example of java lib with isolated spring context

AnnotationBuilder.java

package com.example.customlib;

/** 
 * 
 * This class initializes annotations and beans for the Library.
 * 
 */
@ComponentScan("com.example.customlib")
@EnableAspectJAutoProxy
@EnableCaching
@EnableConfigurationProperties
public class AnnotationBuilder {

    /**
     * Bean creation for Sparta JdbcTemplate.
     * 
     * @param dataSource for the connection
     * @return new created bean
     */
    @Bean
    public JdbcTemplate jdbcTemplate(DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }
    /**
     * Configuration Properties for custom object
     * 
     */
    @Configuration
    @ConfigurationProperties(prefix = "custom.property")
    public static class CustomObject {
        private Map < String, String > item = new HashMap < > ();

        public Map < String, String > getItem() {
            return item;
        }
    }
}

CustomLibraryAPI.java

package com.example.customlib;

/**
 * 
 * Entry-point for Custom Library.
 *
 */
public class CustomLibraryAPI {

    private ApplicationContext context;
    private MyService myService;

    /**
     * Main configuration method for the API. Configures spring isolated context.
     * 
     * @param dataSource DataSource
     * @param properties Library properties
     */
    public CustomLibraryAPI(DataSource dataSource, Properties properties) {

        final Map < String, Object > extraParams = new HashMap < String, Object > ();
        extraParams.put("dataSource", dataSource);
        context = SpringContextUtils.contextMergedBeans(extraParams, AnnotationBuilder.class, properties);

        myService = context.getBean(MyService.class);
    }
    
    // make any spring bean from the isolated context available through getters.
}

CustomLibraryFactory.java

/*
*  Initiate the library inside your micronaut
*/

@Factory
class CustomLibraryFactory {

    @Bean
    @Singleton
    CustomLibraryAPI customLibraryAPI(Datasource datasource, Properties properties) {
        return new CustomLibraryAPI(datasource, properties);
    }
}

MyRepository.java

package com.example.customlib.repository;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

@Repository
public class MyRepository {
    
    @Autowired
    private JdbcTemplate jdbcTemplate;
}

MyService.java

package com.example.customlib.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class MyService {
    
    @Autowired
    private CustomObject customObject;
    
    @Autowired
    private MyRepository myRepository;
}