CODEWITHSUNDEEP
javaspringspring-bootdependency-injectionspring-config
Don Rhummy
Don Rhummy

Reputation: 25810

How provide a different bean implementation to @Autowire field based on annotation?

I have a config class that provides two implemenations of the same base bean interface. I want these to be set on the autowired fields conditionally based on an annotation on the field.

public class MyController
{
    @Autowired
    private MyBeanInterface base;

    @Autowired
    @MyAnnotation
    private MyBeanInterface special;
}

This is a pesudo-code of the config class:

@Configuration
public class ConfigClass
{
    @Bean
    @Primary
    public MyBeanInterface getNormalBeanInterface()
    {
        return new MyBeanInterfaceImpl();
    }

    @Bean
    //This doesn't work
    @ConditionalOnClass(MyAnnotation.class)
    public MyBeanInterface getSpecialBeanInterface()
    {
        return new MyBeanInterfaceForMyAnnotation();
    }
}

How can I make the annotated field be populated by the second bean?

Upvotes: 0

Views: 510

Answers (1)

gkatiforis
gkatiforis

Reputation: 1652

Use Qualifier annotation. Example:

Controller:

Add Qualifier annotation at the injected fields with bean id as parameter: 

public class MyController
{
    @Autowired
    @Qualifier("normalBean")
    private MyBeanInterface base;

    @Autowired
    @Qualifier("specialBean")
    private MyBeanInterface special;
}

ConfigClass

Specify bean id:

@Configuration
public class ConfigClass
{
    @Bean(name="normalBean")
    @Primary
    public MyBeanInterface getNormalBeanInterface()
    {
        return new MyBeanInterfaceImpl();
    }

    @Bean(name="specialBean")
    public MyBeanInterface getSpecialBeanInterface()
    {
        return new MyBeanInterfaceForMyAnnotation();
    }
}

Upvotes: 2

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