Matlab compiled jar cannot run with task scheduler but can run manually

Hello everyone,

I have some matlab-code, which included as jar-File (created with matlab compiler sdk) in a java-application. If I start my java-application manually using a bat-file everything works. But if I start the same bat-file using the windows task scheduler the matlab-code cannot be executed. (The other parts of the java-application work in both cases)

Stacktrace:

... Matlab M-code Stack Trace ...
com.mathworks.toolbox.javabuilder.MWException: An error occurred while initializing the component.
Could not access the MATLAB Runtime component cache. Details: Some error has occurred in the file: b:\matlab\standalone\mclmcr\mcr_cache\mclcomponentcache.cpp, at line: 250.
The error message is: 
Failed to completely extract component!
  at com.mathworks.toolbox.javabuilder.internal.MWMCR.mclInitializeComponentInstance(Native Method)
  at com.mathworks.toolbox.javabuilder.internal.MWMCR.access$700(MWMCR.java:31)
  at com.mathworks.toolbox.javabuilder.internal.MWMCR$6.mclInitializeComponentInstance(MWMCR.java:888)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:498)
  at com.mathworks.toolbox.javabuilder.internal.MWMCR$5.invoke(MWMCR.java:770)
  at com.sun.proxy.$Proxy79.mclInitializeComponentInstance(Unknown Source)
  at com.mathworks.toolbox.javabuilder.internal.MWMCR.newInstance(MWMCR.java:632)

I also don't understand why it's accessing drive B. The file and the matlab runtime installation is located on drive C.

Things I already checked:

• Path variable of the matlab runtine installation
• Check the cache files (https://de.mathworks.com/matlabcentral/answers/33638-could-not-access-the-mcr-component-cache-error)
• Setting an env-variable MCR_ROOT_CACHE to a temp-folder (didn't found the link again)
• I tried to compile with -C but it fails:Packaging...Creating the bundle...Failed to create the install bundle[...]\for_testing\de.ctf (The system cannot find the file specified)

Setup:

• Matlab 2016b
• Java 8
• win server 2012 (64bit)

Would be great, if someone give me a hint. Thanks, Thomas

Answer 1

[Prannay Jain]

I am not sure what might be the issue, but there are few things you might try:

1) It may be a permission issue. Make sure that you have the right permissions to access MCR cache folder. Can you try changing MCR_CACHE_ROOT to some other folder and see if it makes any difference.

2) Is your application accessed/shared by multiple users? (Again look for the permissions for all the users even within your system.)

3) Did you correctly provide 'start-in' directory while creating the task? This discussion might be helpful: http://stackoverflow.com/questions/1020023/specifying-start-in-directory-in-schtasks-command-in-windows

[Thomas Schürle]

Thanks for your answer. Unfortunately it didn't solve the issue.

1) I tried another folder (also the variable names MCR_CACHE_ROOT and MCR_ROOT_CACHE)

1/2) I checked the permissions again. Everything is fine. And it's working by manual start, so it think they are fine

3) Yes, i did and it works (the java-application finds it additional files, which requires the right start-directory)

[Thomas Schürle]

Appendix: Finally, it works. I'm not really sure, what solved the issue. Probably it was the invalid name of the environment-variable; so thanks again! (I added some other applications on the same server and had some restarts and now it works...)