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 中可以作为 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 public，否则其成员不会被暴露。