Using JNI in C++, use own .jar in existing JVM or create new JVM

Question

I'm trying to crate an Matlab IMAQ adapter for a 3D camera using the Java API of this camera.

So I create a .dll for Matlab within I handle the connection to the camera. There are specific functions needed by Matlab within I would like to call the Java functions of the API to connect to the device and make image acquisition.

My problem is Matlab is already starting a JVM, so I can't directly start a JVM in the adaptor, because in this case I would try to run two JVMs in one process

So my question is, which one is the better way:

Creating a new process in the adaptor to start a new JVM which will load the used .jar file in the classpath.
Attach to the running JVM started by Matlab and load the .jar I need in the running JVM.

I am not familiar with Matlab. Could you maybe improve your question and explain your problem in a more generic way? — Rainer, Nov 07 '16 at 09:00
Matlab is just generating my problem by starting a JVM for it's own, so I can't start a JVM in my own .dll because it's running in the Matlab process. — A. R., Nov 07 '16 at 09:24

score 1 · Answer 1 · edited May 23 '17 at 12:13

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First. Thanks for updating your question - makes now more sence to me.

I would rather attach to the running JVM. Maybe this could help you.

Attach to running JVM

Regards, Rainer

edited May 23 '17 at 12:13

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answered Nov 07 '16 at 11:55

Rainer

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Using JNI in C++, use own .jar in existing JVM or create new JVM

1 Answers1