CODEWITHSUNDEEP
javaspring
brai
brai

Reputation: 55

Spring BeanPostProcessor invoked 3 times

I am doing a BeanPostProcessor implementation. My Bean PostProcessor executing 3 times. I am getting post processor invoked 2 times extra before init method. I am unable to find why it is happening. Please help me.

My code and configuration files are as

BeanPostProcesssor implementatin

public class BeanPP implements BeanPostProcessor{

    @Override
    public Object postProcessBeforeInitialization(Object o, String string) throws BeansException {
        System.out.println("---before initialization ------");
        return o;
        //throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }

    @Override
    public Object postProcessAfterInitialization(Object o, String string) throws BeansException {
        System.out.println("----After initializaion ---- ");
        return o;
        //To change body of generated methods, choose Tools | Templates.
    }        
}

Customer Bean

public class Customer {        
  private String name;

  public String getName() {
      System.out.println("..getName.....");
      return name;
  }

  public void setName(String name) {
      System.out.println("..setName.....");
      this.name = name;
  }

  @PostConstruct
  public void init(){
      System.out.println("....Bean is going though init method");
  }

  @PreDestroy
  public void destory(){
      System.out.println("....Bean is going to destroy.......");
  }
}

Configuration Class

@Configuration
public class AppConfig {
    @Bean(name="customer")
    public Customer getCustomer(){
        return new Customer();
    }
    @Bean
    public BeanPP getPP(){
        return new BeanPP();
    }

}

Main Class

public class MainApp {

    public static void main(String[] args) {
        ApplicationContext appContext = new AnnotationConfigApplicationContext(AppConfig.class);
        Customer customer = (Customer)appContext.getBean("customer");
        customer.setName("test user ");
        System.out.println(".Name is .."+customer.getName());
    }
}

Output

---before initialization ------ ----After initializaion ---- ---before initialization ------ ----After initializaion ---- ---before initialization ------ ....Bean is going though init method ----After initializaion ---- ..setName..... ..getName..... .Name is ..test user

Upvotes: 1

Views: 1319

Answers (2)

reos
reos

Reputation: 8334

Plain bean factories allow for programmatic registration of post-processors, applying to all beans created through this factory.

http://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/beans/factory/config/BeanPostProcessor.html

You have defined 3 beans, AppConfig, customer and PP. The bean post processor will be executed after every bean creation. If you have 3 beans it will be executed 3 times.

@Configuration
public class AppConfig {
    @Bean(name="customer")
    public Customer getCustomer(){
        return new Customer();
    }
    @Bean
    public BeanPP getPP(){
        return new BeanPP();
    }
}

@Configuration also define a bean, because it inheritance from @Component.

http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/context/annotation/Configuration.html

Upvotes: 3

pleft
pleft

Reputation: 7905

Can you put in postProcessBeforeInitialization to print out also the Object o class just to see which class calls the BeanPostProcessor (it may not be the Customer class, but some other object that Spring initiates, even the BeanPostProcessor itself).

@Override
public Object postProcessBeforeInitialization(Object o, String string) throws BeansException {
    System.out.println("---before initialization ------ " + o..getClass().getName());
    return o;
    //throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}

Upvotes: 0

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