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javajava-native-interfacejava-11java-platform-module-systemjnienv

How to use JNI_CreateJavaVM to run modular java app

I'm porting our native windows app launcher from Java 8 to Java 11. We used to call JNI_CreateJavaVM method to instantiate a JVM instance, find main class and call its main method. With a modular app, env->FindClass doesn't return our app class. I tried calling Class.forName and it doesn't return a class instance as well.

Also, JNI_CreateJavaVM complaints about --add-modules argument.

How should we specify modules to load for the JNI api?

What can I do to find the app class from the native part?

Solution

  • I was able to run a Java app using JLI api instead. I used this code to invoke JLI api: https://github.com/MovingBlocks/TerasologyJavaLauncher/blob/master/jli_library_win.cpp

    It seems that a hack with app hooks isn't necessary anymore. I tried with JDK 11.0.2 and it worked correctly "as-is" without hacking jli.dll path.