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java.lang.ClassCastException when using LiveLink from MATLAB
Posted Jun 13, 2013, 2:49 a.m. EDT Interfacing, LiveLink for MATLAB, Studies & Solvers Version 4.3 5 Replies
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I've been successfully using COMSOL and LiveLink for a few months now for generating and simulating electromagnetic models.
However, yesterday I ran the same MATLAB code as I always do, but with a different COMSOL mph-file and I got the following error:
=====================
Error using generateSyntheticData (line 76)
Java exception occurred:
Exception:
java.lang.ClassCastException: java.lang.Object cannot be cast to java.lang.String
(rethrown as com.comsol.util.exceptions.FlException)
(rethrown as com.comsol.util.exceptions.FlException)
(rethrown as com.comsol.util.exceptions.FlException)
Messages:
The following feature has encountered a problem
The following feature has encountered a problem
Error in multiphysics compilation
- Feature: Compile Equations: Stationary (sol1/st1)
- Error: Error in multiphysics compilation.
Stack trace:
at org.eclipse.emf.cdo.internal.common.model.CDOTypeImpl$25.copyValue(CDOTypeImpl.java:585)
...
=====================
The error occurs when the MATLAB line
model.sol('sol1').runAll;
is executed (see attached file generateSyntheticData.m). Can anybody tell me, what the problem is here?
The same code works with many other, almost identical, mph-files that even use finer meshes. So a memory problem is unlikely.
Also the generated/modified mph-file can be simulated/computed perfectly fine in COMSOL itself. Only when being simulated via MATLAB/LiveLink the error occurs. Another strange thing is that just before the above line of code the command
model.sol('sol1').clearSolution;
is successfully executed. So it's not an error in the tag-String 'sol1' either.
I would appreciate any help, because I'm really stuck due to this error. :(
Thanks a lot in advance,
Joerg
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I am having the same issue. Did you every find a solution?
Thank you,
Curtis
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I don't know if you ever found a solution to your problem, but I was able to solve mine by downgrading to 4.3a. It looks like something in update 1 for 4.3b broke my simulation. I noticed that the example scatterer_on_substrate also doesn't run (uses the same basic simulation setup that I use).
Hope this helps.
Curtis
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thanks for your feedback. No, I was not able to solve that problem. So I eventually dropped using COMSOL and implemented my own 3D-FEM methods in MATLAB for my project. LiveLink just wouldn't work anymore.
Maybe COMSOL support reads your post and has a look into the last updates in order to find out what wen wrong.
Thanks again for your valuable imput,
Joerg
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I also received the exact error and just like you, I used 4.3a and my problem is solved.
Thanks for the comment,
Hossein
Joerg,
I don't know if you ever found a solution to your problem, but I was able to solve mine by downgrading to 4.3a. It looks like something in update 1 for 4.3b broke my simulation. I noticed that the example scatterer_on_substrate also doesn't run (uses the same basic simulation setup that I use).
Hope this helps.
Curtis