Is there any way to get the generic type of a collection in the method support() from AbstractHttpMessageConverter in Spring?

I'm trying to create a CSV message converter to use with the Spring message converters but I'm not able to configure the support(Class<?> clazz) method when clazz is of type Collection. Basically my REST endpoint is returning a Collection of objects directly and not wrapped inside another object.

Using reflection, the only thing I'm able to get as the type of the Collection is E which obviously doesn't give me much to work with.

I've tried manually and also with helper tools like TypeUtils.genericArrayType(clazz) from Apache Commons. The only work around I can think of is to just always return true and verify the type inside the writeInternal(Object o, HttpOutputMessage message) method.

Is this a bug in the implementation of the AbstractMessageConverterMethodProcessor class that retrieves the return type of the endpoint or am I missing something?

By the way, this is the method that returns the type in the Spring implementation?

protected Class<?> getReturnValueType(Object value, MethodParameter returnType) {
    return (value != null ? value.getClass() : returnType.getParameterType());
}