このGistにはJavaToDoList ( http://www.playframework-ja.org/documentation/2.1.5/JavaTodoList ) の内容を、データベースをPostgreSQLに変更する際に必要なコード修正について記述しました。(修正が必要な3ファイルの内容を一つにまとめています)

JavaToDoList-ChangeToPostgreSQL

// Task.javaを修正する
package models;

import java.util.*;
import play.db.ebean.*;
import play.data.validation.Constraints.*;
import javax.persistence.*;

@Entity
public class Task extends Model {
    
    @Id
    private Long id;

    @Required
    private String label;

    public Long getId()
    {
        return this.id;
    }

    public void setId(Long id)
    {
        this.id = id;
    }

    public String getLabel()
    {
        return this.label;
    }

    public void setLabel(String label)
    {
        this.label = label;
    }

    public static Finder<Long,Task> find = new Finder(
      Long.class, Task.class
    );

    public static List<Task> all() {
        return find.all();
    }

    public static void create (Task task) {
        task.save();
    }

    public static void delete (Long id) {
        find.ref(id).delete();
    }
}

// Application.javaを修正する
package controllers;

import play.*;
import play.mvc.*;
import play.data.*;
import views.html.*;
import models.*;

public class Application extends Controller {

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

    public static Result index() {
        return redirect(routes.Application.tasks());
        // return ok(index.render("Your new application is ready."));
    }

    public static Result tasks() {
        return ok(
          views.html.index.render(Task.all(), taskForm)
        );
    }

    public static Result newTask() {
        Form<Task> filledForm = taskForm.bindFromRequest();
        if(filledForm.hasErrors()) {
            return badRequest (
              views.html.index.render(Task.all(), filledForm)
            );
        } else {
            Task.create(filledForm.get());
            return redirect(routes.Application.tasks());
        }
    }

    public static Result deleteTask(Long id) {
        Task.delete(id);
        return redirect(routes.Application.tasks());
    }

}

// index.scala.htmlを修正する
@(tasks: List[Task], taskForm: Form[Task])

@import helper._

@main("Todo list") {
    <h1>@tasks.size() task(s)</h1>
    <ul>
        @for(task <- tasks) {
            <li>
                @task.getLabel
                @form(routes.Application.deleteTask(task.getId)) {
                    <input type="submit" value="Delete">
                }
            </li>
        }
    </ul>
    <h2>Add a new task</h2>
    @form(routes.Application.newTask()) {
        @inputText(taskForm("label")) 
        <input type="submit" value="Create">
    }
}