Why do I receive a java error in the MATLAB Command Window after starting MATLAB?

I receive the following java error in the MATLAB Command Window after startup:

 java.lang.NoClassDefFoundError: ice/net/proxy/Proxy 

 at java.lang.Class.forName0(Native Method) 

 at java.lang.Class.forName(Unknown Source) 

 at 

 com.mathworks.mde.desk.StartupClassLoader.callClassForName(StartupClassLoader.java:304) 

 at 

 com.mathworks.mde.desk.StartupClassLoader.access$000(StartupClassLoader.java:27) 

 at 

 com.mathworks.mde.desk.StartupClassLoader$LoadInfo.<init>(StartupClassLoader.java:80) 

 at 

 com.mathworks.mde.desk.StartupClassLoader.addLoadInfo(StartupClassLoader.java:219) 

 at 

 com.mathworks.mde.desk.StartupClassLoader.createLoadInfos(StartupClassLoader.java:195) 

 at 

 com.mathworks.mde.desk.StartupClassLoader.access$500(StartupClassLoader.java:27) 

 at 

 com.mathworks.mde.desk.StartupClassLoader$2.run(StartupClassLoader.java:147) 

 at java.util.TimerThread.mainLoop(Unknown Source) 

 at java.util.TimerThread.run(Unknown Source)

Answer 1

[MathWorks Support Team]

The error is most likely the result of an old classpath.txt file from a previous release. Try the following to resolve the error:

1. In the MATLAB Command Window, type:

          which -all classpath.txt

2. This should return $MATLAB/toolbox/local/classpath.txt, where $MATLAB is the directory in which MATLAB was installed. If MATLAB returns something else, remove the classpath.txt file.

If which -all classpath.txt returns nothing, reinstall MATLAB.

NOTE: DO NOT remove the classpath.txt file that is located in the $MATLAB/toolbox/local directory as this is required by MATLAB. If you accidentally remove this file, reinstall MATLAB.