Spring Boot. Multiple DB repositories configuration example

JpaRepositoriesConfig.java

import java.util.Map;

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.autoconfigure.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;

import your.app.service.DbOneRepository;

import your.app.service.annotations.DbTwoRepository;

@Configuration
public class JpaRepositoriesConfig {

	@Autowired
	JpaProperties jpaProperties;
	
	@Autowired @Qualifier("ds_one")
	DataSource dsOne;
	
	@Autowired @Qualifier("ds_two")
	DataSource dsTwo;
	
	@Bean(name = "emf_one")
	LocalContainerEntityManagerFactoryBean entityManagerFactoryOne(
			EntityManagerFactoryBuilder factory) {
		return factory.dataSource(mainDataSource)
				.packages("your.app.domain1")
				.properties(getVendorProperties(mainDataSource)).build();
	}
	
	@Bean(name = "tx_manager_one")
	PlatformTransactionManager transactionManagerOne(EntityManagerFactoryBuilder factory) {
		return new JpaTransactionManager(entityManagerFactoryOne(factory).getObject());
	}
	
	@Bean(name = "emf_two")
	LocalContainerEntityManagerFactoryBean entityManagerFactoryTwo(
			EntityManagerFactoryBuilder factory) {
		return factory.dataSource(dataSource)
				.packages("your.app.domain2")
				.properties(getVendorProperties(dataSource)).build();
	}
	
	@Bean(name = "tx_manager_two")
	PlatformTransactionManager transactionManagerTwo(EntityManagerFactoryBuilder factory) {
		return new JpaTransactionManager(entityManagerFactoryTwo(factory).getObject());
	}
	
	private Map<String, String> getVendorProperties(DataSource dataSource) {
		return jpaProperties.getHibernateProperties(dataSource);
	}

	
	@Configuration
	@EnableJpaRepositories(entityManagerFactoryRef = "emf_one", transactionManagerRef = "tx_manager_one", includeFilters =
			@Filter(type = FilterType.ASSIGNABLE_TYPE, value = DbOneRepository.class))
	static class DbOnepaRepositoriesConfig {}
	
	@Configuration
	@EnableJpaRepositories(entityManagerFactoryRef = "emf_two", transactionManagerRef = "tx_manager_two",
			includeFilters = @Filter(DbTwoRepository.class))
	static class DbTwoJpaRepositoriesConfig {}
}