How to make a post json request to a rest api

[max]

Hello, I am programming on codename one using IntelJ IDEA CE 2017.2.6.

I am trying to make a request to a rest api - the cloud natural language api. I figured out how to make a request in the command line: 

curl -X POST https://language.googleapis.com/v1/documents:analyzeSyntax?key=[API KEY] -H "Content-Type: application/json" -d '{

"document":{ "type":"PLAIN_TEXT",

"content":"bob walks to the park"

},

"encodingType":"UTF8"

}'

But I do not know how to make the request in codename one. I read an article here https://www.codenameone.com/blog/new-rest-calls.html but I do not really understand where to put the lines of code talked about in the article. Right now my code looks like this but It is wrong

ConnectionRequest req2=new ConnectionRequest();
    req2.setUrl("https://language.googleapis.com/v1/documents:analyzeSyntax?key=[API KEY]");
    req2.setPost(false);
    req2.setHttpMethod("POST");
    String JsonData = "{document:{ type:PLAIN_TEXT, content:bob walks to the park },encodingType:UTF8}";
    req2.addArgument("Content-Type: application/json",JsonData.toString());
    NetworkManager.getInstance().addToQueueAndWait(req2);
    JSONParser parser = new JSONParser();

    Map<String,Object> result = null;
    try {
*******        result = Rest.post("https://language.googleapis.com/v1/documents:analyzeSyntax?key=[API KEY]").jsonContent().body(JsonData).getAsJsonMap();
    } catch (IOException e) {
        e.printStackTrace();
        System.out.println("fail");
    }

I implement the code that I found on this website on the starred line but I think that I put it in the wrong place because I am getting an error. Could someone please show me how to correctly make a post json request to a rest api?

Thank you

[Shai Almog]

I would suggest using the newer REST API https://www.codenameone.com/blog/rest-api-error-handling.html

E.g.:

Rest.
    post("https://language.googleapis.com/v1/documents:analyzeSyntax?apiKey").
    jsonContent().
    body("place the JSON string of the request here").

    fetchAsJsonMap(e -> {
        Map<String, Object> m = e.getResultData();
        // process response here...
    });

[maxlax...@gmail.com]

Thank you. This worked