Getting a SessionFactory in Spring Boot 2.0 / Hibernate 5

Question

I was using HibernateJpaSessionFactoryBean in Spring Boot 1.5.x to get a session factory bean for my sessions. Since that's deprecated now, I'm trying to use the session factory by unwrapping in an EntityManagerFactory. But, I can't get EntityManagerFactory to be autowired. There's no bean defining it.

What do I need to do to wire in an EntityManagerFactory? entityManagerFactory remains null.

/**
 * 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

Note: i tried changing the current_session_context_class to specify hibernate5 in the package, but no success.

error running bootRun: ```

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

I tried putting EntityManagerFactory as a paraemter to the bean method that creatrs teh session factory, but it failed due to circular dependency.

    @Bean
public SessionFactory sessionFactoryProvider(EntityManagerFactory entityManagerFactory) {
    return entityManagerFactory.unwrap(SessionFactory.class);
}

Did you resolve the issue ? Even I am facing circular dependency issue. — Gautam Tadigoppula, Jan 14 '20 at 02:36

score 4 · Answer 1 · edited Sep 10 '20 at 09:19

I encountered the same problem when upgrade from 1.5 to 2.1.3 and resolved by getting the Session / SessionFactory in the Dao class instead of autowire when spring init.

Following is an example:

Remove the DataBeans in you example
In the Dao classes use following to get the Session:

@Repository
@Transactional
public class XXXDao {
    @Autowired
    private EntityManager entityManager;

    private Session getSession() {
        return entityManager.unwrap(Session.class);
    }
...
}

If you really need the SessionFactory, use following coding and beware that the you might need to handle the transaction manually.

@Repository
public class XXXDao {

    @Autowired
    private EntityManagerFactory entityManagerFactory;

    private SessionFactory getSessionFactory() {
        return entityManagerFactory.unwrap(SessionFactory.class);
    }
...
}

I would suggest you check also the Spring boot hibernate no transaction is in progress for the transaction issue

score 0 · Answer 2 · edited Sep 19 '18 at 13:16

I did the same as you but without @EnableTransactionManagement.

Here my class and properties.

@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

Adding @EnableTransactionManagement means Transaction will be enabled but you have to configure it via PlatformTransactionManager. Spring autoconfiguration will do it so you don't have to declare it.

So what you have is the same as I have, except for @EnableTransactionManagement. I removed that, but entityManagerFactory is still null. — Stealth Rabbi, May 16 '18 at 09:56

Getting a SessionFactory in Spring Boot 2.0 / Hibernate 5

2 Answers2

Linked