[FIXED] How to know which message converter is used by spring boot?

Issue

For some reason I decided to change to another message converter, my code is below

@Bean
public HttpMessageConverters customConverters() {
    HttpMessageConverter<?> additional = new FastJsonHttpMessageConverter();
    return new HttpMessageConverters(additional);
}

Now I'd like to know how to check whether this custom converter is in effect? I tried to access /beans but only got this

{
    bean: "customConverters",
    scope: "singleton",
    type: "org.springframework.boot.autoconfigure.web.HttpMessageConverters",
    resource: "com.foo.BarApplication",
    dependencies: [ ]
}

So does exist some manner to know which message converter is used by spring boot?

Solution

Only injected dependencies are shown in the dependencies array. If you do something like

@Bean
public FastJsonHttpMessageConverter fastJsonHttpMessageConverter() {
    return new FastJsonHttpMessageConverter();
}

@Bean
@Autowired
public HttpMessageConverters convertersToBeUsed(FastJsonHttpMessageConverter converter) {
    return new HttpMessageConverters(converter);
}

you will see the FastJsonHttpMessageConverter in the list.

If you want to see all registered converters, look for HttpMessageConvertersAutoConfiguration in the bean list. It should look similar to this:

{
   bean: "org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration",
   scope: "singleton",
   type: "org.springframework.boot.autoconfigure.web.HttpMessageConvertersAutoConfiguration$$EnhancerBySpringCGLIB$$9e15b021",
   resource: "null",
   dependencies: [
       "fastJsonHttpMessageConverter",
       "stringHttpMessageConverter"
   ]
}

Answered By - mzc
Answer Checked By - Terry (JavaFixing Volunteer)