Spring - Register bean by BeanFactoryPostProcessor

BeanFactoryPostProcessorExample.java

public class BeanFactoryPostProcessorExample {

  public static void main (String[] args) {
      AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext(MyConfig.class);
      MyBean bean = context.getBean(MyBean.class);
      bean.doSomething();
  }
}

MyBean.java

public class MyBean {
  private String strProp;

  public void setStrProp (String strProp) {
      this.strProp = strProp;
  }

  public void doSomething () {
      System.out.println("from MyBean:  " + strProp);
  }
}

MyConfig.java

@Configuration
public class MyConfig {
  @Bean
  MyConfigBean myConfigBean () {
      return new MyConfigBean();
  }
}

MyConfigBean.java

public class MyConfigBean implements BeanFactoryPostProcessor {

  @Override
  public void postProcessBeanFactory (
            ConfigurableListableBeanFactory beanFactory)
            throws BeansException {

      GenericBeanDefinition bd = new GenericBeanDefinition();
      bd.setBeanClass(MyBean.class);
      bd.getPropertyValues().add("strProp", "my string property");

      ((DefaultListableBeanFactory) beanFactory)
                .registerBeanDefinition("myBeanName", bd);
  }
}