WebService (WS) POST in Play 2.0 - Scala <p>When I try to pass a Map to a post, I get this error:</p> <blockquote> <p>Cannot write an instance of scala.collection.immutable.Map[java.lang.String,java.lang.String] to HTTP response. Try to define a Writeable[scala.collection.immutable.Map[java.lang.String,java.lang.String]]</p> </blockquote> <p>Here is my post example:</p> <pre><code>WS.url("http://mysql/endpoint") .post(Map("email" -&gt; "juju@juju.com")).map { response =&gt; Logger.logger.debug("response: " + response.body) } </code></pre> <p>What is happening?</p>