Best way to throw exceptions in JNI code?

Question

I\'d like a consistent and simple way to throw exceptions in JNI code; something that handles chained exceptions (implicitly from the env->ExceptionOccurred method, or expli

Answer 1

I will put a more complete and general answer for who need a little bit more explanations like I need before.

First is nice to set your method with a Throw Exception so the IDE will ask for try/catch.

public native int func(Param1, Param2, Param3) throws IOException;

I decide for IOException over Exception because of this.

JNIEXPORT int JNICALL Java_YourClass_func
(int Param1, int Param2, int Param3) {
    if (Param3 == 0) { //something wrong
        jclass Exception = env->FindClass("java/lang/Exception");
        env->ThrowNew(Exception, "Can't divide by zero."); // Error Message
    }
    return (Param1+Param2)/Param3;
}