
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60) [spring-orm-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:343) [spring-orm-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:319) [spring-orm-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1637) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:351) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:108) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.ConstructorResolver.resolveConstructorArguments(ConstructorResolver.java:634) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:444) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1123) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1018) [spring-beans-4.2.7.RELEASE.jar:4.2.7.RELEASE] 

我只是編輯的模型的枚舉類型之前，我開始應用之前，我遷移分貝。

的Propertie：

spring.jpa.hibernate.ddl-auto = update 

我的Postgres的版本是從泊塢窗庫中的最新一個。 jdbc驅動版本是：9.4-1206-jdbc42

怎麼了？你可以幫我嗎？

非常感謝！

Answer 1

當您更改實體和運行的第一次代碼，你需要在BD創建新的實體：

spring.jpa.hibernate.ddl-auto=create 

當你沒有改變實體運行，你需要使用：

spring.jpa.hibernate.ddl-auto=validate