How to associate Metadata to Document / folder using JDK API

Java docs API says to use followng method, I am trying to use the same getting 404 error. 

Anyone tried this ?

public Metadata createMetadata(String typeName, Metadata metadata)

I tried something simple and it seems to work.

public static void main(String[] args) {
        BoxAPIConnection api = new BoxAPIConnection(DEVELOPER_TOKEN);

        BoxFile file = new BoxFile(api, "removed for privacy33");
        file.createMetadata(new Metadata().add("/foo", "bar"));

        Metadata metadata = file.getMetadata();
        System.out.println("printing out meta-data: " + metadata.get("/foo"));
}

Here's my output:

printing out meta-data: bar

Process finished with exit code 0

Hi Kendomen,

  I created Metadata the same way you described, but while searching  for the key, I'm not getting any results. 

Thanks,

Veemini.