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Integrate Spring JavaConfig with Legacy Configuration

The application I’m working on now uses Spring both by parsing for XML Spring configuration files in pre-determined locations and by scanning annotations-based autowiring. I’ve already stated my stance on autowiring previously, this article only concerns itself on how I could use Spring JavaConfig without migrating the whole existing codebase in a single big refactoring.

This is easily achieved by scanning the package where the JavaConfig class is located in the legacy Spring XML configuration file:

<ctx:component-scan base-package="ch.frankel.blog.spring.javaconfig.config" />

However, we may need to inject beans created through the old methods into our new JavaConfig file. In order to achieve this, we need to autowire those beans into JavaConfig:

@Configuration
public class JavaConfig {
 
    @Autowired
    private FooDao fooDao;
 
    @Autowired
    private FooService fooService;
 
    @Autowired
    private BarService barService;
 
    @Bean
    public AnotherService anotherService() {
 
        return new AnotherService(fooDao);
    }
 
    @Bean
    public MyFacade myFacade() {
 
        return new MyFacade(fooService, barService, anotherService());
    }
}

You can find complete sources for this article (including tests) in IDEA/Maven format.

Thanks to Josh Long and Gildas Cuisinier for the pointers on how to achieve this.

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