创建在类路径资源中定义名为entityManagerFactory的bean时出错。调用init方法失败；

Question

我使用flyway迁移db，定义为spring。jpa。冬眠ddl auto=validate，从空数据库开始。编译Maven项目时，出现以下错误：

创建在类路径资源[org/springframe/boot/自动配置/orm/jpa/HibernateJpaConfiguration.class]中定义的名为entityManagerFactory的bean时出错：调用init方法失败；

详细错误如下所示：

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.tool.schema.spi.SchemaManagementException: Schema-validation: missing table [hibernate_sequence]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1803) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1108) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.2.1.RELEASE.jar:5.2.1.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141) ~[spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.1.RELEASE.jar:2.2.1.RELEASE]
at com.exam.twister.Application.main(Application.java:11) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_181]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_181]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_181]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_181]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.2.1.RELEASE.jar:2.2.1.RELEASE]

Im使用Intellij IDEA和MySQL数据库

应用属性是

spring.jpa.hibernate.ddl-auto=validate
spring.datasource.url=jdbc:mysql://localhost:3306/twister?allowPublicKeyRetrieval=true&useSSL=false&useLegacyDatetimeCode=false&serverTimezone=UTC
spring.datasource.schemas=twister
spring.datasource.username=*
spring.datasource.password=*

spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQLDialect
spring.jpa.generate-ddl=false
spring.jpa.show-sql=true

spring.flyway.baseline-on-migrate=true

spring.freemarker.expose-request-attributes=true

V1_uuuinit_udb。sql是

CREATE TABLE IF NOT EXISTS message(
      id bigint not null auto_increment primary key,
      filename varchar(255),
      tag varchar(255),
      text varchar(2048) not null,
      user_id bigint
) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS user_role(
      user_id bigint not null,
      roles varchar(255)
) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS usr(
      id bigint not null auto_increment  primary key,
      activation_code varchar(255),
      active tinyint(1) not null,
      email varchar(255),
      password varchar(255) not null,
      username varchar(255) not null
) ENGINE=InnoDB;

alter table message
  add constraint message_user_fk
  foreign key(user_id) references usr (id);

alter table user_role
  add constraint user_role_user_fk
  foreign key(user_id) references usr (id);

更新

我将这些字符串添加到我的sql文件中，程序运行正常：

create table hibernate_sequence (next_val bigint) engine=InnoDB;
insert into hibernate_sequence values ( 1 );
insert into hibernate_sequence values ( 1 );

Answer 1

在你的pplication.properties：

改变这个

Springjpa。生成ddl=false

到

spring.jpa.generate-ddl=true

这将自动创建一个hibernate_序列，您不需要自己创建它。

Answer 2

看起来表hibernate_sequence（显然）丢失了，这就是失败的原因。

为什么会这样？

我自己没有使用过Hibernate/MySQL，但我发现hibernate使用mysql方言中的“序列表”策略来处理自动增量值。

看一看这个问题，然后用SO来回答

所以Hibernate本身不会生成任何东西，因为您的配置包含一行html" target="_blank">spring.jpa.generate-ddl=false

另一方面，您确实有自动递增的列，所以hibernate需要以某种方式映射它们，并为此使用hibernate_sequence表。我想说，一般来说，自己创建数据库对象的工具在概念上不能很好地与Flyway配合。

在决议方面。尝试使用参数运行它，这些参数可以让JPA/Hibernate生成所需的表和其他对象。然后检查数据库并创建DDL，以便使用SQL“手动”生成这些对象。

将这些添加到flyway并将防止hibernate的DDL生成的标志设置回false。

另一种方法是，如果您认为您的MySQL版本支持其他实现自动增量的方法，则尝试将MySQL方言配置为不使用表策略。（正如我所说，我从未专门使用过MySQL——我无法评论它是否支持此功能以及如何支持此功能）。