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

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SSOI SS
SSOI SS 2012 年 1 月 12 日
回答済み: Ondrej 2022 年 4 月 10 日
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

回答 (6 件)

Aleti venkatesh
Aleti venkatesh 2020 年 2 月 12 日
編集済み: Aleti venkatesh 2020 年 2 月 12 日
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 2012 年 3 月 15 日
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 件のコメント
Aleti venkatesh
Aleti venkatesh 2020 年 2 月 12 日
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 2012 年 6 月 20 日
I too have the same problem can some one support me also

Jeffery Devereux
Jeffery Devereux 2018 年 1 月 11 日
Same problem here...

Jeffery Devereux
Jeffery Devereux 2018 年 1 月 11 日
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 2022 年 4 月 10 日
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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