Tables not getting created in multiple databases in spring boot application

Question

I am working on spring boot multi tenancy application. I have configured multi datasources as shown below :

application.properties

spring.multitenanc         


        

Answer 1

As @Alex said, you need differnt EntityManagers, TransactionManager and Datasources. Here is how I would do it

@Configuration
@EnableJpaRepositories(
    entityManagerFactoryRef = "dataSource1EntityManagerFactory",
    transactionManagerRef = "dataSource1TransactionManager",
    basePackageClasses = dataSource1Repository.class)
public class DataSource1Config extends SqlConfig{// Put all common code in base class SqlConfig. If not remove it

    @Bean
    @Primary
    public DataSource dataSource1() {
        //create dataSource using MultitenancyProperties::getDataSource1
    }

    @Primary
    @Bean(name = "dataSource1TransactionManager")
    PlatformTransactionManager dataSource1TransactionManager(EntityManagerFactory dataSource1EntityManagerFactory) {
        JpaTransactionManager txManager = new JpaTransactionManager();
        txManager.setEntityManagerFactory(dataSource1EntityManagerFactory);
        return txManager;
    }

    @Primary
    @Bean(name = "dataSource1EntityManagerFactory")
    LocalContainerEntityManagerFactoryBean dataSource1EntityManagerFactory() {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource1());
        em.setPackagesToScan(dataSource1Repository.class.getPackage().getName(), dataSource1ModelClass.class.getPackage().getName());
        em.setPersistenceUnitName("dataSource1Db");

        HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        vendorAdapter.setGenerateDdl(false);
        em.setJpaVendorAdapter(vendorAdapter);
        return em;
    }
}

You can create two other classes like this. Remember to use @Primary on only one instace of datasource, transactionmanger and entitymanager(doesn't matter which one). Another word of caution, make sure Repository classes are in different packages for all three databases.

Answer 2

You need 2 different persistence factories, not one, each should produce different EntityManagers for different datasources. Also each entity mapping should be marked to been used only with one entity manager. See full solution here:

http://www.baeldung.com/spring-data-jpa-multiple-databases

Answer 3

Try adding the following properties:

spring.jpa.generate-ddl=true