74.11 Configure a component that is used by JPA

If you want to configure a component that will be used by JPA then you need to ensure that the component is initialized before JPA. Where the component is auto-configured Spring Boot will take care of this for you. For example, when Flyway is auto-configured, Hibernate is configured to depend upon Flyway so that the latter has a chance to initialize the database before Hibernate tries to use it.

If you are configuring a component yourself, you can use an EntityManagerFactoryDependsOnPostProcessor subclass as a convenient way of setting up the necessary dependencies. For example, if you are using Hibernate Search with Elasticsearch as its index manager then any EntityManagerFactory beans must be configured to depend on the elasticsearchClient bean:

**/**
 * {@link EntityManagerFactoryDependsOnPostProcessor} that ensures that
 * {@link EntityManagerFactory} beans depend on the {@code elasticsearchClient} bean.
 */**
_@Configuration_
static class ElasticsearchJpaDependencyConfiguration
        extends EntityManagerFactoryDependsOnPostProcessor {

    ElasticsearchJpaDependencyConfiguration() {
        super("elasticsearchClient");
    }

}