How to configure @ComponentScan to scan specific packages and get single classes from another package?

Question

How to configure component scanning to get beans from specifics packages and single classes from another? I'm trying that way, but TestClass1.class and TestClass2.class could not be found:

@ComponentScan(
    basePackages = {"com.example.package1", "com.example.package2"},
    includeFilters = @ComponentScan.Filter(type = FilterType.ASSIGNABLE_TYPE, value = {com.example.package3.TestClass1.class, com.example.package3.TestClass2.class}))

Answer 1

The attribute basePackageClasses does not work as you think. It does not scan only the configured classes, it scans the complete package of each class.

Which means that:

@ComponentScan( basePackages = {"com.example.package1", "com.example.package2"}, 
basePackageClasses = {com.example.package3.TestClass1.class, com.example.package3.TestClass2.class})

is exactly the same as:

@ComponentScan( basePackages = {"com.example.package1", "com.example.package2", "com.example.package2"} )

I would say that the simplest and cleanest way to do this is to use @Bean to define each bean:

@SpringBootApplication
@ComponentScan(basePackages = {"com.example.package1", "com.example.package2"})
public class Application {

    @Bean
    public TestClass1 testClass1() {
        // object creation
    }

    @Bean
    public TestClass2 testClass2() {
        // object creation
    }

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}