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docs: document null arguments in @ClientCallable methods #6239

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2 changes: 2 additions & 0 deletions articles/flow/create-ui/element-api/client-server-rpc.adoc
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Expand Up @@ -107,6 +107,8 @@ You can use it anywhere in your client-side Polymer class implementation, and yo
- enumeration type which is addressed via a string value from the client-side JavaScript; and
- `TemplateModel` property types (see <</flow/create-ui/templates/polymer/model-bean#,Using Beans with a PolymerTemplate Model>>).

A `null` argument is received as Java `null` (not [classname]`JsonNull`), or as the default value for primitive parameters.

The client-side method returns a Promise, which is resolved asynchronously with the return value from the server, or `null` if the server-side return type is `void`. You can wait for the result using [methodname]`Promise.then()`. In an `async` function, the `await` keyword can also be used to wait for the result.

This example uses [methodname]`this.$server.getGreeting()` to call a server-side method and `await` the result:
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