Workaround for recent problems with running Matlab via Windows x2go

[Rob Maclachlan]

After the last Matlab upgrade I found that the Matlab desktop GUI was 
barfing out with X errors and hanging X2go at a rate that made it 
completely unusable.  Possibly this only happens with windows x2go 
because predrag was unable to reproduce it.  Anyway, via the wonders of 
Google and stackexchange I have found a partial workaround.

https://stackoverflow.com/questions/34188495/how-can-i-work-around-the-classcastexception-in-java2d-bug-id-7172749

https://www.mathworks.com/help/matlab/matlab_env/java-opts-file.html

It seems that in Java 8 a display optimizer called Java2d has now been 
enabled by default.  This is (mostly) where Matlab was having problems 
in my environment.  You can turn this off by creating a file java.opts 
with this line in it:

|-Dsun.java2d.xrender=false|

This file has to be in the directory that you start Matlab from (Matlab 
startup directory).

If other people are having this problem, we may want install this in the 
Matlab root, as described in the second link.

I am still seeing a new null pointer exception failure in event 
dispatching, but this is nonfatal.

Oct 10, 2017 1:10:48 PM sun.awt.X11.XToolkit processException
WARNING: Exception on Toolkit thread
java.lang.NullPointerException
	at sun.awt.X11.XWindowPeer.stateChanged(XWindowPeer.java:1462)
	at sun.awt.X11.XWindow.handlePropertyNotify(XWindow.java:1284)
	at sun.awt.X11.XComponentPeer.handlePropertyNotify(XComponentPeer.java:75)
	at sun.awt.X11.XBaseWindow.dispatchEvent(XBaseWindow.java:1143)
	at sun.awt.X11.XBaseWindow.dispatchToWindow(XBaseWindow.java:1086)
	at sun.awt.X11.XToolkit.dispatchEvent(XToolkit.java:502)
	at sun.awt.X11.XToolkit.run(XToolkit.java:616)
	at sun.awt.X11.XToolkit.run(XToolkit.java:532)
	at java.lang.Thread.run(Thread.java:745)

   Rob


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.srv.cs.cmu.edu/pipermail/autonlab-users/attachments/20171011/7b44cfa8/attachment.html>