Intermediary bean causing NullPointerException

Question

Hi all,
I wonder if someone could help me with an issue I'm having.
I've got a JTable bound to database fields, and when the user selects a field and clicks an "Edit" button, I'm generating an object using ConvertRowIndexToModel() method, and passing the Object to a JDialog form, using an intermediary bean object called currentPigment.
The currentPigment object is bound to various fields in the JDialog, and the bound properties are showing up correctly in the JTextField boxes. If I try to access the bean properties from the JFrame class where my JTable exists, everything is fine. However If I try to access the intermediary bean from within the JDialog, I'm getting a NullPointerException.
Here is the code from the JFrame holding the JTable linked to the database:
@Action(enabledProperty = "recordSelected")
    public void editPigment()
        PigmentEditor pe = new PigmentEditor(this, false);
        pe.setCurrentPigment(pigmentList.get(pigmentTable.convertRowIndexToModel(pigmentTable.getSelectedRow())));
        pe.setVisible(true);and here is the bean code in the JDialog class:
    protected Pigment currentPigment;
    public Pigment getCurrentPigment()
        return currentPigment;
    public void setCurrentPigment(Pigment currentPigment)
        Pigment oldCurrentPigment = this.currentPigment;
        this.currentPigment = currentPigment;
        propertyChangeSupport.firePropertyChange("currentPigment", oldCurrentPigment, currentPigment);
    }I need to access the properties of the currentPigment object so I can automatically select an item from a JTable, however if I try to access the objects getters/setters, I get a NullPointerException.
If someone could explain why this is, or how I can get round it, I'd be greatful.
Thanks in Advance.

Answer 1

Okay I figured out what the problem was / is - When the JTable is bound to the nested entity class, because no item is selected, it's removing the nested entity class creating a null value. I also tried changing to a JList and this does the same thing. However if I use a JComboBox, my item renders correctly and the nested entity class displays the correct value without being erased.
Is it possible to make a JTable select an item, before the bean binding removes the value making it null?
Many thanks,