john-hen
commented
2 years ago Great, you already ran the test suite. This helps because we can see that even test_standalone.py fails, which is a test script that does very little. So that narrows it down quite a bit.
It does essentially this:
import mph
client = mph.start()
model = client.create('empty')
model.save()That just creates an empty model and saves it. Running the above script (let's call it empty.py) would put a file named empty.mph in the script's folder, which we could then open in the Comsol GUI and it would contain, well, nothing, apart from a few default nodes. And that works as described when I run it. For you, it should produce the same error as before. Please confirm this before going any further.
Now, we can do the same thing in Java. You don't need to install anything, Comsol alone will do. We're just following the Comsol Programming Manual here, specifically the "Getting Started" section (page 20), although I will make it even simpler by doing the equivalent of the above Python script.
Create this empty.java file:
import com.comsol.model.*;
import com.comsol.model.util.*;
public class empty {
public static void main(String[] args) throws java.io.IOException {
ModelUtil.initStandalone(false);
Model model = ModelUtil.create("empty");
model.save("empty.mph");
System.exit(0);
}
}Then compile it using this command on the Windows command prompt:
"C:\Program Files\COMSOL\COMSOL56\Multiphysics\bin\win64\comsolcompile.exe" empty.javaAdjust the path for your Comsol installation if it's a different version or you installed it in a custom location. This should create a file named empty.class in the same directory. We can run it like so:
"C:\Program Files\COMSOL\COMSOL56\Multiphysics\java\win64\jre\bin\java.exe" -classpath ".;C:\Program Files\COMSOL\COMSOL56\Multiphysics\plugins\*" emptyThis should create the afore-mentioned empty.mph model file.
If it doesn't, then only Comsol can help you. And they should. This (using the Java API) is an officially supported use case.
If it does work in Java, but not in Python, then, well, the only clue I got while writing this is that I get pretty much exactly the same error as you do if I comment out the line ModelUtil.initStandalone(false); in the Java file. It would not explain why you get that error in Python, because that's one (among a few other things) that mph.start() already does. But we could take it from there then.
shehan807
Armin268
YohanAymonBFH
garretlanglois
Hi,
I'm creating a new issue as per #56--the following code results in the subsequent errors:
I've referenced the edge case from #49, and the following lines do not result in any errors (when I run from a Windows machine using Powershell):
I've also looked into the test suite and am able to run just about all the test_ scripts except for
test_model.py,test_node.py, andtest_standalone.py. Pasted below are the errors fromtest_model.pyandtest_standalone.py, respectively.As was mentioned earlier, this is using an FNL license, though it is unlikely to be the source of the error. There seems to be an issue with the
createUniquefunction but I am not too sure why it wouldn't work. Your assistance would be greatly appreciated.