Uitab problems with R2019a

Good morning,

I'm trying to create a JTabGroup with delete icon but I have some problems to java handle object. From the following example:

% Prepare a tab-group consisting of two tabs
hTabGroup = uitabgroup;
tab1 = uitab(hTabGroup, 'title','Panel 1');
a = axes('parent', tab1); surf(peaks);
tab2 = uitab(hTabGroup, 'title','Panel 2');
uicontrol(tab2, 'String','Close', 'Callback','close(gcbf)');
% Get the underlying Java reference (use hidden property)
jTabGroup = getappdata(handle(hTabGroup),'JTabbedPane');

% First let's load the close icon
jarFile = fullfile(matlabroot,'/java/jar/mwt.jar');
iconsFolder = '/com/mathworks/mwt/resources/';
iconURI = ['jar:file:/' jarFile '!' iconsFolder 'closebox.gif'];
icon = javax.swing.ImageIcon(java.net.URL(iconURI));
 
% Now let's prepare the close button: icon, size and callback
jCloseButton = handle(javax.swing.JButton,'CallbackProperties');
jCloseButton.setIcon(icon);
jCloseButton.setPreferredSize(java.awt.Dimension(15,15));
jCloseButton.setMaximumSize(java.awt.Dimension(15,15));
jCloseButton.setSize(java.awt.Dimension(15,15));
set(jCloseButton, 'ActionPerformedCallback',@(h,e)delete(tab2));
 
% Now let's prepare a tab panel with our label and close button
jPanel = javax.swing.JPanel;	% default layout = FlowLayout
set(jPanel.getLayout, 'Hgap',0, 'Vgap',0);  % default gap = 5px
jLabel = javax.swing.JLabel('Tab #2');
jPanel.add(jLabel);
jPanel.add(jCloseButton);
 
% Now attach this tab panel as the tab-group's 2nd component
jTabGroup.setTabComponentAt(1,jPanel);	% Tab #1 = second tab

The handle of JTabGroup variable is empty, then it doesn't work. The same code works in R2014a version. Can anyone tell me why?

Where is the mistake?

Thank you

Egidio

[Guillaume]

I don't know much about the java side of the UI, so can't really help with your question.. Note that there's been major changes to matlab graphics in R2014b with the introduction of HG2, so it's not surprising that UI code that used to work in 2014a no longer works, particularly if it used undocumented features.

Also note that if you intend your code to work in future versions of matlab, java may not be a good idea as the graphics system is going to move to html and drop support for java components altogether at some point. See this discussion.

[egdeluca]

Thanks for your informations.

Egidio

[egdeluca]

I solved, thanks.