Component Scan for custom annotation on Interface

Question

I have a component scan configuration as this:

   @Configuration
   @ComponentScan(basePackageClasses = {ITest.class},
                  includeFilters = {@C         


        

Answer 1

As I said earlier, component scan is working only for concrete classes.

In order to solve my problem I have followed these steps:

1. Implemented a custom org.springframework.context.annotation.ImportBeanDefinitionRegistrar
2. Created a custom annotation EnableJdbiRepositories which is importing my custom importer.
3. Extended ClassPathScanningCandidateComponentProvider in order to scan interfaces too. My custom importer used this class to scan interfaces too.

Answer 2

Creating a Dummy implementation seems quite hacky to me and all the steps Cemo mentioned require a lot of effort. But extending ClassPathScanningCandidateComponentProvider is the fastest way:

ClassPathScanningCandidateComponentProvider scanningProvider = new ClassPathScanningCandidateComponentProvider(false) {
    @Override
    protected boolean isCandidateComponent(AnnotatedBeanDefinition beanDefinition) {
        return true;
    }
};

Now you´re also able to scan for Interfaces with (custom) Annotations with Spring - which also works in Spring Boot fat jar environments, where the fast-classpath-scanner (which is mentioned in this so q&a) could have some limitations.

Answer 3

Instead of scanning an annotated interface, you can create a dummy implementation and annotate it accordingly:

@JdbiRepository
public class DummyTest implements ITest {
  public Integer deleteUserSession(String id) {
    // nothing here, just being dummy
  }
}

Then, scan the dummy implementation basePackageClasses = {DummyTest.class}.

It's a bit of a workaround, but very simple and good enough for test purposes (as seems to be here).