Discussion Forum

Hi Peter,

I have a similar problem.
I also create some plot groups with Matlab scripts.
Sometimes this works, sometimes this does not work (although the code is always the same, very strange).
Sometimes the script stops with an "unsatisfied link" java error message, when running model.result('pg8').run
Would be nice to know the reason for this strange behavior.

Anyways, when the script manages to pass this critical point and later should create an animation from this plot group in the same way you try it in your code, the script crashes, when it wants to run:
model.result.export('anim1').run

This error message appears (whatever it means).

This does not help you, but now we are two ;-)
Maybe someone experienced the same and found a solution for that.

Have a nice weekend,
Juergen







??? Java exception occurred:
Exception:
java.lang.RuntimeException: java.io.InvalidClassException: com.comsol.util.classes.FlStringList;
local class incompatible: stream classdesc serialVersionUID = -7563983620598702692, local class
serialVersionUID = 3136439966478934778
(rethrown as com.comsol.util.exceptions.FlException)
Messages:
java.io.InvalidClassException: com.comsol.util.classes.FlStringList; local class incompatible:
stream classdesc serialVersionUID = -7563983620598702692, local class serialVersionUID =
3136439966478934778

Stack trace:
at org.eclipse.emf.ecore.impl.EFactoryImpl.createFromString(EFactoryImpl.java:621)
at com.comsol.clientserver.impl.ClientserverFactoryImpl.createThrowableFromString(Unknown Source)
at com.comsol.clientserver.impl.ClientserverFactoryImpl.createFromString(Unknown Source)
at org.eclipse.emf.ecore.util.EcoreUtil.createFromString(EcoreUtil.java:3257)
at org.eclipse.emf.cdo.internal.common.model.CDOTypeImpl$25.convertToEMF(CDOTypeImpl.java:601)
at org.eclipse.emf.internal.cdo.CDOStore.convertToEMF(CDOStore.java:396)
at org.eclipse.emf.internal.cdo.CDOStore.get(CDOStore.java:171)
at org.eclipse.emf.internal.cdo.CDOObjectImpl.dynamicGet(CDOObjectImpl.java:485)
at
org.eclipse.emf.ecore.impl.EStructuralFeatureImpl$InternalSettingDelegateSingleData.dynamicGet(EStructuralFeatureImpl.java:1959)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eGet(BasicEObjectImpl.java:1029)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eGet(BasicEObjectImpl.java:1013)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eGet(BasicEObjectImpl.java:1005)
at com.comsol.clientserver.impl.JobImpl.getException(Unknown Source)
at com.comsol.model.clientserver.ClientManagerImpl.a(Unknown Source)
at com.comsol.model.clientserver.ClientManagerImpl.runServerJob(Unknown Source)
at com.comsol.model.impl.ExportFeatureImpl$a.a(Unknown Source)
at com.comsol.model.impl.ExportFeatureImpl$a.execute(Unknown Source)
at com.comsol.model.clientserver.ClientManagerImpl$d.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.InvalidClassException: com.comsol.util.classes.FlStringList; local class incompatible:
stream classdesc serialVersionUID = -7563983620598702692, local class serialVersionUID =
3136439966478934778
at java.io.ObjectStreamClass.initNonProxy(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.defaultReadFields(Unknown Source)
at java.io.ObjectInputStream.readSerialData(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at org.eclipse.emf.ecore.impl.EFactoryImpl.createFromString(EFactoryImpl.java:617)
... 22 more

Yes, I am still stuck at this problem and I would still be very happy if I knew what goes wrong here! :)

Did you find a solution or work around in the meantime?
I would be still interested in the reason for that error/bug

I'm sorry that I have to say that I haven't. I'm not working on it anymore aswell.

Good luck!

Hi,

Did you find any solution for this problem? I´m facing the exactly same problem.

Please let me know if you solved it. If not, we should talk to support about that, right?

Thanks in advance,
Andre

I agree that this kind of problems should be solved.
However, I am not working on the problem anymore. Moreover, at this moment I don't even have access to COMSOL. My work at the company has finished.

I'm sorry.

However, you can try support for sure.


Regards,

Peter.

Hi

You are always welcome to send bug reports to Comsol support.

In this case I think the problem is caused by the following: In order to Comsol to generate any graphics output when using the LiveLink for Matlab you need to start the Comsol Server with the -graphics option.


Lars Gregersen
Comsol Denmark

I have some question with the plotgroup export under matlab livelink.
I want to export a field distribution picture and I have added -graphics option to start comsol server.

first, on a machine with integrate graphic card (dell optiplex), the script lost comsolserver at plotgroup.run();
so what's the requirement on the graphic card? why?

second, on another machine I can run the same script, this machine is dell INSPIRE ONE 2320, it is slow for family use.

what I really wanted is to write pngfile without display. So how to write the matlab script? see below. I comment the run line

model.result.create('pg1', 'PlotGroup2D');
model.result('pg1').name('field');
model.result('pg1').feature.create('surf1', 'Surface');
%model.result('pg1').run; %%%%

model.result.export.create('img1', 'Image2D');
model.result.export('img1').set('plotgroup', 'pg1');
model.result.export('img1').set('title', 'on'); %%%%
model.result.export('img1').set('pngfilename', ['11.png']);
%model.result.export('img1').run; %%%%

third, how to add the default title on the export pngfile, I have check the Java API manual. a property in "title" is
string with default empty. on comsol Desktop if the title option is unchecked, a default title is add which is special and easy to distinguish. How to restore this feature under matlab script?

Thanks.

How do you start the comsol server with the -graphics option?

Dear Sean,

you can start comsol in server mode with "comsolserver -graphics" from a command line.
Then you can start Matlab and use the following lines of code in your .m file:

% path to the mli-Folder, in my case it is:
addpath 'C:\Program Files\COMSOL\COMSOL43\mli'
import com.comsol.model.*
import com.comsol.model.util.*
mphstart

if you log in to the server remotely, sometimes the "-graphics" option might cause error messages and problems related to rendering problems. Switch to software rendering instead, when you start the comsol server in graphics mode. Try "comsolserver -3drend sw -graphics"

Hope this helps,
Juergen