How to use Spring managed Hibernate interceptors in Spring Boot?

Question

Is it possible to integrate Spring managed Hibernate interceptors (http://docs.jboss.org/hibernate/orm/4.3/manual/en-US/html/ch14.html) in Spring Boot?

I'm using Spring Data JPA and Spring Data REST and need an Hibernate interceptor to act on an update of a particular field on an entity.

With standard JPA events it's not possible to get the old values, and hence I think I need to use the Hibernate interceptor.

Answer 1

There's not a particularly easy way to add a Hibernate interceptor that is also a Spring Bean but you can easily add an interceptor if it's managed entirely by Hibernate. To do that add the following to your application.properties:

spring.jpa.properties.hibernate.ejb.interceptor=my.package.MyInterceptorClassName 

If you need the Interceptor to also be a bean you can create your own LocalContainerEntityManagerFactoryBean. The EntityManagerFactoryBuilder from Spring Boot 1.1.4 is a little too restrictive with the generic of the properties so you need cast to (Map), we'll look at fixing that for 1.2.

@Bean public LocalContainerEntityManagerFactoryBean entityManagerFactory(         EntityManagerFactoryBuilder factory, DataSource dataSource,         JpaProperties properties) {     Map<String, Object> jpaProperties = new HashMap<String, Object>();     jpaProperties.putAll(properties.getHibernateProperties(dataSource));     jpaProperties.put("hibernate.ejb.interceptor", hibernateInterceptor());     return factory.dataSource(dataSource).packages("sample.data.jpa")             .properties((Map) jpaProperties).build(); }  @Bean public EmptyInterceptor hibernateInterceptor() {     return new EmptyInterceptor() {         @Override         public boolean onLoad(Object entity, Serializable id, Object[] state,                 String[] propertyNames, Type[] types) {             System.out.println("Loaded " + id);             return false;         }     }; }