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Editorial Team
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Asked: 2026-06-14T10:26:00+00:00

I have an executable JAR which runs in the command line. I would like

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I have an executable JAR which runs in the command line. I would like to create a GUI for this program using VC++ for windows. Is there any way to ‘hook into’ the Java thread from the native C++, or launch the JAR from within the C++ thread? I have looked at the JNI, but it appears that the Java needs to be written to take this functionality into account. At the moment, I do not have the capability to modify the pre-compiled JAR. Is what I’m trying to do even possible?

Thanks in advance for any advice you can give.

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1 Answer

  1. Editorial Team

    The java only needs to be written with JNI functionality if you want to call C++ from Java. If you want to call Java from C++ it will work fine without any changes to the JAR. If you look at the source code to java.exe you can see an example of this.

    Look at around lines 540-610 in the java.exe source code

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