Custom Micronaut module/jar with auto-configurations

Question

Can't find a proper working example how to write own modules/libs with auto-configuration.
Can someone explain how to write proper modules for micronaut app?

Tried to load @Factory class and adding package-info.java with @Configuration annotation but that didn't help. Also was adding proper package to scan in main class like this Micronaut.build(args).packages("com.mypackage").start()

Sample:

package com.mypackage;

    public class FooService {
      public void bar() {

      }
    }

package com.mypackage;

import io.micronaut.context.annotation.Bean;
import io.micronaut.context.annotation.Factory;
import javax.inject.Singleton;

@Factory
public class FooFactory {

    @Bean
    @Singleton
    public FooService fooService() {
        return new FooService();
    }
}

//com.mypackage.package-info.java
@Configuration
package com.mypackage;

import io.micronaut.context.annotation.Configuration;

Answer 1

The actual problem was in Maven.
Micronaut Annotation Processor was not triggered by maven-compiler-plugin.

The solution was to configure annotation processors in maven-compile-plugin:

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.0</version>
            <configuration>
                <source>${maven-compiler-plugin.source}</source>
                <target>${maven-compiler-plugin.target}</target>
                <encoding>${maven-compiler-plugin.encoding}</encoding>
                <annotationProcessorPaths>
                    <!-- uncomment if you are using lombok -->
                    <!-- path>
                        <groupId>org.projectlombok</groupId>
                        <artifactId>lombok</artifactId>
                        <version>${lombok.version}</version>
                    </path -->
                    <path>
                        <groupId>io.micronaut</groupId>
                        <artifactId>micronaut-inject-java</artifactId>
                        <version>${micronaut.version}</version>
                    </path>
                </annotationProcessorPaths>
            </configuration>
        </plugin>