Web App Project, need assistance - eclipse

Question

Can someone please help, im in my first year of college and im stuck on my web development project. On my blog web page I have a list of posts which i need to arrange chronolgically (new post first). We just started arraylists in my programming class but we have not yet covered how to sort them
Were using the PLAY framework for the project consisting of models, controllers, views and routes. I have a Post Class in the models folder and a Blog Class in controllers shown below
package models;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.Lob;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import play.db.jpa.Model;
#Entity
public class Post extends Model
{
public String title;
#Lob
public String content;
#OneToMany
public List<Comment> comments = new ArrayList<Comment>();
public String comment;
public Post(String title, String content)
{
this.title = title;
this.content = content;
}
public String toString()
{
return title;
}
}
package controllers;
import java.util.List;
import models.Message;
import models.Post;
import models.User;
import play.Logger;
import play.mvc.Controller;
public class Blog extends Controller
{
public static void index()
{
User user = Accounts.getLoggedInUser();
render(user);
}
public static void newPost(String title, String content)
{
User user = Accounts.getLoggedInUser();
Post post = new Post (title, content);
post.save();
user.posts.add(post);
user.save();
Logger.info ("title:" + title + " content:" + content);
index();
}
public static void deletePost(Long postid)
{
User user = Accounts.getLoggedInUser();
Post post = Post.findById(postid);
user.posts.remove(post);
user.save();
post.delete();
index();
}
}
and this is the html code that displays the published posts
<section class="ui stacked segment">
<h4 class="ui inverted blue block header">Display Posts</h4>
#{list items:user.posts, as:'post'}
<h5 class="ui inverted green block header"></h5>
<i class="external url icon">${post.title}
#{/list}
</section>
Im totally lost in terms of the java part and have crashed the project numerous times trying to make it work, any help would be greatly appreciated