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Exception in thread "AWT-EventQueue-0" java.lang.​NullPointe​rException using CreateTable() / Java

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Hi,
Is there anyone here who is using the Yair's CreateTable() function.
I used this function to embed two java tables into my GUI. I didn't use the standard GUI uitable simply because the latter one provides me more flexibitlies.
But if I close my GUI, then I get two red java errors in workspace, in format:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at com.mathworks.widgets.spreadsheet.SpreadsheetScrollPane.cleanup(SpreadsheetScrollPane.java:571) at com.mathworks.hg.peer.UitablePeer$3.run(UitablePeer.java:149) at java.awt.event.InvocationEvent.dispatch(Unknown Source) at java.awt.EventQueue.dispatchEvent(Unknown Source) at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source) at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.pumpEvents(Unknown Source) at java.awt.EventDispatchThread.run(Unknown Source)
Does anyone have a idea why this happens and how to solve this ?
By the way, I am not a java experts. How can I find out all the methods within a java (like jTable) object?
Thanks

Answers (6)

Aleti venkatesh
Aleti venkatesh on 12 Feb 2020
Edited: Aleti venkatesh on 12 Feb 2020
I have a solution for that don't bother about that ..whenever encounter this type of error in matlab command window just you have to write this code ,which is shown in below...
opengl('save','software')
and then run the program again you have encounter same error ...
and then you just close matlab window and then open matlab freshly...
after that you run the program and code will be executed with out any errors.....
thank you.....
if you have any doubts please contact me via email....
this is my email id : venkydhoni2@gmail.com

John Libert
John Libert on 15 Mar 2012
I get this same error, and most of the time MATLAB locks up. It generally happens when MATLAB is open overnight. I have never seen it while I am working. This should be looked at by tech support as I have lost data during big overnight runs.
  3 Comments
Alistair
Alistair on 5 May 2013
I also get a similar error, which just starts repeatedly and continuously printing to the matlab command line. This happens only when I leave Matlab open and it's inactive, not processing data for a few hours -- I come back and its spewing
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
repeatedly.
Aleti venkatesh
Aleti venkatesh on 12 Feb 2020
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
I have solution for that don't bother about that ..whenever encounter this type of error in matlab command window just you have to write this code ,which is shown in below...
opengl('save','software')
and then run the program again you have encounter same error ...
and then you just close matlab window and then open matlab freshly...
after that you run the program and code will be executed with out any errors.....
thank you.....
if you have any doubts please contact me via email....
this is my email id : venkydhoni2@gmail.com

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Thulasi Durai Durai Samy
Thulasi Durai Durai Samy on 20 Jun 2012
I too have the same problem can some one support me also

Jeffery Devereux
Jeffery Devereux on 11 Jan 2018
Same problem here...

Jeffery Devereux
Jeffery Devereux on 11 Jan 2018
I am going to try adding this to my code to catch the error before it crashes my program. It only happens when I leave it running all night.
%Have some Java javaControl = javaObjectEDT('javax.swing.JFrame'); pause(0.05); drawnow; % this never hurt anyone! fprintf(' \b');

Ondrej
Ondrej on 10 Apr 2022
What worked for me was to replace the line
tab.TableScrollPane.setRowHeader('');
with
tab.TableScrollPane.setRowHeaderView(javax.swing.JLabel(''))
Then no more "AWT-EventQueue-0" exceptions when closing the uitable.

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