problem with writing to 2 databases from Spring boot - spring-boot

Question

I was trying this code from github:https://github.com/kodinor/spring-data-many-dbs
It's an example of how to use multiple db's from a Spring-boot application. it worked fine but I added the Spring-boot-starter-web dependency and now I'm getting an error:
>Method requestMappingHandlerMapping in >org.springframework.boot.autoconfigure.web.servlet.WebMvcAutoConfiguration$En>ableWebMvcConfiguration required a single bean, but 2 were found:
> - productDSEmFactory: defined by method 'productDSEmFactory' in class >path resource [com/kodinor/configuration/ProductDBConfiguration.class]
> - userDSEmFactory: defined by method 'userDSEmFactory' in class path >resource [com/kodinor/configuration/UserDBConfiguration.class]
>
>
>Action:
>
>Consider marking one of the beans as #Primary, updating the consumer to >accept multiple beans, or using #Qualifier to identify the bean that should >be consumed<br>
I have two config files:
#Configuration
#EnableTransactionManagement
#EnableJpaRepositories(basePackageClasses = UserRepository.class, entityManagerFactoryRef = "userDSEmFactory", transactionManagerRef = "userDSTransactionManager")
public class UserDBConfiguration {
#Primary
#Bean
#ConfigurationProperties("spring.datasource1")
public DataSourceProperties userDSProperties() {
return new DataSourceProperties();
}
#Primary
#Bean
public DataSource userDS(#Qualifier("userDSProperties") DataSourceProperties userDSProperties) {
return userDSProperties.initializeDataSourceBuilder().build();
}
#Bean
public LocalContainerEntityManagerFactoryBean userDSEmFactory(#Qualifier("userDS") DataSource userDS, EntityManagerFactoryBuilder builder) {
return builder.dataSource(userDS).packages(User.class).build();
}
#Primary
#Bean
public PlatformTransactionManager userDSTransactionManager(EntityManagerFactory userDSEmFactory) {
return new JpaTransactionManager(userDSEmFactory);
}
}
#Configuration
#EnableTransactionManagement
#EnableJpaRepositories(basePackageClasses = ProductRepository.class, entityManagerFactoryRef = "productDSEmFactory", transactionManagerRef = "productDSTransactionManager")
public class ProductDBConfiguration {
#Bean
#ConfigurationProperties("spring.datasource2")
public DataSourceProperties productDSProperties() {
return new DataSourceProperties();
}
#Bean
public DataSource productDS(#Qualifier("productDSProperties") DataSourceProperties productDSProperties) {
return productDSProperties.initializeDataSourceBuilder().build();
}
#Bean
public LocalContainerEntityManagerFactoryBean productDSEmFactory(#Qualifier("productDS") DataSource productDS, EntityManagerFactoryBuilder builder) {
return builder.dataSource(productDS).packages(Product.class).build();
}
#Bean
public PlatformTransactionManager productDSTransactionManager(EntityManagerFactory productDSEmFactory) {
return new JpaTransactionManager(productDSEmFactory);
}
}
Application.properties:
spring.jpa.hibernate.ddl-auto=create
spring.jpa.generate-ddl=true
spring.datasource1.url=jdbc:mysql://localhost:3306/userdb?autoReconnect=true&useSSL=false
spring.datasource1.username=user
spring.datasource1.password=pass
spring.datasource2.url=jdbc:mysql://localhost:3306/productdb?autoReconnect=true&useSSL=false
spring.datasource2.username=user
spring.datasource2.password=pass
And a simple main app that adds some init data:
#SpringBootApplication
public class SpringDataManyDbsApplication {
public static void main(String[] args) {
SpringApplication.run(SpringDataManyDbsApplication.class, args);
}
#Autowired
private UserRepository userRepository;
#Autowired
private ProductRepository productRepository;
#PostConstruct
void init () {
User user = new User("john", "doe");
userRepository.save(user);
Product product = new Product("chair", 5);
productRepository.save(product);
}
}
I tried to add the #Primary annotation to userDSEmFactory. The error goes away but the product data isn't saved anymore. Any ideas how to save this problem? I don't have a lot of experience with Spring-boot and I've read dozens of articles but many seem to do things in a different way. Thanks so much for helping me out!
update
I've added the #Primary annotation like this:
#Primary
#Bean
public LocalContainerEntityManagerFactoryBean userDSEmFactory(#Qualifier("userDS") DataSource userDS, EntityManagerFactoryBuilder builder) {
return builder.dataSource(userDS).packages(User.class).build();
}
No there are no more errors, but only the user is being saved in the primary db and nothing is being saved to the product (second) database.
So if anybody has suggestions what could be the cause of that..

Answer 1

You are missing #Primary annotation on your userDSEmFactory
#Primary
#Bean
public LocalContainerEntityManagerFactoryBean userDSEmFactory(#Qualifier("userDS") DataSource userDS, EntityManagerFactoryBuilder builder) {
return builder.dataSource(userDS).packages(User.class).build();
}
And also it is goot to use once #EnableTransactionManagement at your main class.