title: Gson trying to parse fields annotated with @Expose(false) and crashing
body: <p>I'm trying to serialize one very basic object to JSON with Gson.</p>
  
  <p>Here is the class</p>
  
  <pre><code>@org.greenrobot.greendao.annotation.Entity
  public class Giveaway {
  
      @Id(autoincrement = true)
      @Expose(serialize = false,deserialize = false)
      private Long id;
  
      @NotNull
      private String owner;
  
      private Date raffleDate;
      private String thumbnailUrl;
  
      @ToMany(referencedJoinProperty = "giveawayId")
      private List&lt;Influencer&gt; mustFollowList;
  
  
      @NotNull
      @Convert(converter = GiveawayCommentTypeConverter.class, columnType = Integer.class)
      private GiveawayCommentType tipo;
  
  
      private String specifWordValue;
      private Integer amountFriendsToIndicate;
  
      @NotNull
      @Unique
      private String mediaId;
  
  
      //to reflect the relationships
      @ToMany(referencedJoinProperty = "raffle")
      @Expose(deserialize = false, serialize = false)
      private List&lt;UserOnGiveaway&gt; attendantsTickets;
  }
  </code></pre>
  
  <p>As you can see I've 2 fields that i DONT WANT to be serialized so I annotated them with <code>expose = false</code>, but even with this Gson is trying to serialize them and crashing due <code>OutOfMemory</code>. (UserOnGiveaway has a circular reference with Giveaway and this explains why it crashes.)</p>
  
  <p>The Gson code is:</p>
  
  <pre><code>        Gson parser = new GsonBuilder().setPrettyPrinting().excludeFieldsWithModifiers(Modifier.FINAL, Modifier.STATIC, Modifier.TRANSIENT).create();
          StringBuilder sb = new StringBuilder(200);
          try {
              for (Giveaway g : this.dao.getGiveawayDao().loadAll())
                  sb.append(parser.toJson(g) + "\n");
          } catch (Exception e) {
              e.printStackTrace();
          }
  </code></pre>
  
  <p>I didn't want to use <code>.excludeFieldsWithoutExposeAnnotation()</code> since it forces me to write way more than necessary and anotate everything just to exclude 1 field...</p>
  
  <p>What am I doing wrong?</p>