Java JNI LoadLibrary protected dll

Question

I created JNI export dll with visual c++ with one simple function. it work correctly when i use it in my java code with LoadLibrary method.

but when i use Unikey Enveloper and protected this dll it not work in java and this error appear

Invalid access to memory location

when i test this protected dll with visual c++ console application it work correctly.

how can I use protected dll in java LoadLibrary Method?

Visual C++ Code:

extern "C" {

    JNIEXPORT jint JNICALL Java_Bikaran_Start_JniTestFunction(JNIEnv *env, jclass c, jint a, jint b)
    {
        return a + b;
    }
}

JAVA Code :

 package Bikaran;

    public class Start {

        public static native int JniTestFunction(int s, int s1);

        public static void main(String[] args) {

            System.loadLibrary("...");

            System.out.println(JniTestFunction(1,2));
        }
    }