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

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

Answer 1

[Aleti venkatesh]

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 : [e-mail]

[jungsup moon]

Thank you !!!! great

Answer 2

[John Libert]

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.

[Pawel]

Same problem here unfortunately. Any updates on this matter? Is there any response from tech-supps?

many thanks

[Alistair]

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]

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 : [e-mail]

Answer 3

[Thulasi Durai Durai Samy]

I too have the same problem can some one support me also

Answer 4

[Jeffery Devereux]

Same problem here...

Answer 5

[Jeffery Devereux]

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');

Answer 6

[Ondrej]

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.