UI Error 'Method clone not found in class java.lang.Class'

Question

When attempting to view an application window in the User Interface error I receive the error 'Method clone not found in class java.lang.Class'. The window will run correctly when I execute the application and other objects on the window are displayed correctly in the UI editor.
Within the window class I have used the following line of code to clone a reference list of values that is loaded just once when the application starts up: -
dsDefaultComboBoxModel priorityComboBoxModel = (dsDefaultComboBoxModel) dsReferenceLuLists.priorityComboBoxModel.clone();
And then this line of code to create a combo box: -
dsGuiComboBoxRefelu priorityComboBox = new dsGuiComboBoxRefelu(priorityComboBoxModel,ReportWindowSql.priorityCodeBuffer);
And then later on the combo box is displayed.
detailsArea.add(priorityComboBox, new XYConstraints(250,10,dsGlobalVariables.gvFieldWidthLarge,-1));
'dsDefaultComboBoxModel' is defined as follows: -
public class dsDefaultComboBoxModel extends DefaultComboBoxModel implements Cloneable
public dsDefaultComboBoxModel()
public Object clone()
try
return super.clone();
catch ( CloneNotSupportedException e )
// Shouldn't happen.
throw new InternalError( e.toString() );
This error occurs using the latest v903, but was also present in previous versions of JDeveloper.
At the moment this means that I did to execute the window in order to see all of the GUI elements that are displayed. As on option I could use something other than the clone method, but it seems to be such a nice way of copying the static reference lists.
Thanks for any help.

Answer 1

Hi Darren,
My guess is that since DefaultComboBoxModel doesn't implement Cloneable, you can't call super.clone(). Does your code compile?
Later.
Dennis