Spring data entities in different packages - jpa

Question

I am new to spring and want to use the following project structure in spring boot application.
Different package for each type of entity and its corresponding repository implementation.
A Package for repository configuration
*
**com.demo.Customer**
Customer.java
CustomerRepository.java
Application.java
**com.demo.Order**
Order.java
OrderRepository.java
**com.demo.config**
ApplicationConfig.java
CustomerConfig.java
OrderConfig.java
CustomerConfig.java
import com.demo.cstore.core.Customer;
#Configuration
#EnableJpaRepositories(basePackageClasses = Customer.class)
public class CustomerConfiguration {
}
Application.java
#SpringBootApplication
#ComponentScan(basePackages = {"com.demo.order"}) //inject repository from other packages
public class Application {
private static final Logger log = LoggerFactory.getLogger(Application.class);
public static void main(String[] args) {
SpringApplication.run(Application.class);
}
After compiling and running the application, only customer entity is created. Is that because application file just recognizes customer entity as it exists in the same package com.demo.Customer. How can Order entity be injected and and an entity is created?

Answer 1

The EnableJpaRepositories annotation accepts an array of Strings basePackages here you can add all packages where your entities are:
#EnableJpaRepositories(basePackages={"com.demo.order"
,"com.demo.customer"
,"com.demo.config"})
That must be enough. Hope this helps.

Answer 2

you don't need to use #ComponentScan.
According to documentation
The #SpringBootApplication annotation is equivalent to using
#Configuration, #EnableAutoConfiguration and #ComponentScan with their
default attributes
so you can just use #SpringBootApplication on your main class which is located in the base package of your packages hierarchy and you will be fine.
you can too refer to this link to know about how to structure your code and main class location
http://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-structuring-your-code.html
and this the API documentation for #SpringBootApplication
https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/autoconfigure/SpringBootApplication.html

Answer 3

In our application we customize LocalContainerEntityManagerFactoryBean, so had to set the packages to scan there eg.:
LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();
factory.setDataSource(dataSource);
factory.setPackagesToScan("com.example.multitenancy.test.entity");