从FreeMarker模板访问Java嵌套类

Question

public class MyModel {

  private final com.google.gson.Gson gson = new Gson();
  private final SomeData someData = new SomeData();

  private class SomeData extends JsonModel() {
    String text = "text";
  }

  private class JsonModel() {
    public String toJson() {
      return gson.toJson(this);
    }
  }

  public SomeData getSomeData() {
    return someData;
  }
}

假设MyModel在FTL中可以myModel访问，为什么myModel.someData.toJson或myModel.getSomeData().toJson()会因The following has evaluated to null or missing: myModel.someData.toJson或The following has evaluated to null or missing: myModel.getSomeData().toJson()而失败？

Answer 1

JsonModel必须是公开的，否则其成员不会被曝光。