[FIXED] Register a WebMvcConfigurationSupport at runtime programatically

Issue

I am trying to register a SpringMvc configuration WebMvcConfigurationSupport class at runtime with my context. Typically, if I didn't have the requirement to do have it registered at runtime I would use the @Configuration annotation on the class, but I need to register a particular instance to control some of the overrides at runtime (without using statics).

Looking at the documentation here: http://docs.spring.io/spring/docs/4.0.5.RELEASE/javadoc-api/org/springframework/context/annotation/Configuration.html it would seem like I might be able to use a ConfigurationClassPostProcessor via the context.addBeanFactoryPostProcessor() method to add my instance of the WebMvcConfigurationSupport to the context at runtime, but I can't for the life of my get it to work.

Is what I want to do actually possible, and does anyone have an example?

EDIT

So I could do something like this:

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

    public static List<HttpMessageConverter<?>> converters;

    @Override
    protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.addAll(this.converters);
    }
}


WebMvcConfig.converters = //...
AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
context.register(WebMvcConfig.class);

But I don't like the use of the statics there and it means I can't use multiple instances of the WebMvcConfigurationSupport class at once. (Ie the same code creating multiple web servers)

What I would actually like is something like this:

public class WebMvcConfig extends WebMvcConfigurationSupport {

    private List<HttpMessageConverter<?>> converters;

    public WebMvcConfig setConverters(List<HttpMessageConverter<?>> converters) {
        this.converters = converters;
        return this;
    }

    @Override
    protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.addAll(this.converters);
    }
}

AnnotationConfigWebApplicationContext context = new AnnotationConfigWebApplicationContext();
context.register((new WebMvcConfig()).setConverters(...));

The ultimate idea is that I am building a sort of "web server" builder factory that will quickly throw up a server for me where I only have to give it a few parameters and some controllers (config is taken care of by the factory)....as I find that I am using the same code in alot of projects.

Solution

I've not found the answer, but I've found a workaround that I am happy with now:

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

    @Autowired
    private WebMvcConfigDetails details;

    @Override
    protected void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.addAll(details.converters);
    }
}

The the WebMvcConfigDetails need to be added to the context by this:

context.addBeanFactoryPostProcessor(new BeanFactoryPostProcessor() {

    @Override
    public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException {
        beanFactory.registerSingleton("webMvcConfigDetails", webMvcConfigDetails);
    }});

Answered By - Cheetah