Spring Boot, Spring Data JPA with Multiple DataSources
Connecting multiple repositories to different data sources is possible using Spring Boot and Spring Data JPA. The referenced blog post provides a solution, but here's a more detailed approach:
Configuration:
Create separate configuration classes for each data source. Below are examples for two data sources:
CustomerDbConfig (First Data Source)
<code class="java">@Configuration @EnableJpaRepositories( entityManagerFactoryRef = "customerEntityManager", transactionManagerRef = "customerTransactionManager", basePackages = {"com.mm.repository.customer"}) public class CustomerDbConfig { // Bean definitions for data source, entity manager factory, and transaction manager for first data source }</code>
OrderDbConfig (Second Data Source)
<code class="java">@Configuration @EnableJpaRepositories( entityManagerFactoryRef = "orderEntityManager", transactionManagerRef = "orderTransactionManager", basePackages = {"com.mm.repository.order"}) public class OrderDbConfig { // Bean definitions for data source, entity manager factory, and transaction manager for second data source }</code>
Entities:
Define entities (models) for each data source, such as:
<code class="java">@Entity @Table(name = "customer") public class Customer { // ... } @Entity @Table(name = "order") public class Order { // ... }</code>
Repositories:
Create repositories for each entity, such as:
<code class="java">public interface CustomerRepository extends JpaRepository<Customer, Integer> {} public interface OrderRepository extends JpaRepository<Order, Integer> {}</code>
Application (Main Class):
In the main application class, ensure that all necessary beans are created and the Spring application context is set up.
<code class="java">@SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class, args); } }</code>
Properties:
Configure the two data sources in the application.properties file, including details such as URL, username, password, and driver class name.
<code class="properties"># Customer Data Source spring.datasource.primary.url=... spring.datasource.primary.username=... spring.datasource.primary.password=... spring.datasource.primary.driverClassName=... # Order Data Source spring.datasource.secondary.url=... spring.datasource.secondary.username=... spring.datasource.secondary.password=... spring.datasource.secondary.driverClassName=...</code>
Troubleshooting:
If you encounter exceptions related to missing or duplicate beans, ensure that:
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