​Why does MATLAB Coder app give Java exception error when accessed through remote connection (Linux)?

We have a problem with MATLAB Coder app gives Java exception error when accessed through remote connection (Linux).

Currently, MATLAB R2015a is installed in 64-bit Linux server and we are trying to display on Windows 7 machine using Cygwin-X X server.

However, the following exception (please see B below) happens while trying to open (from the remote machine) 

the "MATLAB Coder" application by clicking on the App's icon in the Application TAB. 

We can start MATLAB, and simple commands such as 

    >> plot(rand(10)) 

works without any problem (Line plot Figure properly displayed). 

Is there any workaround or any guidance troubleshooting this? 

A. Environment 

Trial>> !uname -a 

Linux mendelejev.argo-graph.co.jp 3.2.0-4-amd64 #1 SMP Debian3.2.65-1+deb7u2 x86_64 GNU/Linux 

B. Exception 

-------------BEGIN 

Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError 

at 

com.mathworks.toolbox.coder.app.CoderApp$8.run(CoderApp.java:390) 

at 

com.mathworks.mwswing.MJUtilities.runOnEventDispatchThread(MJUtilities.java:911) 

at 

com.mathworks.toolbox.coder.app.CoderApp.setup(CoderApp.java:384) 

at 

com.mathworks.toolbox.coder.app.CoderApp.access$000(CoderApp.java:62) 

at 

com.mathworks.toolbox.coder.app.CoderApp$3.run(CoderApp.java:249) 

at 

com.mathworks.toolbox.coder.app.CoderApp$3.run(CoderApp.java:246) 

at 

com.mathworks.toolbox.coder.app.CoderAppModel$1$1$1.run(CoderAppModel.java:182) 

at java.awt.event.InvocationEvent.dispatch(Unknown Source) 

at java.awt.EventQueue.dispatchEventImpl(Unknown Source) 

at java.awt.EventQueue.access$200(Unknown Source) 

at java.awt.EventQueue$3.run(Unknown Source) 

at java.awt.EventQueue$3.run(Unknown Source) 

at java.security.AccessController.doPrivileged(Native Method) 

at 

java.security.ProtectionDomain$1.doIntersectionPrivilege(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) 

Caused by: java.lang.NullPointerException 

at 

com.mathworks.toolbox.coder.wfa.core.Animator.getScreenRefreshRate(Animator.java:174) 

at 

com.mathworks.toolbox.coder.wfa.core.Animator.<clinit>(Animator.java:24) 

... 21 more 

----------------END 

 

Answer 1

[MathWorks Support Team]

The NullPointerException occurs in a part of the code where we query display information from Java.

Unfortunately, this territory is not under our control.

The results of such queries depend on the JDK implementation which change with platform and environment. 

Yet, the development team is considering a guard against this specific exception.

Currently there are no workarounds.