我在Spring Boot 1.5.x中使用HibernateJpaSessionFactoryBean来获取会话的会话工厂bean。由于现在已弃用，我试图通过在EntityManagerFactory中展开来使用会话工厂。但是，我无法让EntityManagerFactory自动装配。没有bean定义它。
在EntityManagerFactory中连接需要做什么？ 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);
}
}
application.properties：
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paraemter放入创建者会话工厂的bean方法，但由于循环依赖而失败。
@Bean
public SessionFactory sessionFactoryProvider(EntityManagerFactory entityManagerFactory) {
return entityManagerFactory.unwrap(SessionFactory.class);
}
答案 0 :(得分：0)
我做的和你一样但没有@EnableTransactionManagement。
这是我的课程和属性。
@Configuration
public class SessionFactoryConfiguration {
@Autowired
private EntityManagerFactory entityManagerFactory;
@Bean
public SessionFactory getSessionFactory() {
return entityManagerFactory.unwrap(SessionFactory.class);
}
}
spring.datasource.driver类名= org.postgresql.Driver spring.datasource.url = JDBC：在PostgreSQL：//本地主机：5432 / postgres的 spring.datasource.username = postgres的 spring.datasource.password = postgres的
spring.jpa.properties.hibernate.show_sql =真 spring.jpa.properties.hibernate.format_sql = FALSE spring.jpa.properties.hibernate.jdbc.batch_size = 10 spring.jpa.properties.hibernate.id.new_generator_mappings =真
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Transaction，但您必须通过PlatformTransactionManager对其进行配置。 Spring自动配置将执行此操作，因此您无需声明它。
答案 1 :(得分：0)
从1.5升级到2.1.3时遇到了相同的问题，并通过在Spring初始化时将Dao类中的Session / SessionFactory替换为autowire来解决。
以下是一个示例：
@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，请使用以下编码并当心您可能需要手动处理事务。
@Repository
public class XXXDao {
@Autowired
private EntityManagerFactory entityManagerFactory;
private Session getSessionFactory() {
return entityManagerFactory.unwrap(SessionFactory.class);
}
...
}
我建议您同时检查 Spring boot hibernate no transaction is in progress处理交易问题