Hoge.java

import net.orekyuu.workbench.infra.ProjectName;
import net.orekyuu.workbench.project.domain.model.Project;
import net.orekyuu.workbench.project.usecase.ProjectUsecase;
import net.orekyuu.workbench.service.exceptions.ProjectNotFoundException;
import org.eclipse.jgit.api.errors.GitAPIException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;

@ControllerAdvice("net.orekyuu.workbench.controller.view.user.project")
public class ProjectControllerAdvice {

    @Autowired
    private ProjectUsecase usecase;

    @ModelAttribute
    public void addProjectObject(@PathVariable("projectId") String projectId, Model model) {
        Project project = usecase.findById(projectId).orElseThrow(() -> new ProjectNotFoundException(projectId));
        model.addAttribute("project", project);
    }
}

@Controller
public class ProjectDashboardController {
    @GetMapping("/project/{projectId}")
    public String show(@PathVariable String projectId, Model model) {
        Object project = model.asMap().get("project");
        if (project == null || !(project instanceof Project)) {
            throw new ProjectNotFoundException(projectId);
        }
        //...
    }
}