I am working with Spring-websocket and I have the following problem:

I am trying to put a placeholder inside a `@MessageMapping` annotation in order to get the url from properties. It works with `@RequestMapping` but not with `@MessageMapping`.

If I use this placeholder, the URL is null. Any idea or suggestion?

Example:

```
@RequestMapping(value= "${myProperty}")

@MessageMapping("${myProperty}")

```