Hibernate JPA and Spring javax.persistence.TransactionRequiredException: no transaction is in progress

Question

When I call:

entityManager.flush()

I get the exception mentioned in the title.

I am using Hibernate JPA.

Answer 1

Spring 4.3.1 / Hibernate 4.2.21

My configuration was 100% Java code with no hibernate or spring xml documents (eg context.xml, persistence.xml etc). The issue was the EntityManagerFactory I was passing to the TransactionManager, see the below configuration in the transactionManager method.

@Configuration
@EnableTransactionManagement
public class HibernateConfiguration2 {

@Bean
public DataSource dataSource() {
    return ...; // Build a basic datasource
}

@Bean
@Autowired
public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
    LocalContainerEntityManagerFactoryBean entityManagerFactory = new LocalContainerEntityManagerFactoryBean();
    entityManagerFactory.setDataSource(dataSource);
    entityManagerFactory.setPackagesToScan("nz.co.mark");
    entityManagerFactory.setPersistenceProviderClass(org.hibernate.ejb.HibernatePersistence.class);

    return entityManagerFactory;
}

@Bean
@Autowired
public EntityManager entityManager(LocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBean) {
    EntityManager em = localContainerEntityManagerFactoryBean.getNativeEntityManagerFactory().createEntityManager();
    em.setFlushMode(FlushModeType.AUTO);
    return em;
}

@Bean
@Autowired
public JpaTransactionManager transactionManager(LocalContainerEntityManagerFactoryBean emf) throws Exception {
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(emf.getObject());
    // The below line would generate javax.persistence.TransactionRequiredException: no transaction is in progress
    // transactionManager.setEntityManagerFactory(emf.getNativeEntityManagerFactory());
    return transactionManager;
}