Bummer! Think about how the Spring Framework is going to initially recognize this class as a controller.

Fix the one-line mistake in the class below to restore your application's functionality.

There is only one class: "public class TaskController" (which would seem to make it easy).

The question that immediately came to mind:

"So does the fix go inside the class or attached to the outside the class?"

I googled a lot and found most of the Spring boot code samples were using '@RestController'

However neither this nor variations of @Rest*something* seem to work.

So I stopped googling, and went back to looking at the "CategoryController.java" in the courses 'giflib' zip download and at time index 09:40 of this video:

https://teamtreehouse.com/library/spring-basics/using-the-mvc-architecture/add-a-categorycontroller

I spend a long long time sitting there just staring at the code line by line.

Finally it hit me --I saw they were using '@Controller' before the 'public class TaskController' line.

Could it be that simple (was I over thinking things..):

package com.teamtreehouse.todo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.ui.ModelMap;

import com.teamtreehouse.todo.repository.TaskRepository;
import com.teamtreehouse.todo.model.Task;

@Controller
public class TaskController {
  @Autowired
  private TaskRepository taskRepository;

  @RequestMapping("/")
  public String home() {
    return "task_index";
  }

  @RequestMapping("/tasks/{id}")
  public String task(@PathVariable int id, ModelMap modelMap) {
    modelMap.put("task",taskRepository.findById(id));
    return "task_detail";
  }
}

Unbelievable - it passed!

It wouldn't have taken me weeks to figure out if they had just said:

"Please add the missing single line @ annotation needed to fix the 404 error."

..and left out the confusing Bummer! 'clue' (hint) about class controller recognition