title: Return HashMap<String, Object> from GraphQL-Java
body: <p>I tried few variant and had no luck to return a map in GraphQL. So I have the following two objects: </p>
  
  <pre><code>public class Customer {
  
      private String name, age;
      // getters &amp; setters
  }
  
  public class Person {
  
     private String type;
     private Map&lt;String, Customer&gt; customers;
     // getters &amp; setters
  }
  </code></pre>
  
  <p>My schema looks like this:</p>
  
  <pre><code>type Customer {
     name: String!
     age:  String!
  }
  
  type Person {
    type: String!
    customers: [Customer!] // Here I tried all combination but had no luck, is there a Map type support for GQL?
  }
  </code></pre>
  
  <p>Can someone please tell me how to achieve this so that GraphQL magically process this or an alternative approach. </p>
  
  <p>Many thanks!</p>