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importing and compiling multiple custom Java classes to use with COMSOL Java API code

Posted 28.03.2023, 11:14 GMT-4 General, API, User Interface Version 6.1 2 Replies

Francisco Bernardo
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Hello,

I would like to integrate custom Java classes with my COMSOL Java API code. However, I cannot find any recommendation about how to do it using the comsol compile in the documentation.

I would like to ask for further clarification about how to do this.

Let's say I have two files, Main.java and Pair.java. The first file has the main and the COMSOL model. The second file implements a simple class Pair the works similarly to tuple.

Should I compile multiple .java files at once? Should I make a package using a directory containing classes and import them from the main file? Or should make a JAR files? How should I organise file structure and how to use comsol compile to compile?

In the comsol compile -help there is the classpathadd <classpath> option to provide an additional classpath. However, it's not clear how to use it. Could you provide examples of usage please?

Many thanks, Francisco

2 Replies Last Post 31.03.2023, 07:27 GMT-4
Nathaniel Leslie
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Posted: 2 years ago 30.03.2023, 13:25 GMT-4
Updated: 2 years ago 30.03.2023, 13:28 GMT-4

Hello Francisco,

I could be wrong, but in my experience comsol compile will allow you to compile multiple files by comsol compile file1 file2 ..., but either it or comsol batch will still throw errors if you are referencing code from file2 in file1 (unlike if you were to do something similar with javac). I have personally given-up on using more than one class when using COMSOL's java api :(

Regards,

Nathaniel

Hello Francisco, I could be wrong, but in my experience `comsol compile` will allow you to compile multiple files by `comsol compile file1 file2 ...`, but either it or `comsol batch` will still throw errors if you are referencing code from `file2` in `file1` (unlike if you were to do something similar with `javac`). I have personally given-up on using more than one class when using COMSOL's java api :( Regards, Nathaniel
Magnus Ringh COMSOL Employee

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Posted: 2 years ago 31.03.2023, 07:27 GMT-4

Hi,

You can do this, but not without specifying a JDK root such as in this example:

comsol compile -jdkroot /src/java/OpenJDK-8u265/glnxa64/jdk A.java B.java

See the COMSOL documentation for information about -jdkroot and other arguments to the comsol compile command:

https://doc.comsol.com/6.1/docserver/#!search/jdkroot.

We will look into making this task easier to do in a future COMSOL version.

Best regards,

Magnus

Hi, You can do this, but not without specifying a JDK root such as in this example: `comsol compile -jdkroot /src/java/OpenJDK-8u265/glnxa64/jdk A.java B.java` See the COMSOL documentation for information about `-jdkroot` and other arguments to the `comsol compile` command: We will look into making this task easier to do in a future COMSOL version. Best regards, Magnus

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