How do I register my custom Environment Post Processor in Spring Boot 2.0?

Question

I followed the exact steps in this documentation.

I have the following entries in my META-INF/spring.factories

org.springframework.boot.env.EnvironmentPostProcessor=com.mygroup.myapp.CustomEnvironmentPostProcessor

My post processor:

public class CustomEnvironmentPostProcessor
        implements EnvironmentPostProcessor, Ordered {
..
}

I don't see anything in the logs as if it didn't get registered or not existing.

I unzipped the JAR and I can see META-INF/spring.factories. I can also see BOOT-INF/classes directly from the root.

What am I missing here?

Answer 1

There is no elegant way to solve this. You can make something like this :

@Component
public class CustomEnvironmentPostProcessor implements
        EnvironmentPostProcessor, ApplicationListener<ApplicationEvent> {

    private static final DeferredLog log = new DeferredLog();

    @Override
    public void postProcessEnvironment(
            ConfigurableEnvironment env, SpringApplication app) {
        log.error("This should be printed");
    }

    @Override
    public void onApplicationEvent(ApplicationEvent event) {
        log.replayTo(CustomEnvironmentPostProcessor.class);
    }
}

Answer 2

define spring.factories file

Environment Post Processor

org.springframework.boot.env.EnvironmentPostProcessor=\
class name with package