[英]Getting a SessionFactory in Spring Boot 2.0 / Hibernate 5
我在 Spring Boot 1.5.x 中使用HibernateJpaSessionFactoryBean
为我的会话获取会话工厂 bean。 由于现在已弃用,我尝试通过在 EntityManagerFactory 中解包来使用会话工厂。 但是,我无法自动装配 EntityManagerFactory。 没有定义它的 bean。
我需要做什么才能连接到 EntityManagerFactory? entityManagerFactory 保持为空。
/**
* A class to hold necessary data access beans.
*/
@Configuration
@EnableTransactionManagement
public class DataBeans {
@Autowired
private EntityManagerFactory entityManagerFactory;
/**
* This bean needs to be wired in so that a SessionFactory can be wired in to other data access beans.
*
* @return a session factory bean
*/
@Bean
public SessionFactory sessionFactoryProvider() {
return entityManagerFactory.unwrap(SessionFactory.class);
}
}
@SpringBootApplication
public class AppBootMain {
public static void main(String[] args) {
SpringApplication.run(AppBootMain.class, args);
}
}
应用程序属性:
spring.datasource.driverClassName=org.hsqldb.jdbc.JDBCDriver
spring.datasource.url=jdbc:hsqldb:mem:student_db
spring.datasource.username=sa
spring.datasource.password=
spring.jpa.database-platform=org.hibernate.dialect.HSQLDialect
spring.jpa.show-sql=false
spring.jpa.hibernate.ddl-auto=create-drop
# this ensures that a session factory bean is available
spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext
注意:我尝试更改current_session_context_class
以在包中指定 hibernate5,但没有成功。
运行 bootRun 时出错:```
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'dataBeans': Unsatisfied dependency expressed through field 'entityManagerFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactoryProvider' defined in class path resource [org/webapp/example/school/data/repository/DataBeans.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.hibernate.SessionFactory]: Circular reference involving containing bean 'dataBeans' - consider declaring the factory method as static for independence from its containing instance. Factory method 'sessionFactoryProvider' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:587)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:373)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1348)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:578)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:501)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$94/681094281.getObject(Unknown Source)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:327)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243)
at org.webapp.example.school.AppBootMain.main(AppBootMain.java:27)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactoryProvider' defined in class path resource [org/webapp/example/school/data/repository/DataBeans.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.hibernate.SessionFactory]: Circular reference involving containing bean 'dataBeans' - consider declaring the factory method as static for independence from its containing instance. Factory method 'sessionFactoryProvider' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:587)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1254)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1103)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:541)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:501)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)
at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$94/681094281.getObject(Unknown Source)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:251)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:584)
... 20 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.hibernate.SessionFactory]: Circular reference involving containing bean 'dataBeans' - consider declaring the factory method as static for independence from its containing instance. Factory method 'sessionFactoryProvider' threw exception; nested exception is java.lang.NullPointerException
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:579)
... 33 common frames omitted
Caused by: java.lang.NullPointerException: null
at org.webapp.example.school.data.repository.DataBeans.sessionFactoryProvider(DataBeans.java:30)
at org.webapp.example.school.data.repository.DataBeans$$EnhancerBySpringCGLIB$$ebde0844.CGLIB$sessionFactoryProvider$0(<generated>)
at org.webapp.example.school.data.repository.DataBeans$$EnhancerBySpringCGLIB$$ebde0844$$FastClassBySpringCGLIB$$f2417c25.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:361)
at org.webapp.example.school.data.repository.DataBeans$$EnhancerBySpringCGLIB$$ebde0844.sessionFactoryProvider(<generated>)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
... 34 common frames omitted
> Task :bootRun FAILED
我尝试将 EntityManagerFactory 作为创建会话工厂的 bean 方法的参数,但由于循环依赖而失败。
@Bean
public SessionFactory sessionFactoryProvider(EntityManagerFactory entityManagerFactory) {
return entityManagerFactory.unwrap(SessionFactory.class);
}
我在从 1.5 升级到 2.1.3 时遇到了同样的问题,并通过在 spring init 时获取 Dao 类中的 Session / SessionFactory 而不是 autowire 来解决。
下面是一个例子:
@Repository
@Transactional
public class XXXDao {
@Autowired
private EntityManager entityManager;
private Session getSession() {
return entityManager.unwrap(Session.class);
}
...
}
如果您确实需要 SessionFactory,请使用以下编码并注意您可能需要手动处理事务。
@Repository
public class XXXDao {
@Autowired
private EntityManagerFactory entityManagerFactory;
private SessionFactory getSessionFactory() {
return entityManagerFactory.unwrap(SessionFactory.class);
}
...
}
我建议您还检查Spring boot hibernate no transaction is in progress for the transaction issue
我和你一样,但没有@EnableTransactionManagement。
这里是我的班级和属性。
@Configuration
public class SessionFactoryConfiguration {
@Autowired
private EntityManagerFactory entityManagerFactory;
@Bean
public SessionFactory getSessionFactory() {
return entityManagerFactory.unwrap(SessionFactory.class);
}
}
spring.datasource.driver-class-name=org.postgresql.Driver spring.datasource.url=jdbc:postgresql://localhost:5432/postgres spring.datasource.username=postgres spring.datasource.password=postgres
spring.jpa.properties.hibernate.show_sql=true spring.jpa.properties.hibernate.format_sql=false spring.jpa.properties.hibernate.jdbc.batch_size=10 spring.jpa.properties.hibernate.id.new_generator_mappings=true
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.PostgreSQLDialect spring.jpa.properties.hibernate.current_session_context_class=org.springframework.orm.hibernate5.SpringSessionContext
添加@EnableTransactionManagement 意味着将启用事务,但您必须通过 PlatformTransactionManager 对其进行配置。 Spring 自动配置会这样做,因此您不必声明它。
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