title: Can't create composite primary key with foreign key in PLAY 2.0
body: <p>This is a situation I want to represent in my PLAY project:</p>
  
  <pre><code>table clients {
       client_id (pk),
       description
  }
  
  table items {
       client_id (fk, pk),
       item_id (pk)
  }
  </code></pre>
  
  <p>In the 'items' table I want to have a composite primary key that will consist of combined client_id and item_id. I have read JPA documentation as well as many posts on the topic but everything fails again and again. This is one of many versions I have tried - closest to the JPA documentation.</p>
  
  <pre><code>@Entity
  @Table(name = "items")
  public class Items extends Model {
      ItemsPK primaryKey;
  
      public Items() {
      }
  
      @EmbeddedId
      public ItemsPK getPrimaryKey() {
          return primaryKey;
      }
  
      public void setPrimaryKey(ItemsPK pk) {
          primaryKey = pk;
      }
  }
  
  @Embeddable
  public class ItemsPK implements Serializable {
      private long itemId;
      private Client client;
  
      public ItemsPK() {
      }
  
      @Column(name = "item_id")
      @GeneratedValue(strategy = GenerationType.AUTO)
      public long getItemId() {
          return itemId;
      }
  
      public void setItemId(long itemId) {
          this.itemId = itemId;
      }
  
      @ManyToOne
      @JoinColumn(name = "client_id", nullable = false)
      public Client getClient() {
          return client;
      }
  
      public void setClient(Client client) {
          this.client = client;
      }
  
      //public int hashCode() {...
      //public boolean equals(Object obj) {...
  }
  </code></pre>
  
  <p>The above code (as well as many other different setups) produce following error during play launch:</p>
  
  <blockquote>
    <p>java.lang.RuntimeException: Error reading annotations for
    models.ItemsPK
            at com.avaje.ebeaninternal.server.deploy.parse.ReadAnnotations.readAssociations(ReadAnnotations.java:73)
    ~[ebean.jar:na]
            at com.avaje.ebeaninternal.server.deploy.BeanDescriptorManager.readDeployAssociations(BeanDescriptorManager.java:1100)
    ~[ebean.jar:na]</p>
  </blockquote>
  
  <p>I don't have a clue what might be wrong with my code. I'm starting to think that it is a PLAY bug. Any ideas?</p>