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kotlinlang

call.receive&lt;List&lt;User&gt;&gt;() throws cannot cast exception when accessing elements.

The solution is to wrap the list inside an object and call like this:
call.receive&lt;Users&gt;()

But what if I need array to be the root of the JSON? What can I do?

P.S. I'm using gson.

I guess it is this issue, right? <https://github.com/ktorio/ktor/issues/365>

I was wrong, that's ktor-client issue, my is ktor-server.

This sample <https://gist.github.com/nikolajakshic/0a7ea29a53fab557e40deb14d7d201be>

Throws this exception <https://gist.github.com/nikolajakshic/0cba31c828c8b970da8d4e399396e0ad>

Yep, works fine with Jackson.
```
            post("/foo") {
                call.respond(call.receive&lt;List&lt;String&gt;&gt;().size)
            }
```

```
echo '["foo", "bar"]' | http POST 127.0.0.1:9080/foo
HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 1
Content-Type: application/json; charset=UTF-8

2
```

try to access the element from the list, thats when the exception happens

<https://github.com/ktorio/ktor/issues/377>

Worked fine to get the first element too.

Granted, I was only trying to get a `List&lt;String&gt;`

In the short term you could use a wrapper class with a `@JsonUnwrapped` List field (for Jackson)