Java SE (Java Platform, Standard Edition)

I read a few tutorials online about adding images to a tableview tablecell and tried to implement what I learned from the tutorial, but I'm not having much luck. My problem is that the image is not being displayed in the table cell.

The problem is in the getTable Method of the ExampleProblem class. I know that "item" in the updateItem method of the setCellFactory is null and I can figure out why. I'm having a hard time understanding the callback part of the setCellFactory, which is making it difficult to figure out where my problem is located and why it is happening.

Hopefully, someone can help me out or at least point me in the right direction.

Thanks in advance for any help.

-Fred

package whitman.fa.encounter;


import javafx.application.Application;
import javafx.beans.property.IntegerProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.beans.property.SimpleStringProperty;
import javafx.beans.property.StringProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.TableCell;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.effect.DropShadow;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.stage.Stage;
import javafx.util.Callback;


public class ExampleProblem extends Application
{
  BorderPane rootLayout;
  ObservableList<Encounter> encounters = FXCollections.observableArrayList();
  ObservableList<MobPict> imgData = FXCollections.observableArrayList();
  Group root;
  Scene scene;
  GridPane pane;

  public ExampleProblem() 
  {
  imgData.addAll(new MobPict("Bugbear.jpg","Bugbear"), new MobPict("po_BGArcher_h.png", "PC"));
  encounters.addAll(
  new Encounter(1,5,1,1,"Bugbear",0,0,null,3,"Bestiary pg 75", imgData.get(0)), 
  new Encounter(6,15,1,1,"PC",0,0,null,3,"HeroLabs",imgData.get(1))
  );
  }



  @Override
  public void start(Stage primaryStage) throws Exception 
  {


  primaryStage.setTitle("Table Test with image column");

  //Display TableView
  Group group = getBackground();
  VBox box = new VBox();
  box.setLayoutX(20);
  box.setLayoutY(5);
  box.setSpacing(15);

  Text text = new Text("Image Column test");
  text.setFont(new Font(20));

  TableView<Encounter> table = getTable();

  box.getChildren().addAll(text, table);
  group.getChildren().add(box);

  Scene scene = new Scene(group, 680,530,Color.web("#666666"));
  primaryStage.setScene(scene);

  primaryStage.show();
  }


  public Group getBackground()
  {
  Group group = new Group();
  group.setLayoutX(40);
  group.setLayoutY(40);

  Rectangle rect = new Rectangle();
  rect.setWidth(600);
  rect.setHeight(460);
  rect.setFill(Color.web("#f5f5f5"));

  DropShadow dropShadow = new DropShadow();
  dropShadow.setRadius(50);
  dropShadow.setOffsetX(0);
  dropShadow.setOffsetY(0);
  dropShadow.setColor(Color.web("#969696"));

  rect.setEffect(dropShadow);

  group.getChildren().add(rect);

  return group;
  }


  @SuppressWarnings("unchecked")
  public TableView<Encounter> getTable()
  {
  TableView<Encounter> imageTable = new TableView<Encounter>();
  TableColumn<Encounter, Number> minChanceCol = new TableColumn<Encounter, Number>("Min Chance");
  minChanceCol.setCellValueFactory(new PropertyValueFactory<Encounter, Number>("minChance"));

  TableColumn<Encounter, Number> maxChanceCol = new TableColumn<Encounter, Number>("Max Chance");
  maxChanceCol.setCellValueFactory(new PropertyValueFactory<Encounter, Number>("maxChance"));

  TableColumn<Encounter, MobPict> imgCol = new TableColumn<Encounter, MobPict>("Images");
  imgCol.setCellValueFactory(new PropertyValueFactory<Encounter, MobPict>("mobPicPath"));

  imgCol.setCellFactory(new Callback<TableColumn<Encounter,MobPict>,TableCell<Encounter,MobPict>>()
  {


  @Override
  public TableCell<Encounter, MobPict> call(TableColumn<Encounter, MobPict> param) 
  {
  TableCell<Encounter, MobPict> cell = new TableCell<Encounter, MobPict>()
  {

  @Override
  public void updateItem(MobPict item, boolean empty)
  {
  //System.out.println("update Item called");
  //System.out.println(item.getMobName());
  if(item != null)
  {
  VBox box;
  ImageView imgView;
  box= new VBox();
  box.setAlignment(Pos.CENTER);
  imgView = new ImageView();
  imgView.setFitHeight(100);
  imgView.setFitWidth(100);
  imgView.setImage(new Image(TestApp.class.getResource("img").toString()+"/"+item.getMobPicPath()));
  box.getChildren().add(imgView);
  setGraphic(box);
  }
  }
  };
  return cell;
  };    
        });        

  imageTable.getColumns().addAll(minChanceCol,maxChanceCol, imgCol);

  imageTable.setItems(encounters);

  return imageTable;
  }


}