Hibernate Envers with Spring Boot - configuration

Question

I'm trying to setup Hibernate Envers to work with my Spring Boot application.

I've included the Envers dependency and added @Audited annotations and it works fine, but I'm unable to configure specific Envers properties, Spring Boot doesn't seem to pick them up.

Specifically, I've tried to set the different db schema for audit tables by putting these to application.properties, but without luck:

hibernate.envers.default_schema=app_audit 

or

org.hibernate.envers.default_schema=app_audit 

or

spring.jpa.hibernate.envers.default_schema=app_audit 

Neither of these work. Does anyone know how to set these?

EDIT.

As M. Deinum suggested I tried:

spring.jpa.properties.org.hibernate.envers.default_schema=app_audit 

and it worked!

Answer 1

For all those configuration settings that aren't by default available you can specify them by simply prefixing them with spring.jpa.properties. Those properties will be added, as is, to the EntityManagerFactory (as JPA Properties).

spring.jpa.properties.org.hibernate.envers.default_schema=app_audit  

Adding the above to the application.properties will add the properties and should configure Hibernate Envers.

This is also documented in the Spring Boot reference guide.

Links

1. Configure JPA properties
2. Envers Properties

Answer 2

Looking through the HibernateJpaAutoConfiguration class I can't see any support for envers properties. The following might not be the best solution but nevertheless your can give it a try.

In order to have Spring Boot support the envers properties you have to:

1. override the current AutoConfiguration class that Spring Boot uses to configure the Hibernate properties, so it will read the envers properties from your property files. This will read the spring.jpa.hibernate.envers.default_schema from your file and add it to the properties of the entityManagerFactoryBean:

   @Configuration public class HibernateEnversAutoConfiguration extends HibernateJpaAutoConfiguration {     private RelaxedPropertyResolver environment;     public HibernateEnversAutoConfiguration() {        this.environment = null;    }     @Override    public void setEnvironment(Environment environment) {        super.setEnvironment(environment);        this.environment = new RelaxedPropertyResolver(environment, "spring.jpa.hibernate.");    }     @Override    protected void configure(LocalContainerEntityManagerFactoryBean entityManagerFactoryBean) {        super.configure(entityManagerFactoryBean);        Map<String, Object> properties = entityManagerFactoryBean.getJpaPropertyMap();        properties.put("hibernate.envers.default_schema", this.environment.getProperty("envers.default_schema"));    } } 

2. exclude the original HibernateJpaAutoConfiguration that Spring Boot uses and add your own as a bean so it will be replaced:

   @EnableAutoConfiguration(exclude = HibernateJpaAutoConfiguration.class) @EnableJpaRepositories(basePackages = "com.gabrielruiu.test") @EntityScan(basePackages = "com.gabrielruiu.test") @ComponentScan(basePackages = "com.gabrielruiu.test") @Configuration public class Main {      public static void main(String[] args) {         SpringApplication.run(Main.class, args);   }      @Bean     public HibernateEnversAutoConfiguration hibernateEnversAutoConfiguration() {         return new HibernateEnversAutoConfiguration();     } }