Transaction configuration with Spring 3.1 - the transaction Configuration

PersistenceJPAConfig.java

@Configuration
@EnableTransactionManagement
public class PersistenceJPAConfig{
   
   @Bean
   public LocalContainerEntityManagerFactoryBean entityManagerFactoryBean(){
      ...
   }
   
   @Bean
   public PlatformTransactionManager transactionManager(){
      JpaTransactionManager transactionManager = new JpaTransactionManager();
      transactionManager.setEntityManagerFactory( 
       entityManagerFactoryBean().getObject() );
      return transactionManager;
   }
   
}

This gist is used in:
http://www.baeldung.com/2011/12/26/transaction-configuration-with-jpa-and-spring-3-1/