java - Play Framework 文档任务列表示例错误

Question

在浏览器中:

Compilation error

error: cannot find symbol
In /home/william/fmj/app/controllers/Application.java at line 28.

24  public static Result deleteTask(Long id) {

25    return TODO;

26  }

27

28  static Form<Task> taskForm = form(Task.class); 

29

在终端中:

[error]   static Form<Task> taskForm = form(Task.class);
[error]               ^
[error]   symbol:   class Task
[error]   location: class Application
[error] /home/william/fmj/app/controllers/Application.java:16: error: cannot find symbol
[error]       views.html.index.render(Task.all(), taskForm)
[error]                               ^
[error]   symbol:   variable Task
[error]   location: class Application
[error] /home/william/fmj/app/controllers/Application.java:28: error: cannot find symbol
[error]   static Form<Task> taskForm = form(Task.class);
[error]                                     ^
[error]   symbol:   class Task
[error]   location: class Application
[error] 3 errors
[error] {file:/home/william/fmj/}fmj/compile:compile: javac returned nonzero exit code

非常感谢任何帮助。我复制并粘贴了教程 (http://www.playframework.org/documentation/2.0.2/JavaTodoList) 的代码，我不确定哪里出了问题，我真的很想学习这项技术!

Answer 1

显然你没有导入 Task模型到你的 Application Controller

您有 3 种解决方案:

1. 手动导入每个模型:

   import models.Task;
   

2. 将所有模型完全导入您的 Controller (一开始最好，但是......)

   import models.*
   

3. 最推荐:使用一些 知道何时和如何导入所需的 IDE packages和 classes并建议您应该导入(或不)(即 IntelliJ Idea - 只是建议)